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• BIRT logging in the onFetch step of a dataset

  - by Mark Underwood

  Hi all, Im having trouble with some javascript in the onFetch step of a dataset in a BIRT report. I've added logging in the initialise step of the report in a few different ways. The runtime im using is Tivoli Common Reporting, and they supply a logging framework. Its initialised as so reportContext.setPersistentGlobalVariable("logfileName", "DateRangeParm.log"); setupLogging(); logInitialize(); debugLogger("Started logging in initialize step"); debugLogger("Date: " + new Date()); This works fine to log on the steps of the report(ie initialise, BeforeRender, AfterRender etc.) but I cant seem to log anything in the Dataset steps such as onFetch etc. Ive also tried importPackage(Packages.java.util.logging); var fileHandler = new FileHandler("/tmp/birt.log", true); var rootLogger = Logger.getLogger(""); rootLogger.addHandler(fileHandler); as the BIRT instructions tell me to do in the BIRTFAQ Once again this allowed me to log things in the main report (ie BeforeRender etc) but not in the dataset onFetch Step. Ive also tried putting the previous javascript into the onFetch and that didnt seem to work either. Its a bit of a mystery. Im running Ubuntu 9.04. IBM java 1.5. Eclipse 3.5.0 and BIRT 2.5.1. Any help would be great.

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• Grails Mail port configuration

  - by bsreekanth

  Hello, I am trying to send mail through grails mail plugin. I configured according to the documentation, and also followed few blog posts (http://blog.lourish.com/2010/04/02/sending-asynchronous-html-email-in-grails-with-activemq-jms-and-gmail/). That post mention that the closure way of declaring the configuration overrides others, but not true. Anyway I tried both approach, but seems like the port is still use the smtp default one. I get the below exception. exception: org.springframework.mail.MailSendException: Mail server connection failed; nested exception is javax.mail.MessagingException: Could not connect to SMTP host: localhost, port: 25; nested exception is: java.net.ConnectException: Connection refused: connect Now, I wrote a small program directly using the java mail library, and I could send the mail with that. The configuration is shown below. tried additional config "mail.smtp.port":"465"", but no change.. used the parameters mentioned in the above blog post, result same grails { mail { host = "smtp.gmail.com" port = "465" username = "[email protected]" password = "mypwd" props = ["mail.smtp.auth":"true", // "mail.smtp.port":"465", "mail.smtp.socketFactory.port":"465", "mail.smtp.socketFactory.class":"javax.net.ssl.SSLSocketFactory", "mail.smtp.socketFactory.fallback":"false"] } } thanks in advance.. Update: It is not port or firewall config, as when I made a grails application from scratch, and tried with the same config, everything works. Also, asked in grails forum http://grails.1312388.n4.nabble.com/grails-mail-mailSender-does-not-have-config-values-td2237704.html#a2237704 . Hope get a lead to try.

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• Maven WTP webapp with maven-eclipse-plugin but without m2eclipse

  - by chrsk

  I use the eclipse:eclipse goal to generate an Eclipse Project environment. The deployment works fine. The goal creates the var classpath entries for all needed dependencies. With m2eclipse there was the Maven Container which defines an export folder which was WEB-INF/lib for me. But i don't want to rely on m2eclipse so i don't want to use it anymore. the class path entries which are generated by eclipse:eclipse goal don't have such a export folder. While booting the servlet container with WTP it publishes all resources and classes except the libraries to the context. Whats missing to publish the needed libs, or isn't that possible without m2eclipse integration? IDE Configuration Eclipse 3.5 JEE Galileo Maven 2 m2eclipse The maven-eclipse-plugin configuration <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-eclipse-plugin</artifactId> <version>2.8</version> <configuration> <projectNameTemplate>opensaga-[artifactId]</projectNameTemplate> <useProjectReferences>false</useProjectReferences> <downloadSources>false</downloadSources> <downloadJavadocs>false</downloadJavadocs> <wtpmanifest>true</wtpmanifest> <wtpversion>2.0</wtpversion> <wtpapplicationxml>true</wtpapplicationxml> <wtpContextName>opensaga-[artifactId]</wtpContextName> <additionalProjectFacets> <jst.java>5.0</jst.java> <jst.web>2.3</jst.web> </additionalProjectFacets> </configuration> </plugin>

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• How to right-justify icon in a JLabel?

