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• Why aren't Java's generics implicitly polymorphic?

  - by froadie

  I'm a bit confused about how Java generics handle inheritance / polymorphism. Assume the following hierarchy - Animal (Parent) Dog - Cat (Children) So suppose I have a method doSomething(List<Animal> animals). By all the rules of inheritance and polymorphism, I would assume that a List<Dog> is a List<Animal> and a List<Cat> is a List<Animal> - and so either one could be passed to this method. Not so. If I want to achieve this behavior, I have to explicitly tell the method to accept a list of any subset of Animal by saying doSomething(List<? extends Animal> animals). I understand that this is Java's behavior. My question is why? Why is polymorphism generally implicit, but when it comes to generics it must be specified?

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• How to import .class file in a .java file?

  - by Namratha

  Hi, What i need to do is as follows: I have a bigloo scheme program (*.scm), then using the bigloo frameworks jvm a class file is generated. I want to use this .class file from a .java file. That is, i need to import this(.class) file as i want to use some functions defined in the scheme file which is now a .class file. How do i do it in Eclipse? i have created two packages one for java and one for the .class file. Then i import the package containing the .class file. But i am not able to use the function in the .class file in the .java file. Are there any settings to be done? Please let me know how this can be done.

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• What is the right way to implement communication between java objects?

  - by imoschak

  I'm working on an academic project which simulates a rather large queuing procedure in java. The core of the simulator rests within one package where there exist 8 classes, each one implementing a single concept. Every class in the project follows SRP. These classes encapsulate the behavior of the simulator and inter-connect every other class in the project. The problem that has arisen is that most of these 8 classes are, as is logical i think, tightly coupled and each one has to have working knowledge of every other class in this package in order to be able to call methods from it when needed. The application needs only one instance of each class so it might be better to create static fields for each class in a new class and use that to make calls -instead of preserving a reference in each class for every other class in the package (which I'm certain that is incorrect)-, but is this considered a correct design solution? or is there a design pattern maybe that better suits my needs?

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• how to do sorting using java

  - by karthikacyr

  hi friends, I have text file with list of alphabets and numbers. I want to do sorting w.r.t this number using java. My text file looks like this: a---12347 g---65784 r---675 I read the text file and i split it now. But i dont know how to perform sorting . I am new to java. Please give me a idea. My output want to be g---65784 a---12347 r---675 Plese help me. Thanks in advance. My coding is String str = ""; BufferedReader br = new BufferedReader(new FileReader("counts.txt")); while ((str = br.readLine()) != null) { String[] get = str.split("----"); When i search the internet all suggest in the type of arrays. I tried. But no use.How to inlude the get[1] into array. int arr[]=new int[50] arr[i]=get[1]; for(int i=0;i<50000;i++){ for(int j=i+1;j<60000;j++){ if(arr[i]arr[j]){ System.out.println(arr[i]); } }

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• Why is String or string a selaed class in C# or a final class in Java ?

  - by Dran Dane

  Why this limitation ? Is there a good reason ?

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• changing the intensity of lighten/darken on bitmaps using PorterDuffXfermode in the Android Paint class

  - by user1116836

  Ok my orignal question has changed. How do i change the intensity of how something like this is effected? DayToNight.setXfermode(new PorterDuffXfermode(Mode.DST_IN)); in my dream world it would have worked like this DayToNight.setXfermode(new PorterDuffXfermode(Mode.DST_IN(10))); the 10 being a level of intensity. An example would be if I had a flickering candle, when the candle burns bright I want the bitmaps I am drawing to the screen to retain their origanol color and brightness, when it flickers I want the bitmaps to be almost blacked out, and I want to darken the Bitmaps as the light dims. I have equations, timers and all that figured out, just not how to actually apply it to change the color/brightness. Maybe burning the images is what im looking for? I just want to change the lightness lol. I feel like using paint.setShader might be a solution, but the information in this area is pretty limited from what i have been able to find. Any help would be appreciated. edit: to be crystal clear, i am looking for a way to lighten/darken bitmaps as I draw them to the canvas

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• How do I "valueOf" an enum given a class name?

  - by stevemac

  Lets say I have a simple Enum called Animal defined as: public enum Animal { CAT, DOG } and I have a method like: private static Object valueOf(String value, Class<?> classType) { if (classType == String.class) { return value; } if (classType == Integer.class) { return Integer.parseInt(value); } if (classType == Long.class) { return Long.parseLong(value); } if (classType == Boolean.class) { return Boolean.parseBoolean(value); } // Enum resolution here } What can I put inside this method to return an instance of my enum where the value is of the classType? I have looked at trying: if (classType == Enum.class) { return Enum.valueOf((Class<Enum>)classType, value); } But that doesn't work.

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• Pointer-like behavior in Java

  - by Shmoo

  I got the following: class A{ int foo; } class B extends A{ public void bar(); } I got a instance of A and want to convert it to an instance of B without losing the reference to the variable foo. For example: A a = new A(); a.foo = 2; B b = a; <-- what I want to do. //use b b.foo = 3; //a.foo should now be 3 Thanks for any help!

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• Dont understand the concept of extends in URL.openConnection() in JAVA

  - by user1722361

  Hi I am trying to learn JAVA deeply and so I am digging into the JDK source code in the following lines: URL url = new URL("http://www.google.com"); URLConnection tmpConn = url.openConnection(); I attached the source code and set the breakpoint at the second line and stepped into the code. I can see the code flow is: URL.openConnection() - sun.net.www.protocol.http.Handler.openConnection() I have two questions about this First In URL.openConnection() the code is: public URLConnection openConnection() throws java.io.IOException { return handler.openConnection(this); } handler is an object of URLStreamHandler, define as blow transient URLStreamHandler handler; But URLStreamHandler is a abstract class and method openConnection() is not implement in it so when handler calls this method, it should go to find a subclass who implement this method, right? But there are a lot classes who implement this methods in sun.net.www.protocol (like http.Hanlder, ftp.Handler ) How should the code know which "openConnection" method it should call? In this example, this handler.openConnection() will go into http.Handler and it is correct. (if I set the url as ftp://www.google.com, it will go into ftp.Handler) I cannot understand the mechanism. second. I have attached the source code so I can step into the JDK and see the variables but for many classes like sun.net.www.protocol.http.Handler, there are not source code in src.zip. I googled this class and there is source code online I can get but why they did not put it (and many other classes) in the src.zip? Where can I find a comprehensive version of source code? Thanks!

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• Java Daemon Threading with JNI

  - by gwin003

  I have a Java applet that creates a new non-daemon thread like so: Thread childThread = new Thread(new MyRunnable(_this)); childThread.setDaemon(false); childThread.start(); Then my MyRunnable object calls a native method that is implemented in C++: @Override public void run() { while (true) { if (!ran) { System.out.println("isDaemon: " + Thread.currentThread().isDaemon()); _applet.invokePrintManager(_applet.fFormType, _applet.fFormName, _applet.fPrintImmediately, _applet.fDataSet); ran = true; } } } This C++ method calls into a C# DLL that shows a form. My problem is, whenever the user navigates away from the page with a Java applet on it, JVM (and my C# form) is killed. I need the form and JVM to remain open until it is closed by the user. I tried setting my thread to be a non-daemon thread, which is working because System.out.println("isDaemon: " + Thread.currentThread().isDaemon() prints isDaemon: false. Is there something related to the way that the C# form is created (is there another thread I'm not accounting for) or something I am overlooking?? My thread is not a daemon thread, but the JVM is being killed anyways.