  - by geoffreyzheng

  For a JLabel with icon, if you setHorizontalTextPosition(SwingConstants.LEADING), the icon is painted right after text, no matter how wide the label is. This is particularly bad for a list, as the icons would be all over the place depending on how long the text is for each item. I traced the code and it seems to be that in SwingUtilities#layoutCompoundLabelImpl, text width is simply set to SwingUtilities2.stringWidth(c, fm, text), and icon x is set to follow text without considering label width. Here is the simplest case: import java.awt.*; import javax.swing.*; public class TestJLabelIcon { public static void main(String args[]) { EventQueue.invokeLater(new Runnable() { public void run() { JLabel c = new JLabel("abc"); c.setHorizontalTextPosition(SwingConstants.LEADING); c.setHorizontalAlignment(SwingConstants.LEADING); c.setIcon(UIManager.getIcon("FileChooser.detailsViewIcon")); c.setBorder(BorderFactory.createLineBorder(Color.RED)); JFrame frame = new JFrame(); frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE ); frame.getContentPane().add(c); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); } }); } } You can see that label always fills the frame but icon stays put. You'll get the mirror problem if you set both arguments to TRAILING. I know I can override the UI, or use a JPanel, etc. I just wonder if I'm missing something simple in JLabel. If not, it seems like a Java bug. FYI this is jdk1.6.0_06 on Windows XP.

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• JAXB - How to add xmlns:xsi=http://www.w3.org/2001/XMLSchema-instance

  - by Anurag

  I am using JAXB to create XML file from a result set. I have created java/ /class files using the xsd with the help of xjc utiliy. Now I am trying to create the xml file using the Marshaller. In the XML file I do not see theh xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" attribute with the root tag. My xsd Below is the code : public class JAXBConstructor { public void generateXMLDocument(File xmlDocument){ try { JAXBContext jaxbContext = JAXBContext.newInstance("com"); Marshaller marshaller = jaxbContext.createMarshaller(); marshaller.setProperty(Marshaller.JAXB_FRAGMENT, true); marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true); com.ObjectFactory factory = new com.ObjectFactory(); USERTASKSImpl userTasks =(USERTASKSImpl)(factory.createUSERTASKS()); USERTASKTypeImpl userTaskType = (USERTASKTypeImpl)(factory.createUSERTASKSTypeUSERTASKType()); userTaskType.setName("zmannan"); userTaskType.setCode("G5023920"); java.util.List userTaskList=userTasks.getUSERTASK(); userTaskList.add(userTaskType); marshaller.marshal(userTasks, new FileOutputStream("User_Task.xml")); } Output of the code : This does not contain the XMLSchema value - < ?xml version="1.0" encoding="UTF-8" standalone="yes"? < USER_TASKS xmlns="http://schemas.jpmchase.net/Recertification" < CodeG5023920< /Code < Namezmannan< /Name < /USER_TASK < /USER_TASKS Please help how can I add the schema-instance value in the rrot tag.

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• How to mock HTTPSession/FlexSession with TestNG and some Mocking Framework

  - by ifischer

  I'm developing a web application running on Tomcat 6, with Flex as Frontend. I'm testing my backend with TestNG. Currently, I'm trying to test the following method in my Java-Backend: public UserPE login(String mail, String password) { UserPE dbuser = findUserByMail(mail); if (dbuser == null || !dbuser.getPassword().equals(password)) throw new RuntimeException("Invalid username and/or password"); // Save logged in user FlexSession session = FlexContext.getFlexSession(); session.setAttribute("user", dbuser); return dbuser; } The method needs access to the FlexContext which only exists when i run it on the Servlet container (don't bother if you don't know Flex, it's more a Java-Mocking question in general). Otherwise i get a Nullpointer exception when calling session.setAttribute(). Unfortunately, I cannot set the FlexContext from outside, which would make me able to set it from my tests. It's just obtained inside the method. What would be the best way to test this method with a Mocking framework, without changing the method or the class which includes the method? And which framework would be the easiest for this use case (there are hardly other things i have to mock in my app, it's pretty simple)? Sorry I could try out all of them for myself and see how i could get this to work, but i hope that i'll get a quickstart with some good advices!

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• Android RestTemplate Ok on emulator but fails on real device

  - by Hossein

  I'm using spring RestTemplate and it works perfect on emulator but if I run my app on real device I get HttpMessageNotWritableException ............ nested exception is java.net.SocketException: Broken pipe Here is some lines of my code(keep in mind my app works perfect on emulator) ............ LoggerUtil.logToFile(TAG, "url is [" + url + "]"); LoggerUtil.logToFile(TAG, "NetworkInfo - " + connectivityManager.getActiveNetworkInfo()); ResponseEntity<T> responseEntity = restTemplate.exchange(url, HttpMethod.POST, requestEntity, clazz); ............. I know my device's network works perfect because all other applications on my device are working and also using device browser I'm able to connect to my server so my server is available. My server is up and running and my device is able to connect to my server so why I get java.net.SocketException: Broken pipe ?!!!!!!! Before I call restTemplate.exchange() I log NetworkInfo and it looks ok -type: WIFI -status: CONNECTED/CONNECTED -isAvailable: true Thanks in advance. Update: It is really weird Even if I use HttpURLConnection, it works perfectly on emulator but on real device I get 400 Bad Request Here is my code HttpURLConnection con = null; try { String url = ....; LoggerUtil.logToFile(TAG, "url [" + url + "]" ); con = (HttpURLConnection) new URL(url).openConnection(); con.setRequestMethod("POST"); con.setRequestProperty("Connection", "Keep-Alive"); con.setDoInput(true); con.setDoOutput(true); con.setUseCaches(false); con.connect(); LoggerUtil.logToFile(TAG, "con.getResponseCode is " + con.getResponseCode()); LoggerUtil.logToFile(TAG, "con.getResponseMessage is " + con.getResponseMessage()); } catch(Throwable t){ LoggerUtil.logToFile(TAG, "*** failed [" + t + "]" ); } in log file I see con.getResponseCode is 400 con.getResponseMessage is Bad Request

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• What is the difference between the Lego Mindstorms 1.0 and 2.0

  - by Gavimoss

  I am thinking about buying a mindstorms kit (I don't currently own one but I have used 1.0 at university) and I am a bit unsure as to the benefits of 2.0 over 1.0. I have seen other posts on the subject all saying generally 2.0 is better but I have some more specific questions about this that I can't seem to find any answers on. Apart from the different lego pieces and sensors you get with the 2.0 kit, is there any difference between a 1.0 nxt brick and 2.0 nxt brick? From what I can determine from other sources, they are the same except for the firmware installed. Am I right in saying I could buy a 1.0 kit and install the same firmware that comes with the 2.0 kit and the bricks would be the same or is the 1.0 brick not compatible with the 2.0 firmware??? Also, I plan to use a different programming language like c or java so I need to install specific firmware for that anyway like librcx or lejos right? So if using c or java as opposed to the provided lego coding methods it doesn't matter if I am using 1.0 or 2.0 (except for the lego pieces in the kit) am I right? In a nutshell, assuming I am using librcx or lejos and I don't care about the sensors and lego pieces included, is there any benefit to buying a 2.0 kit over the 1.0 kit? Thanks in advance

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• JEE6 Global JNDI Name and Maven Deployment