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• Java: Incompatible Types

  - by user2922081

  import java.text.*; import java.util.*; public class Proj3 { public static void main(String[]args){ // DecimalFormat df = new DecimalFormat("#0.00”); Scanner s = new Scanner(System.in); int TotalHours = 0; int TotalGrade = 0; System.out.print("How many courses did you take? "); int Courses = Integer.parseInt(s.nextLine()); System.out.println(""); int CourseNumber = Courses - (Courses - 1); while (Courses > 0){ System.out.print("Course (" + CourseNumber +"): How many hours? "); int Hours = Integer.parseInt(s.nextLine()); TotalHours = TotalHours + Hours; System.out.print("Course (" + CourseNumber +"): Letter grade? "); char Grade = s.nextLine().charAt(0); if (Grade == 'A'){ TotalGrade = TotalGrade + (4 * Hours); } if (Grade == 'B'){ TotalGrade = TotalGrade + (3 * Hours); } if (Grade == 'C'){ TotalGrade = TotalGrade + (2 * Hours); } if (Grade == 'D'){ TotalGrade = TotalGrade + (1 * Hours); } Courses = Courses - 1; CourseNumber = CourseNumber + 1; } Double GPA = TotalGrade / TotalHours; System.out.println(df.format(GPA)); } } This is for an assignment and I don't know how to fix my problem. The Double GPA = TotalGrade / ToutalHours; line is coming up with the Incompatible Types error. Also I'm supposed to include the DecimalFormat df = new DecimalFormat("#0.00”);line at the beginning of the main but its not working. Anything is very helpful. Thanks

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• Eclipc java,writting a program [closed]

  - by ghassar

  I have an important exercise for that i found in the internet please i need help in using eclipc java thanks i have to design, implement, test and document a Java program (a set of classes) for one of the following problem specifications: Problem 1 – Jubilee Estate Agency Property Management System A local Estate Agent would like a prototype system to keep track of properties that are offered for sale. The Estate Agent sells domestic and commercial properties. You will need to define classes that represent the Estate Agency System. You should design your system and the classes that you will need before starting coding. Your system must have a graphical user interface and be designed and developed using the object-oriented principles of the MVC architecture design pattern i.e. the user interface class must be separate from the other classes. The initial basic requirements for the system are as follows: • Include a list of domestic properties for sale that include details of: address, description, selling price, and number of rooms • Include a list of commercial properties for sale that include details of: address, description, selling price, and area in square metres • Enable the properties that are for sale to be viewed on the screen • Allow the customer to select one or more properties to be placed on a ‘viewing list’ so that the properties can be visited in person • Display on the screen the viewing list that shows the details of the properties chosen • Provide a basic search facility to find properties that are for sale in a particular price band and display the results • Enable a property to be marked as sold

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• Defining Proper Classes with Java

  - by user2579706

  Ok, I'm studying Java and have the following question: "Assume you defined a class named MyClass. A student wants to use your class and tries to declare an instance named myObj and instantiate it. He tried the following: MyObj MyClass = new MyClass( ); Why won't his code work? Show how he should correct it. " I'm not sure how to do this? Can anyone point me in the right direction? Many thanks.

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• how to generate XML (in String representation) in java

  - by flyingfromchina

  I have defined a java class, but only need to output some of the fields of this class into an XML. The returned type must be a String. I first opted for the easiest way using a StringBuffer. However, when I tried to process the output String represenation, it failed. I think it is mostly likely because there are some characters that are not encoded in the UTF-8 in the input. Could someone tell me what is the best way to handle this? Thanks.

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• Selenium server won't start

  - by moff

  I'm getting the following error when trying to start selenium: C:\Temp\selenium-server-1.0.3java -jar selenium-server.jar 22:02:07.615 INFO - Java: Sun Microsystems Inc. 16.0-b13 22:02:07.617 INFO - OS: Windows 7 6.1 x86 22:02:07.625 INFO - v2.0 [a2], with Core v2.0 [a2] 22:02:07.811 INFO - RemoteWebDriver instances should connect to: http://127.0.0. 1:4444/wd/hub 22:02:07.813 INFO - Version Jetty/5.1.x 22:02:07.815 INFO - Started HttpContext[/selenium-server/driver,/selenium-server /driver] 22:02:07.817 INFO - Started HttpContext[/selenium-server,/selenium-server] 22:02:07.818 INFO - Started HttpContext[/,/] 22:02:07.866 INFO - Started org.openqa.jetty.jetty.servlet.ServletHandler@2bbd86 22:02:07.867 INFO - Started HttpContext[/wd,/wd] 22:02:07.870 WARN - Failed to start: [email protected]:4444 Exception in thread "main" org.openqa.jetty.util.MultiException[java.net.SocketE xception: Unrecognized Windows Sockets error: 0: JVM_Bind] at org.openqa.jetty.http.HttpServer.doStart(HttpServer.java:686) at org.openqa.jetty.util.Container.start(Container.java:72) at org.openqa.selenium.server.SeleniumServer.start(SeleniumServer.java:3 96) at org.openqa.selenium.server.SeleniumServer.boot(SeleniumServer.java:23 4) at org.openqa.selenium.server.SeleniumServer.main(SeleniumServer.java:19 8) java.net.SocketException: Unrecognized Windows Sockets error: 0: JVM_Bind at java.net.PlainSocketImpl.socketBind(Native Method) at java.net.PlainSocketImpl.bind(Unknown Source) at java.net.ServerSocket.bind(Unknown Source) at java.net.ServerSocket.(Unknown Source) at org.openqa.jetty.util.ThreadedServer.newServerSocket(ThreadedServer.j ava:391) at org.openqa.jetty.util.ThreadedServer.open(ThreadedServer.java:477) at org.openqa.jetty.util.ThreadedServer.start(ThreadedServer.java:503) at org.openqa.jetty.http.SocketListener.start(SocketListener.java:204) at org.openqa.jetty.http.HttpServer.doStart(HttpServer.java:716) at org.openqa.jetty.util.Container.start(Container.java:72) at org.openqa.selenium.server.SeleniumServer.start(SeleniumServer.java:3 96) at org.openqa.selenium.server.SeleniumServer.boot(SeleniumServer.java:23 4) at org.openqa.selenium.server.SeleniumServer.main(SeleniumServer.java:19 8) Java is installed: C:\Temp\selenium-server-1.0.3java -version java version "1.6.0_18" Java(TM) SE Runtime Environment (build 1.6.0_18-b07) Java HotSpot(TM) Client VM (build 16.0-b13, mixed mode, sharing) Thanks in advance

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• Java Cloud Service Integration using Web Service Data Control

  - by Jani Rautiainen

  Java Cloud Service (JCS) provides a platform to develop and deploy business applications in the cloud. In Fusion Applications Cloud deployments customers do not have the option to deploy custom applications developed with JDeveloper to ensure the integrity and supportability of the hosted application service. Instead the custom applications can be deployed to the JCS and integrated to the Fusion Application Cloud instance.This series of articles will go through the features of JCS, provide end-to-end examples on how to develop and deploy applications on JCS and how to integrate them with the Fusion Applications instance.In this article a custom application integrating with Fusion Application using Web Service Data Control will be implemented. v\:* {behavior:url(#default#VML);} o\:* {behavior:url(#default#VML);} w\:* {behavior:url(#default#VML);} .shape {behavior:url(#default#VML);} Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Calibri","sans-serif";} Pre-requisites Access to Cloud instance In order to deploy the application access to a JCS instance is needed, a free trial JCS instance can be obtained from Oracle Cloud site. To register you will need a credit card even if the credit card will not be charged. To register simply click "Try it" and choose the "Java" option. The confirmation email will contain the connection details. See this video for example of the registration. Once the request is processed you will be assigned 2 service instances; Java and Database. Applications deployed to the JCS must use Oracle Database Cloud Service as their underlying database. So when JCS instance is created a database instance is associated with it using a JDBC data source. The cloud services can be monitored and managed through the web UI. For details refer to Getting Started with Oracle Cloud. JDeveloper JDeveloper contains Cloud specific features related to e.g. connection and deployment. To use these features download the JDeveloper from JDeveloper download site by clicking the “Download JDeveloper 11.1.1.7.1 for ADF deployment on Oracle Cloud” link, this version of JDeveloper will have the JCS integration features that will be used in this article. For versions that do not include the Cloud integration features the Oracle Java Cloud Service SDK or the JCS Java Console can be used for deployment. For details on installing and configuring the JDeveloper refer to the installation guide. For details on SDK refer to Using the Command-Line Interface to Monitor Oracle Java Cloud Service and Using the Command-Line Interface to Manage Oracle Java Cloud Service. Create Application In this example the “JcsWsDemo” application created in the “Java Cloud Service Integration using Web Service Proxy” article is used as the base. Create Web Service Data Control In this example we will use a Web Service Data Control to integrate with Credit Rule Service in Fusion Applications. The data control will be used to query data from Fusion Applications using a web service call and present the data in a table. To generate the data control choose the “Model” project and navigate to "New -> All Technologies -> Business Tier -> Data Controls -> Web Service Data Control" and enter following: Name: CreditRuleServiceDC URL: https://ic-[POD].oracleoutsourcing.com/icCnSetupCreditRulesPublicService/CreditRuleService?WSDL Service: {{http://xmlns.oracle.com/apps/incentiveCompensation/cn/creditSetup/creditRule/creditRuleService/}CreditRuleService On step 2 select the “findRule” operation: Skip step 3 and on step 4 define the credentials to access the service. Do note that in this example these credentials are only used if testing locally, for JCS deployment credentials need to be manually updated on the EAR file: Click “Finish” and the proxy generation is done. Creating UI In order to use the data control we will need to populate complex objects FindCriteria and FindControl. For simplicity in this example we will create logic in a managed bean that populates the objects. Open “JcsWsDemoBean.java” and add the following logic: Map findCriteria; Map findControl; public void setFindCriteria(Map findCriteria) { this.findCriteria = findCriteria; } public Map getFindCriteria() { findCriteria = new HashMap(); findCriteria.put("fetchSize",10); findCriteria.put("fetchStart",0); return findCriteria; } public void setFindControl(Map findControl) { this.findControl = findControl; } public Map getFindControl() { findControl = new HashMap(); return findControl; } Open “JcsWsDemo.jspx”, navigate to “Data Controls -> CreditRuleServiceDC -> findRule(Object, Object) -> result” and drag and drop the “result” node into the “af:form” element in the page: On the “Edit Table Columns” remove all columns except “RuleId” and “Name”: On the “Edit Action Binding” window displayed enter reference to the java class created above by selecting “#{JcsWsDemoBean.findCriteria}”: Also define the value for the “findControl” by selecting “#{JcsWsDemoBean.findControl}”. Deploy to JCS For WS DC the authentication details need to be updated on the connection details before deploying. Open “connections.xml” by navigating “Application Resources -> Descriptors -> ADF META-INF -> connections.xml”: Change the user name and password entry from: <soap username="transportUserName" password="transportPassword" To match the access details for the target environment. Follow the same steps as documented in previous article ”Java Cloud Service ADF Web Application”. Once deployed the application can be accessed with URL: https://java-[identity domain].java.[data center].oraclecloudapps.com/JcsWsDemo-ViewController-context-root/faces/JcsWsDemo.jspx When accessed the first 10 rules in the system are displayed: Summary In this article we learned how to integrate with Fusion Applications using a Web Service Data Control in JCS. In future articles various other integration techniques will be covered. Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Calibri","sans-serif";}

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• Failed to resolve artifact. Missing: ---------- 1) org.codehaus.mojo:gwt-maven-plugin:jar:1.3-SNAPSHOT