  - by wobblycogs

  I'm having some problems with the global JNDI names of my EJB resources which is (or at least will) cause my JNDI look ups to fail. The project is being developed on Netbeans and is a standard Maven Web Application. When my application is deployed to GF3.0 the application name is set to something like: com.example_myapp_war_1.0-SNAPSHOT which is all well and good from Netbeans point of view because it ensures the name is unique but it also means all the EJBs get global names such as this: java:global/com.example_myapp_war_1.0-SNAPSHOT/CustomerService This, of course, is going to cause problems because every time the version changes all the global names change (I've tested this by changing the version and the names indeed changed). The name is being generated from the POM file and it's a concatenation of: <groupId>com.example</groupId> <artifactId>myapp</artifactId> <packaging>war</packaging> <version>1.0-SNAPSHOT</version> Up until now I've got away with just injecting all the resources using @EJB but now I need to access the CustomerService EJB from a JSF Converter so I'm doing a JNDI look up like this: try { Context ctx = new InitialContext(); CustomerService customerService = (CustomerService)ctx.lookup( "java:global/com.example_myapp_war_1.0-SNAPSHOT/CustomerService" ); return customerService.get(submittedValue); } catch( Exception e ) { logger.error( "Failed to convert customer.", e ); return null; } which will clearly break when the application is properly released and the module name changes. So, the million dollar question: how can I set the modle name in maven or how do I recover the module name so that I can programatically build the JNDI name at runtile. I've tried setting it in the web.xml file as suggested by that link but it was ignored. I think I'd rather build the name at runtime as that means there is less scope for screw ups when the application is deployed. Many thanks for any help, I've been tearing my hair out all day on this.

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• ejb testing issues with netbeans and openejb

  - by SibzTer

  I have created a netbeans 6.7 EnterpriseApplication project with ejb and war modules with a test stateless session ejb with a simple sayHello() method. I also added the openEjb library in order to unit test the ejb. Everything runs fine except that I keep getting the following error: Testsuite: com.myapp.test.NewEmptyJUnitTest Apache OpenEJB 3.1.1 build: 20090530-06:18 http://openejb.apache.org/ INFO - openejb.home = C:\Users\me\Documents\NetBeansProjects\TestEnterpriseApp\TestEnterpriseApp-ejb INFO - openejb.base = C:\Users\me\Documents\NetBeansProjects\TestEnterpriseApp\TestEnterpriseApp-ejb INFO - Configuring Service(id=Default Security Service, type=SecurityService, provider-id=Default Security Service) INFO - Configuring Service(id=Default Transaction Manager, type=TransactionManager, provider-id=Default Transaction Manager) INFO - Found ClientModule in classpath: C:\Program Files\NetBeans 6.7.1\java2\ant\lib\ant.jar INFO - Found ClientModule in classpath: C:\Program Files\NetBeans 6.7.1\java2\ant\lib\ant-launcher.jar INFO - Found EjbModule in classpath: C:\Users\me\Documents\NetBeansProjects\TestEnterpriseApp\TestEnterpriseApp-ejb\build\jar INFO - Found ClientModule in classpath: C:\Users\me\Documents\NetBeansProjects\TestEnterpriseApp\lib\OpenEJB\xml-resolver-1.2.jar INFO - Found ClientModule in classpath: C:\Users\me\Documents\Downloads\glassfish\lib\webservices-tools.jar INFO - Beginning load: C:\Program Files\NetBeans 6.7.1\java2\ant\lib\ant.jar INFO - Beginning load: C:\Program Files\NetBeans 6.7.1\java2\ant\lib\ant-launcher.jar INFO - Beginning load: C:\Users\me\Documents\NetBeansProjects\TestEnterpriseApp\TestEnterpriseApp-ejb\build\jar INFO - Beginning load: C:\Users\me\Documents\NetBeansProjects\TestEnterpriseApp\lib\OpenEJB\xml-resolver-1.2.jar INFO - Beginning load: C:\Users\me\Documents\Downloads\glassfish\lib\webservices-tools.jar INFO - Configuring enterprise application: classpath.ear WARN - No application-client.xml found assuming annotations present: classpath.ear, module: ant.jar WARN - No application-client.xml found assuming annotations present: classpath.ear, module: ant-launcher.jar WARN - No application-client.xml found assuming annotations present: classpath.ear, module: xml-resolver-1.2.jar WARN - No application-client.xml found assuming annotations present: classpath.ear, module: webservices-tools.jar java.lang.Exception: Could not load 1/0/com/sun/codemodel/CodeWriter.class at org.apache.xbean.finder.ClassFinder.readClassDef(ClassFinder.java:730) .... Turns out that I am getting the glassfish library webservices-tools.jar from somewhere somehow and I cant find out how to get rid of it so that I dont get the bunch of Exceptions whenever I try to run any junit tests. Has anyone faced this issue before? Can you help me resolve it please? Thanks.