  - by karim

  i want to use the addon vaadin Timeline, so i have to make "gwt-maven-plugin 3.1" as i know ,my pom.xml is the following : <?xml version="1.0"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>life</groupId> <artifactId>life</artifactId> <packaging>war</packaging> <name>life Portlet</name> <version>0.0.1-SNAPSHOT</version> <url>http://maven.apache.org</url> <properties> <vaadin-widgets-dir>src/main/webapp/VAADIN/widgetsets</vaadin-widgets-dir> </properties> <build> <plugins> <plugin> <groupId>com.liferay.maven.plugins</groupId> <artifactId>liferay-maven-plugin</artifactId> <version>6.1.0</version> <configuration> <autoDeployDir>${liferay.auto.deploy.dir}</autoDeployDir> <liferayVersion>6.1.0</liferayVersion> <pluginType>portlet</pluginType> </configuration> </plugin> <plugin> <artifactId>maven-compiler-plugin</artifactId> <configuration> <encoding>UTF-8</encoding> <source>1.5</source> <target>1.5</target> </configuration> </plugin> <plugin> <groupId>com.vaadin</groupId> <artifactId>vaadin-maven-plugin</artifactId> <version>1.0.1</version> </plugin> <!-- Compiles your custom GWT components with the GWT compiler --> <plugin> <groupId>org.codehaus.mojo</groupId> <artifactId>gwt-maven-plugin</artifactId> <version>2.1.0-1</version> <configuration> <!-- if you don't specify any modules, the plugin will find them --> <!--modules> .. </modules --> <webappDirectory>${project.build.directory}/${project.build.finalName}/VAADIN/widgetsets</webappDirectory> <extraJvmArgs>-Xmx512M -Xss1024k</extraJvmArgs> <runTarget>clean</runTarget> <hostedWebapp>${project.build.directory}/${project.build.finalName}</hostedWebapp> <noServer>true</noServer> <port>8080</port> <soyc>false</soyc> </configuration> <executions> <execution> <goals> <goal>resources</goal> <goal>compile</goal> </goals> </execution> </executions> </plugin> <!-- Updates Vaadin 6.2+ widgetset definitions based on project dependencies --> <plugin> <groupId>com.vaadin</groupId> <artifactId>vaadin-maven-plugin</artifactId> <version>1.0.1</version> <executions> <execution> <configuration> <!-- if you don't specify any modules, the plugin will find them --> <!-- <modules> <module>${package}.gwt.MyWidgetSet</module> </modules> --> </configuration> <goals> <goal>update-widgetset</goal> </goals> </execution> </executions> </plugin> </plugins> <pluginManagement> <plugins> <!--This plugin's configuration is used to store Eclipse m2e settings only. It has no influence on the Maven build itself. --> <plugin> <groupId>org.eclipse.m2e</groupId> <artifactId>lifecycle-mapping</artifactId> <version>1.0.0</version> <configuration> <lifecycleMappingMetadata> <pluginExecutions> <pluginExecution> <pluginExecutionFilter> <groupId> org.codehaus.mojo </groupId> <artifactId> gwt-maven-plugin </artifactId> <versionRange> [2.1.0-1,) </versionRange> <goals> <goal>resources</goal> </goals> </pluginExecutionFilter> <action> <ignore></ignore> </action> </pluginExecution> <pluginExecution> <pluginExecutionFilter> <groupId>com.vaadin</groupId> <artifactId> vaadin-maven-plugin </artifactId> <versionRange> [1.0.1,) </versionRange> <goals> <goal> update-widgetset </goal> </goals> </pluginExecutionFilter> <action> <ignore></ignore> </action> </pluginExecution> </pluginExecutions> </lifecycleMappingMetadata> </configuration> </plugin> </plugins> </pluginManagement> </build> <dependencies> <dependency> <groupId>com.liferay.portal</groupId> <artifactId>portal-service</artifactId> <version>6.1.0</version> <scope>provided</scope> </dependency> <dependency> <groupId>com.liferay.portal</groupId> <artifactId>util-bridges</artifactId> <version>6.1.0</version> <scope>provided</scope> </dependency> <dependency> <groupId>org.vaadin.addons</groupId> <artifactId>vaadin-timeline-agpl-3.0</artifactId> <version>1.2.4</version> </dependency> <dependency> <groupId>com.liferay.portal</groupId> <artifactId>util-taglib</artifactId> <version>6.1.0</version> <scope>provided</scope> </dependency> <dependency> <groupId>com.liferay.portal</groupId> <artifactId>util-java</artifactId> <version>6.1.0</version> <scope>provided</scope> </dependency> <dependency> <groupId>javax.portlet</groupId> <artifactId>portlet-api</artifactId> <version>2.0</version> <scope>provided</scope> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>servlet-api</artifactId> <version>2.4</version> <scope>provided</scope> </dependency> <dependency> <groupId>javax.servlet.jsp</groupId> <artifactId>jsp-api</artifactId> <version>2.0</version> <scope>provided</scope> </dependency> <!-- sqx --> <dependency> <groupId>javax.activation</groupId> <artifactId>activation</artifactId> <version>1.1.1</version> <scope>provided</scope> </dependency> <dependency> <groupId>antlr</groupId> <artifactId>antlr</artifactId> <version>2.7.6</version> <scope>provided</scope> </dependency> <dependency> <groupId>aopalliance</groupId> <artifactId>aopalliance</artifactId> <version>1.0</version> <scope>provided</scope> </dependency> <dependency> <groupId>asm</groupId> <artifactId>asm</artifactId> <version>1.5.3</version> <scope>provided</scope> </dependency> <dependency> <groupId>asm</groupId> <artifactId>asm-attrs</artifactId> <version>1.5.3</version> <scope>provided</scope> </dependency> <dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjrt</artifactId> <version>1.6.8</version> <scope>provided</scope> </dependency> <dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjweaver</artifactId> <version>1.6.8</version> <scope>provided</scope> </dependency> <dependency> <groupId>bsh</groupId> <artifactId>bsh</artifactId> <version>1.3.0</version> <scope>provided</scope> </dependency> <dependency> <groupId>cglib</groupId> <artifactId>cglib</artifactId> <version>2.1_3</version> <scope>provided</scope> </dependency> <dependency> <groupId>commons-collections</groupId> <artifactId>commons-collections</artifactId> <version>3.1</version> <scope>provided</scope> </dependency> <dependency> <groupId>commons-dbcp</groupId> <artifactId>commons-dbcp</artifactId> <version>1.3</version> </dependency> <dependency> <groupId>commons-logging</groupId> <artifactId>commons-logging</artifactId> <version>1.1</version> </dependency> <dependency> <groupId>commons-pool</groupId> <artifactId>commons-pool</artifactId> <version>1.5.3</version> </dependency> <dependency> <groupId>dom4j</groupId> <artifactId>dom4j</artifactId> <version>1.6.1</version> </dependency> <dependency> <groupId>net.sf.ehcache</groupId> <artifactId>ehcache</artifactId> <version>1.2.3</version> </dependency> <dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate-core</artifactId> <version>3.3.1.GA</version> </dependency> <dependency> <groupId>hsqldb</groupId> <artifactId>hsqldb</artifactId> <version>1.8.0.10</version> </dependency> <!-- <dependency> <groupId>jboss</groupId> <artifactId>jboss-backport-concurrent</artifactId> <version>2.1.0.GA</version> </dependency> --> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-parent</artifactId> <version>1.5.0</version> </dependency> <dependency> <groupId>javax.jcr</groupId> <artifactId>jcr</artifactId> <version>1.0</version> </dependency> <!-- <dependency> <groupId>javax.sql</groupId> <artifactId>jdbc-stdext</artifactId> <version>2.0</version> </dependency> --> <dependency> <groupId>jdom</groupId> <artifactId>jdom</artifactId> <version>1.0</version> </dependency> <dependency> <groupId>javax.transaction</groupId> <artifactId>jta</artifactId> <version>1.1</version> </dependency> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>1.2.14</version> </dependency> <dependency> <groupId>javax.mail</groupId> <artifactId>mail</artifactId> <version>1.4.3</version> </dependency> <dependency> <groupId>com.sun.portal.portletcontainer</groupId> <artifactId>container</artifactId> <version>1.1-m4</version> </dependency> <dependency> <groupId>postgresql</groupId> <artifactId>postgresql</artifactId> <version>8.4-702.jdbc3</version> </dependency> <!-- sl4j-api-1.5.0 manquante --> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-parent</artifactId> <version>1.5.0</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> <version>1.5.0</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aop</artifactId> <version>2.5.6</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aspects</artifactId> <version>3.0.3.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-beans</artifactId> <version>2.5.6</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>2.5.6</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context-support</artifactId> <version>2.5.6</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>2.5.6</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>2.5.6</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jms</artifactId> <version>2.5.6</version> </dependency> <dependency> <groupId>javax.jms</groupId> <artifactId>jms</artifactId> <version>1.1</version> <scope>compile</scope> </dependency> <!-- <dependency> <groupId>org.springmodules</groupId> <artifactId>spring-modules-jbpm31</artifactId> <version>0.9</version> <scope>provided</scope> </dependency> --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-orm</artifactId> <version>2.5.6</version> </dependency> <dependency> <groupId>org.springframework.ws</groupId> <artifactId>spring-oxm</artifactId> <version>1.5.0</version> <scope>provided</scope> </dependency> <dependency> <groupId>org.springframework.security</groupId> <artifactId>spring-security-core</artifactId> <version>2.0.4</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-tx</artifactId> <version>2.5.6</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>2.5.6</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc-portlet</artifactId> <version>2.5</version> </dependency> <dependency> <groupId>com.atomikos</groupId> <artifactId>transactions-hibernate3</artifactId> <version>3.6.4</version> </dependency> <dependency> <groupId>com.atomikos</groupId> <artifactId>transactions-osgi</artifactId> <version>3.7.0</version> </dependency> <dependency> <groupId>com.vaadin</groupId> <artifactId>vaadin</artifactId> <version>6.7.0</version> </dependency> <dependency> <groupId>com.thoughtworks.xstream</groupId> <artifactId>xstream</artifactId> <version>1.3.1</version> </dependency> <!-- this is the dependency to the "jar"-subproject --> <dependency> <groupId>org.codehaus.plexus</groupId> <artifactId>plexus-utils</artifactId> <version>1.5.9</version> </dependency> <dependency> <groupId>com.google.gwt</groupId> <artifactId>gwt-user</artifactId> <version>2.1.1</version> <scope>provided</scope> </dependency> </dependencies> <!-- Define our plugin repositories --> <pluginRepositories> <pluginRepository> <id>Codehaus</id> <name>Codehaus Maven Plugin Repository</name> <url>http://repository.codehaus.org/org/codehaus/mojo</url> <snapshots> <enabled>true</enabled> </snapshots> </pluginRepository> <pluginRepository> <id>codehaus-snapshots</id> <url>[http://nexus.codehaus.org/snapshots]</url> <snapshots> <enabled>true</enabled> </snapshots> <releases> <enabled>false</enabled> </releases> </pluginRepository> </pluginRepositories> <repositories> <repository> <id>vaadin-addons</id> <url>http://maven.vaadin.com/vaadin-addons</url> </repository> <repository> <id>demoiselle.sourceforge.net</id> <name>Demoiselle Maven Repository</name> <url>http://demoiselle.sourceforge.net/repository/release</url> </repository> </repositories> AND when i do "clean install" to build my mvn , the console show me this taken : [INFO] Unable to find resource 'org.codehaus.mojo:gwt-maven-plugin:jar:1.3-SNAPSHOT' in repository demoiselle.sourceforge.net (http://demoiselle.sourceforge.net/repository/release) [INFO] ------------------------------------------------------------------------ [ERROR] BUILD ERROR [INFO] ------------------------------------------------------------------------ [INFO] Failed to resolve artifact. Missing: ---------- 1) org.codehaus.mojo:gwt-maven-plugin:jar:1.3-SNAPSHOT Try downloading the file manually from the project website. Then, install it using the command: mvn install:install-file -DgroupId=org.codehaus.mojo -DartifactId=gwt-maven-plugin - Dversion=1.3-SNAPSHOT -Dpackaging=jar -Dfile=/path/to/file Alternatively, if you host your own repository you can deploy the file there: mvn deploy:deploy-file -DgroupId=org.codehaus.mojo -DartifactId=gwt-maven-plugin -Dversion=1.3-SNAPSHOT -Dpackaging=jar -Dfile=/path/to/file -Durl=[url] -DrepositoryId=[id] Path to dependency: 1) com.vaadin:vaadin-maven-plugin:maven-plugin:1.0.1 2) org.codehaus.mojo:gwt-maven-plugin:jar:1.3-SNAPSHOT ---------- 1 required artifact is missing. for artifact: com.vaadin:vaadin-maven-plugin:maven-plugin:1.0.1 from the specified remote repositories: demoiselle.sourceforge.net (http://demoiselle.sourceforge.net/repository/release), central (http://repo1.maven.org/maven2), Codehaus (http://repository.codehaus.org/org/codehaus/mojo), codehaus-snapshots ([http://nexus.codehaus.org/snapshots]), vaadin-snapshots (http://oss.sonatype.org/content/repositories/vaadin-snapshots/), vaadin-releases (http://oss.sonatype.org/content/repositories/vaadin-releases/), vaadin-addons (http://maven.vaadin.com/vaadin-addons) your help will be welcome thank you a lot !!! :)))

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• Techniques for modeling a dynamic dataflow with Java concurrency API

  - by Maian

  Is there an elegant way to model a dynamic dataflow in Java? By dataflow, I mean there are various types of tasks, and these tasks can be "connected" arbitrarily, such that when a task finishes, successor tasks are executed in parallel using the finished tasks output as input, or when multiple tasks finish, their output is aggregated in a successor task (see flow-based programming). By dynamic, I mean that the type and number of successors tasks when a task finishes depends on the output of that finished task, so for example, task A may spawn task B if it has a certain output, but may spawn task C if has a different output. Another way of putting it is that each task (or set of tasks) is responsible for determining what the next tasks are. Sample dataflow for rendering a webpage: I have as task types: file downloader, HTML/CSS renderer, HTML parser/DOM builder, image renderer, JavaScript parser, JavaScript interpreter. File downloader task for HTML file HTML parser/DOM builder task File downloader task for each embedded file/link If image, image renderer If external JavaScript, JavaScript parser JavaScript interpreter Otherwise, just store in some var/field in HTML parser task JavaScript parser for each embedded script JavaScript interpreter Wait for above tasks to finish, then HTML/CSS renderer (obviously not optimal or perfectly correct, but this is simple) I'm not saying the solution needs to be some comprehensive framework (in fact, the closer to the JDK API, the better), and I absolutely don't want something as heavyweight is say Spring Web Flow or some declarative markup or other DSL. To be more specific, I'm trying to think of a good way to model this in Java with Callables, Executors, ExecutorCompletionServices, and perhaps various synchronizer classes (like Semaphore or CountDownLatch). There are a couple use cases and requirements: Don't make any assumptions on what executor(s) the tasks will run on. In fact, to simplify, just assume there's only one executor. It can be a fixed thread pool executor, so a naive implementation can result in deadlocks (e.g. imagine a task that submits another task and then blocks until that subtask is finished, and now imagine several of these tasks using up all the threads). To simplify, assume that the data is not streamed between tasks (task output-succeeding task input) - the finishing task and succeeding task won't exist together, so the input data to the succeeding task will not be changed by the preceeding task (since it's already done). There are only a couple operations that the dataflow "engine" should be able to handle: A mechanism where a task can queue more tasks A mechanism whereby a successor task is not queued until all the required input tasks are finished A mechanism whereby the main thread (or other threads not managed by the executor) blocks until the flow is finished A mechanism whereby the main thread (or other threads not managed by the executor) blocks until certain tasks have finished Since the dataflow is dynamic (depends on input/state of the task), the activation of these mechanisms should occur within the task code, e.g. the code in a Callable is itself responsible for queueing more Callables. The dataflow "internals" should not be exposed to the tasks (Callables) themselves - only the operations listed above should be available to the task. Note that the type of the data is not necessarily the same for all tasks, e.g. a file download task may accept a File as input but will output a String. If a task throws an uncaught exception (indicating some fatal error requiring all dataflow processing to stop), it must propagate up to the thread that initiated the dataflow as quickly as possible and cancel all tasks (or something fancier like a fatal error handler). Tasks should be launched as soon as possible. This along with the previous requirement should preclude simple Future polling + Thread.sleep(). As a bonus, I would like to dataflow engine itself to perform some action (like logging) every time task is finished or when no has finished in X time since last task has finished. Something like: ExecutorCompletionService<T> ecs; while (hasTasks()) { Future<T> future = ecs.poll(1 minute); some_action_like_logging(); if (future != null) { future.get() ... } ... } Are there straightforward ways to do all this with Java concurrency API? Or if it's going to complex no matter what with what's available in the JDK, is there a lightweight library that satisfies the requirements? I already have a partial solution that fits my particular use case (it cheats in a way, since I'm using two executors, and just so you know, it's not related at all to the web browser example I gave above), but I'd like to see a more general purpose and elegant solution.

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• Error Creating RSS Feed XML file - Java

  - by GigaPr

  Hi, i am trying to create an RssFeed using java this is the class i use import com.rssFeed.domain.RSS; import com.rssFeed.domain.RSSItem; import java.io.FileOutputStream; import java.util.Iterator; import javax.xml.stream.XMLEventFactory; import javax.xml.stream.XMLEventWriter; import javax.xml.stream.XMLOutputFactory; import javax.xml.stream.XMLStreamException; import javax.xml.stream.events.Characters; import javax.xml.stream.events.EndElement; import javax.xml.stream.events.StartDocument; import javax.xml.stream.events.StartElement; import javax.xml.stream.events.XMLEvent; public class RssBuilder { private static String XML_BLOCK = "\n"; private static String XML_INDENT = "\t"; public static void BuildRss(RSS rss, String xmlfile) throws Exception { XMLOutputFactory output = XMLOutputFactory.newInstance(); XMLEventWriter writer = output.createXMLEventWriter(new FileOutputStream(xmlfile)); try { XMLEventFactory eventFactory = XMLEventFactory.newInstance(); XMLEvent endSection = eventFactory.createDTD(XML_BLOCK); StartDocument startDocument = eventFactory.createStartDocument(); writer.add(startDocument); writer.add(endSection); StartElement rssStart = eventFactory.createStartElement("", "", "rss"); writer.add(rssStart); writer.add(eventFactory.createAttribute("version", "2.0")); writer.add(endSection); writer.add(eventFactory.createStartElement("", "", "channel")); writer.add(endSection); createNode(writer, "title", rss.getTitle()); createNode(writer, "description", rss.getDescription()); createNode(writer, "link", rss.getLink()); createNode(writer, "dateCreated", rss.getDateCreated().toString()); createNode(writer, "language", rss.getLanguage()); createNode(writer, "pubDate", rss.getPubDate().toString()); createNode(writer, "dateModified", rss.getDateModified().toString()); createNode(writer, "dateModified", rss.getDateModified().toString()); createNode(writer, "pubDate", rss.getPubDate().toString()); createNode(writer, "lastBuildDate", rss.getLastBuildDate().toString()); createNode(writer, "language", rss.getLanguage().toString()); createNode(writer, "rating", rss.getRating().toString()); Iterator<RSSItem> iterator = rss.getRssItems().iterator(); while (iterator.hasNext()) { RSSItem entry = iterator.next(); writer.add(eventFactory.createStartElement("", "", "item")); writer.add(endSection); createNode(writer, "title", entry.getTitle()); createNode(writer, "description", entry.getDescription()); createNode(writer, "link", entry.getLink()); createNode(writer, "dateCreated", entry.getDateCreated().toString()); createNode(writer, "pubDate", entry.getDateModified().toString()); writer.add(eventFactory.createEndElement("", "", "item")); writer.add(endSection); } writer.add(endSection); writer.add(eventFactory.createEndElement("", "", "channel")); writer.add(endSection); writer.add(eventFactory.createEndElement("", "", "rss")); writer.add(endSection); writer.add(eventFactory.createEndDocument()); writer.close(); } catch(Exception e) { writer.close(); } } private static void createNode(XMLEventWriter eventWriter, String name, String value)throws XMLStreamException { XMLEventFactory eventFactory = XMLEventFactory.newInstance(); XMLEvent endSection = eventFactory.createDTD(XML_BLOCK); XMLEvent tabSection = eventFactory.createDTD(XML_INDENT); StartElement sElement = eventFactory.createStartElement("", "", name); eventWriter.add(tabSection); eventWriter.add(sElement); Characters characters = eventFactory.createCharacters(value); eventWriter.add(characters); EndElement eElement = eventFactory.createEndElement("", "", name); eventWriter.add(eElement); eventWriter.add(endSection); } } But i get the following error type Exception report message descriptionThe server encountered an internal error () that prevented it from fulfilling this request. exception org.springframework.web.util.NestedServletException: Request processing failed; nested exception is javax.xml.stream.XMLStreamException: Can not write DOCTYPE declaration (DTD) when not in prolog any more (state 2; start element(s) written) root cause javax.xml.stream.XMLStreamException: Can not write DOCTYPE declaration (DTD) when not in prolog any more (state 2; start element(s) written) what does it mean?

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• Multiple schema validation in Java

  - by user279554

  Hi, I am trying to do multiple schema validation in Java. I don't understand where I am doing wrong. Any help will be appreciated. abc.xsd <?xml version="1.0" encoding="UTF-8"?> <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xn="project-xml-r4j_another.xsd"> <xsd:import namespace="project-xml-r4j_another.xsd"/> <xsd:element name="abc" type="abc"> </xsd:element> <xsd:complexType name="abc"> <xsd:sequence> <xsd:element name="test" type="test" minOccurs="0" maxOccurs="1"> </xsd:element> <!--<xsd:element name="proj" type="xn:proj"/>--> </xsd:sequence> <xsd:attribute name="id" type="xsd:ID" use="required"/> </xsd:complexType> <xsd:complexType name="test"> <xsd:attribute name="id" type="xsd:ID" use="required"></xsd:attribute> <xsd:attribute name="value" use="required"> <xsd:simpleType> <xsd:restriction base="xsd:string"> <xsd:maxLength value="100" /> </xsd:restriction> </xsd:simpleType> </xsd:attribute> </xsd:complexType> </xsd:schema> project-xml-r4j_another.xsd <?xml version="1.0" encoding="UTF-8"?> <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" targetNamespace="project-xml-r4j_another.xsd" xmlns="project-xml-r4j_another.xsd" elementFormDefault="qualified" attributeFormDefault="unqualified"> <xsd:element name="proj" type="proj"> <xsd:annotation> <xsd:documentation> The project is the root tag of a project-xml. </xsd:documentation> </xsd:annotation> </xsd:element> <xsd:complexType name="proj"> <xsd:attribute name="id" type="xsd:ID" use="required"/> </xsd:complexType> </xsd:schema> Test case package test; import java.io.File; import java.io.IOException; import javax.xml.XMLConstants; import javax.xml.transform.Source; import javax.xml.transform.stream.StreamSource; import javax.xml.validation.Schema; import javax.xml.validation.SchemaFactory; import javax.xml.validation.Validator; import org.apache.log4j.Logger; import org.junit.Test; import org.xml.sax.SAXException; import org.xml.sax.SAXParseException; import org.xml.sax.helpers.DefaultHandler; import com.ericsson.ccrtool.core.project.projectxml.InvalidProjectXmlException; public class TestSchema { private static final Logger logger = Logger.getLogger(TestSchema.class); static final String W3C_XML_SCHEMA = XMLConstants.W3C_XML_SCHEMA_NS_URI; @Test public void test() { System.out.println("TestSchema.test()"); try { SchemaFactory schemaFactory = SchemaFactory.newInstance(W3C_XML_SCHEMA); // create a grammar object. Source [] source = { new StreamSource(new File("C:\\jaydeep\\Ericsson\\R5B\\abc.xsd")), new StreamSource(new File("C:\\jaydeep\\Ericsson\\R5B\\project-xml-r4j.xsd"))}; Schema schemaGrammar = schemaFactory.newSchema(source); Validator schemaValidator = schemaGrammar.newValidator(); schemaValidator.setErrorHandler(new MessageHandler()); // validate xml instance against the grammar. schemaValidator.validate(new StreamSource("C:\\jaydeep\\Ericsson\\R5B\\project_tmmk17cells_xnaveen_project-xml.xml")); } catch (SAXException e) { throw new InvalidProjectXmlException("Project-xml validation failed, Exception: " + e.getMessage(), e); } catch (IOException e) { throw new InvalidProjectXmlException("Project-xml validation failed, Exception: " + e.getMessage(), e); } } class MessageHandler extends DefaultHandler { private String errMessage = ""; @Override public void warning(SAXParseException e) { logger.info("Warning Line " + e.getLineNumber() + ": " + e.getMessage()); } @Override public void error(SAXParseException e) { errMessage = new String("Error Line " + e.getLineNumber() + ": " + e.getMessage()); logger.info(errMessage); throw new InvalidProjectXmlException("Project-xml validation failed, Exception: " + errMessage); } @Override public void fatalError(SAXParseException e) { errMessage = new String("Error Line " + e.getLineNumber() + ": " + e.getMessage()); logger.info(errMessage); throw new InvalidProjectXmlException("Project-xml validation failed, Exception: " + errMessage); } } } Thanks, Jaydeep

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• Set Icon in Button LWUIT Java ME

  - by Muhamad Burhanudin

  Please help me, to set icon button : /* * To change this template, choose Tools | Templates * and open the template in the editor. */ package tajwed; import javax.microedition.midlet.*; import com.sun.lwuit.*; import com.sun.lwuit.animations.*; import com.sun.lwuit.events.*; import com.sun.lwuit.layouts.BoxLayout; import com.sun.lwuit.plaf.*; import java.io.IOException; import java.util.Hashtable; /** * @author Muhamad BUrhanudin */ public class tajwedMidlet extends MIDlet implements ActionListener{ Form mHomeForm; Form mAwayForm; Form mMenuTajwid; Command mExitCommand; Button btMenu; Button btNunSukun, btMimSukun, btNunTasjid; Button btLamtarif, btIdgham, btMaad, btRaa; Button btHelp; Button btExit; Command mBackCommand; public void startApp() { Display.init(this); installTheme(); createUI(); mHomeForm.show(); } public void pauseApp() { } public void destroyApp(boolean unconditional) { } public void actionPerformed(ActionEvent ae) { mAwayForm.setTransitionInAnimator( Transition3D.createCube(400, false)); mMenuTajwid.setTransitionInAnimator( Transition3D.createCube(400, false)); mMenuTajwid.setTransitionOutAnimator( Transition3D.createCube(400, true)); mAwayForm.setTransitionOutAnimator( Transition3D.createCube(400, true)); if ((ae.getSource()==btMenu)|| (ae.getSource()==btHelp)) { //mAwayForm.show(); if(ae.getSource()== btMenu) { mMenuTajwid.show(); } } else if (ae.getSource() == mBackCommand) { mHomeForm.show(); } else if ((ae.getCommand() == mExitCommand) || (ae.getSource()== btExit)) notifyDestroyed(); } private void installTheme() { UIManager uim = UIManager.getInstance(); Hashtable ht = new Hashtable(); ht.put("sel#" + Style.BG_COLOR, "ffffff"); ht.put(Style.BG_COLOR, "d5fff9"); ht.put(Style.FG_COLOR, "000000"); uim.setThemeProps(ht); } private void createUI() { // Set up screen for transitions. mAwayForm = new Form("Away"); mAwayForm.addComponent(new Label("Choose Back to return to the home screen.")); mMenuTajwid = new Form("MENU DASAR TAJWID"); // mMenuTajwid mMenuTajwid.setLayout(new BoxLayout(BoxLayout.Y_AXIS)); btNunSukun = new Button("Hukum Nun Sukun & Tanwin"); btNunSukun.addActionListener(this); mMenuTajwid.addComponent(btNunSukun); btMimSukun = new Button("Hukum Mim Sukun"); btMimSukun.addActionListener(this); mMenuTajwid.addComponent(btMimSukun); btNunTasjid = new Button("Hukum Nun Tasydid & Min Tasydid"); btNunTasjid.addActionListener(this); mMenuTajwid.addComponent(btNunTasjid); btLamtarif = new Button("Hukum Laam Ta'rief"); btLamtarif.addActionListener(this); mMenuTajwid.addComponent(btLamtarif); btIdgham = new Button("Idgham"); btIdgham.addActionListener(this); mMenuTajwid.addComponent(btIdgham); btMaad = new Button("Maad"); btMaad.addActionListener(this); mMenuTajwid.addComponent(btMaad); btRaa = new Button("Raa'"); btRaa.addActionListener(this); mMenuTajwid.addComponent(btRaa); mBackCommand = new Command("Back"); mMenuTajwid.addCommand(mBackCommand); mMenuTajwid.addCommandListener(this); // Use setCommandListener() with LWUIT 1.3 or earlier. // Set up main screen. mHomeForm = new Form("Java Mobile Learning"); mHomeForm.setLayout(new BoxLayout(BoxLayout.Y_AXIS)); btMenu = new Button("TAJWID LEARNING"); btMenu.addActionListener(this); mHomeForm.addComponent(btMenu); try { btHelp = new Button("HELP",Image.createImage("/help.ico")); btHelp.addActionListener(this); mHomeForm.addComponent(btHelp); } catch(IOException e) { } btExit = new Button("EXIT"); btExit.addActionListener(this); mHomeForm.addComponent(btExit); mExitCommand = new Command("Keluar"); mHomeForm.addCommand(mExitCommand); mHomeForm.addCommandListener(this); // Use setCommandListener() with LWUIT 1.3 or earlier. } }

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• login form whith java/sqlite

  - by tuxou

  hi I would like to create a login form for my application with the possibility to add or remove users for an sqlite database, i have created the table users(nam, pass) but i can't unclud it in my login form, it someone could help me this is my login code: import java.awt.*; import java.awt.event.*; import javax.swing.*; public class login extends JFrame { // Variables declaration private JLabel jLabel1; private JLabel jLabel2; private JTextField jTextField1; private JPasswordField jPasswordField1; private JButton jButton1; private JPanel contentPane; // End of variables declaration public login() { super(); create(); this.setVisible(true); } private void create() { jLabel1 = new JLabel(); jLabel2 = new JLabel(); jTextField1 = new JTextField(); jPasswordField1 = new JPasswordField(); jButton1 = new JButton(); contentPane = (JPanel)this.getContentPane(); // // jLabel1 // jLabel1.setHorizontalAlignment(SwingConstants.LEFT); jLabel1.setForeground(new Color(0, 0, 255)); jLabel1.setText("username:"); // // jLabel2 // jLabel2.setHorizontalAlignment(SwingConstants.LEFT); jLabel2.setForeground(new Color(0, 0, 255)); jLabel2.setText("password:"); // // jTextField1 // jTextField1.setForeground(new Color(0, 0, 255)); jTextField1.setSelectedTextColor(new Color(0, 0, 255)); jTextField1.setToolTipText("Enter your username"); jTextField1.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { jTextField1_actionPerformed(e); } }); // // jPasswordField1 // jPasswordField1.setForeground(new Color(0, 0, 255)); jPasswordField1.setToolTipText("Enter your password"); jPasswordField1.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { jPasswordField1_actionPerformed(e); } }); // // jButton1 // jButton1.setBackground(new Color(204, 204, 204)); jButton1.setForeground(new Color(0, 0, 255)); jButton1.setText("Login"); jButton1.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { jButton1_actionPerformed(e); } }); // // contentPane // contentPane.setLayout(null); contentPane.setBorder(BorderFactory.createEtchedBorder()); contentPane.setBackground(new Color(204, 204, 204)); addComponent(contentPane, jLabel1, 5,10,106,18); addComponent(contentPane, jLabel2, 5,47,97,18); addComponent(contentPane, jTextField1, 110,10,183,22); addComponent(contentPane, jPasswordField1, 110,45,183,22); addComponent(contentPane, jButton1, 150,75,83,28); // // login // this.setTitle("Login To Members Area"); this.setLocation(new Point(76, 182)); this.setSize(new Dimension(335, 141)); this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); this.setResizable(false); } /** Add Component Without a Layout Manager (Absolute Positioning) */ private void addComponent(Container container,Component c,int x,int y,int width,int height) { c.setBounds(x,y,width,height); container.add(c); } private void jTextField1_actionPerformed(ActionEvent e) { } private void jPasswordField1_actionPerformed(ActionEvent e) { } private void jButton1_actionPerformed(ActionEvent e) { System.out.println("\njButton1_actionPerformed(ActionEvent e) called."); String username = new String(jTextField1.getText()); String password = new String(jPasswordField1.getText()); if(username.equals("") || password.equals("")) // If password and username is empty Do this { jButton1.setEnabled(false); JLabel errorFields = new JLabel("You must enter a username and password to login."); JOptionPane.showMessageDialog(null,errorFields); jTextField1.setText(""); jPasswordField1.setText(""); jButton1.setEnabled(true); this.setVisible(true); } else { JLabel optionLabel = new JLabel("You entered "+username+" as your username. Is this correct?"); int confirm =JOptionPane.showConfirmDialog(null,optionLabel); switch(confirm){ // Switch Case case JOptionPane.YES_OPTION: // Attempt to Login user jButton1.setEnabled(false); // Set button enable to false to prevent 2 login attempts break; case JOptionPane.NO_OPTION: // No Case.(Go back. Set text to 0) jButton1.setEnabled(false); jTextField1.setText(""); jPasswordField1.setText(""); jButton1.setEnabled(true); break; case JOptionPane.CANCEL_OPTION: // Cancel Case.(Go back. Set text to 0) jButton1.setEnabled(false); jTextField1.setText(""); jPasswordField1.setText(""); jButton1.setEnabled(true); break; } // End Switch Case } } public static void main(String[] args) { JFrame.setDefaultLookAndFeelDecorated(true); JDialog.setDefaultLookAndFeelDecorated(true); try { UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel"); } catch (Exception ex) { System.out.println("Failed loading L&F: "); System.out.println(ex); } new login(); }; }

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• Java Developer Days India Trip Report

  - by reza_rahman

  You are probably aware of Oracle's decision to discontinue the relatively resource intensive regional JavaOnes in favor of more Java Developer Days, virtual events and deeper involvement with independent conferences. In comparison to the regional JavaOnes, Java Developer Days are smaller, shorter (typically one full day), more focused (mostly Oracle speakers/topics) and more local (targeting cities). For those who have been around the Java ecosystem for a few years, they are basically the current incarnation of the highly popular and developer centric Sun Tech Days. October 21st through October 25th I spoke at Java Developer Days India. This was basically three separate but identical events in the cities of Pune (October 21st), Chennai (October 24th) and Bangalore (October 25th). For those with some familiarity with India, other than Hyderabad these cities are India's IT powerhouses. The events were basically focused on Java EE. I delivered five of the sessions (yes, you read that right), while my friend NetBeans Group Product Manager Ashwin Rao delivered three talks. Jagadish Ramu from the GlassFish team India helped me out in Bangalore by delivering two sessions. It was also a pleasure to introduce my co-contributor to the Cargo Tracker Java EE Blue Prints project Vijay Nair at Bangalore during the opening talk. I thought it was a great dynamic between Ashwin and I flipping between talking about the new features and demoing live code in NetBeans. The following were my sessions (source PDF and abstracts posted as usual on my SlideShare account): JavaEE.Next(): Java EE 7, 8, and Beyond Building Java HTML5/WebSocket Applications with JSR 356 What’s New in Java Message Service 2 JAX-RS 2: New and Noteworthy in the RESTful Web Services API Using NoSQL with JPA, EclipseLink and Java EE The event went well and was packed in all three cities. The Q&A was great and Indian developers were particularly generous with kind words :-). It seemed the event and our presence was appreciated in the truest sense which I must say is a rarity. The events were exhausting but very rewarding at the same time. As hectic as the three city trip was I tried to see at least some of the major sights (mostly at night) since this was my very first time to India. I think the slideshow below is a good representation of the riddle wrapped up in an enigma that is India (and the rest of the Indian sub-continent for that matter): Ironically enough what struck me the most during this trip is the woman pictured below - Shushma. My chauffeur, tour guide and friend for a day, she fluidly navigated the madness that is Mumbai traffic with skills that would make Evel Knievel blush while simultaneously pointing out sights and prompting me to take pictures (Mumbai was my stopover and gateway to/from India). In some ways she is probably the most potent symbol of the new India. When we parted ways I told her she should take solace in the fact she has won mostly without a fight a potentially hazardous battle her sisters across the Arabian sea are still fighting. I'm not sure she entirely understood the significance of what I told her. I hope that she did. I also had occasion to take a pretty cool local bus ride from Chennai to Bangalore instead of yet another boring flight. All in all I really enjoyed the trip to India and hope to return again soon. Jai Hind :-)!

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• Talking JavaOne with Rock Star Adam Bien

  - by Janice J. Heiss

  Among the most celebrated developers in recent years, especially in the domain of Java EE and JavaFX, is consultant Adam Bien, who, in addition to being a JavaOne Rock Star for Java EE sessions given in 2009 and 20011, is a Java Champion, the winner of Oracle Magazine’s 2011 Top Java Developer of the Year Award, and recently won a 2012 JAX Innovation Award as a top Java Ambassador. Bien will be presenting the following sessions: TUT3907 - Java EE 6/7: The Lean Parts CON3906 - Stress-Testing Java EE 6 Applications Without Stress CON3908 - Building Serious JavaFX 2 Applications CON3896 - Interactive Onstage Java EE Overengineering I spoke with Bien to get his take on Java today. He expressed excitement that the smallest companies and startups are showing increasing interest in Java EE. “This is a very good sign,” said Bien. “Only a few years ago J2EE was mostly used by larger companies -- now it becomes interesting even for one-person shows. Enterprise Java events are also extremely popular. On the Java SE side, I'm really excited about Project Nashorn.” Nashorn is an upcoming JavaScript engine, developed fully in Java by Oracle, and based on the Da Vinci Machine (JSR 292) which is expected to be available for Java 8.   Bien expressed concern about a common misconception regarding Java's mediocre productivity. “The problem is not Java,” explained Bien, “but rather systems built with ancient patterns and approaches. Sometimes it really is ‘Cargo Cult Programming.’ Java SE/EE can be incredibly productive and lean without the unnecessary and hard-to-maintain bloat. The real problems are ‘Ivory Towers’ and not Java’s lack of productivity.” Bien remarked that if there is one thing he wanted Java developers to understand it is that, "Premature optimization is the root of all evil. Or at least of some evil. Modern JVMs and application servers are hard to optimize upfront. It is far easier to write simple code and measure the results continuously. Identify the hotspots first, then optimize.” He advised Java EE developers to, “Rethink everything you know about Enterprise Java. Before you implement anything, ask the question: ‘Why?’ If there is no clear answer -- just don't do it. Most well known best practices are outdated. Focus your efforts on the domain problem and not the technology.” Looking ahead, Bien said, “I would like to see open source application servers running directly on a hypervisor. Packaging the whole runtime in a single file would significantly simplify the deployment and operations.”Check out a recent Java Magazine interview with Bien about his Java EE 6 stress monitoring tool here. Originally published on blogs.oracle.com/javaone.

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• JavaOne Rock Star – Adam Bien

  - by Janice J. Heiss

  Among the most celebrated developers in recent years, especially in the domain of Java EE and JavaFX, is consultant Adam Bien, who, in addition to being a JavaOne Rock Star for Java EE sessions given in 2009 and 2011, is a Java Champion, the winner of Oracle Magazine’s 2011 Top Java Developer of the Year Award, and recently won a 2012 JAX Innovation Award as a top Java Ambassador. Bien will be presenting the following sessions: TUT3907 - Java EE 6/7: The Lean Parts CON3906 - Stress-Testing Java EE 6 Applications Without Stress CON3908 - Building Serious JavaFX 2 Applications CON3896 - Interactive Onstage Java EE Overengineering I spoke with Bien to get his take on Java today. He expressed excitement that the smallest companies and startups are showing increasing interest in Java EE. “This is a very good sign,” said Bien. “Only a few years ago J2EE was mostly used by larger companies -- now it becomes interesting even for one-person shows. Enterprise Java events are also extremely popular. On the Java SE side, I'm really excited about Project Nashorn.” Nashorn is an upcoming JavaScript engine, developed fully in Java by Oracle, and based on the Da Vinci Machine (JSR 292) which is expected to be available for Java 8.    Bien expressed concern about a common misconception regarding Java's mediocre productivity. “The problem is not Java,” explained Bien, “but rather systems built with ancient patterns and approaches. Sometimes it really is ‘Cargo Cult Programming.’ Java SE/EE can be incredibly productive and lean without the unnecessary and hard-to-maintain bloat. The real problems are ‘Ivory Towers’ and not Java’s lack of productivity.” Bien remarked that if there is one thing he wanted Java developers to understand it is that, "Premature optimization is the root of all evil. Or at least of some evil. Modern JVMs and application servers are hard to optimize upfront. It is far easier to write simple code and measure the results continuously. Identify the hotspots first, then optimize.”   He advised Java EE developers to, “Rethink everything you know about Enterprise Java. Before you implement anything, ask the question: ‘Why?’ If there is no clear answer -- just don't do it. Most well known best practices are outdated. Focus your efforts on the domain problem and not the technology.” Looking ahead, Bien remarked, “I would like to see open source application servers running directly on a hypervisor. Packaging the whole runtime in a single file would significantly simplify the deployment and operations.” Check out a recent Java Magazine interview with Bien about his Java EE 6 stress monitoring tool here.

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