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• aapt not found when building new Android app in NetBeans

  - by Oz

  I just installed NetBeans and the Android SDK following the instructions here. I am running Ubuntu 9.10 (Karmic). NetBeans is 6.7.1. The Android SDK is version 7. When I try to compile a new project it gives me the following error: Execute failed: java.io.IOException: Cannot run program "/home/oz/android-sdk/platforms/android-7/tools/aapt" (in directory "/home/oz/projects/ArmyBuilder/android"): java.io.IOException: error=2, No such file or directory When I go into that directory, I see that the file does exist and it has proper permissions to be executable by anyone, yet even bash can't find it! oz@Ivory-Coast:~/android-sdk/platforms/android-7/tools$ pwd /home/oz/android-sdk/platforms/android-7/tools oz@Ivory-Coast:~/android-sdk/platforms/android-7/tools$ ls -l total 4652 -rwxrwxrwx 1 oz oz 3472784 2010-04-20 18:16 aapt -rwxrwxrwx 1 oz oz 1050336 2010-04-20 18:16 aidl -rwxrwxrwx 1 oz oz 213698 2010-04-20 18:16 dexdump -rwxrwxrwx 1 oz oz 2497 2010-04-20 18:16 dx drwxr-xr-x 2 oz oz 4096 2010-04-20 18:16 lib -rw-r--r-- 1 oz oz 10800 2010-04-20 18:16 NOTICE.txt oz@Ivory-Coast:~/android-sdk/platforms/android-7/tools$ ./aapt bash: ./aapt: No such file or directory oz@Ivory-Coast:~/android-sdk/platforms/android-7/tools$ Googling for this error turns up a few other people having this same issue (ht tp://www.mentby.com/erisa/aapt-not-found.html, ht tp://www.helloandroid.com/content/file-not-found-hello-world-application) both with no responses.

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• How to set an EditText on top of a ListView ?

  - by Spredzy

  Hi everyone, I am trying to do an autocomplete version my way (logic, layout, etc...) , so I don't want to use the AutoCompleteTextView. My question is how to set an EditText on top of a ListView in a class inheriting from a ListAcvitivy. I tried two kinds of layout, none of them worked. First one : <EditText android:id="@+id/autocomplete_server" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_marginLeft="5dp" android:completionThreshold="1" android:singleLine="true"/> <ListView android:id="@id/android:list" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="#000000" android:layout_weight="1" android:drawSelectorOnTop="false"/> <TextView android:id="@id/android:empty" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="#FF0000" android:text="No data"/> This one only shows me the EditText but does not display the list Second one : <LinearLayout android:id="@id/android:list" android:orientation="horizontal" android:layout_width="fill_parent" android:layout_height="wrap_content" android:padding="5dp"> <EditText android:id="@+id/autocomplete_server" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_marginLeft="5dp" android:completionThreshold="1" android:singleLine="true"/> <ListView android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="#000000" android:layout_weight="1" android:drawSelectorOnTop="false"/> </LinearLayout> This sample gives me a : java.lang.RuntimeException: Unable to start activity ComponentInfo{com.eip.core/com.eip.core.Search}: java.lang.ClassCastException: android.widget.LinearLayout Does anyone have any idea bout how to implement an EditText on top of a listView ?

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• Suggestions for entering mobile development -- pure iPhone SDK, Android SDK, Mono Touch or Titanium

  - by Tom Cabanski

  I am entering mobile development. I have been working primarily in .NET since 1.0 came out in beta. Before that, I was mostly a C++ and Delphi guy and still dabble in C++ from time to time. I do web apps quite a bit so I am reasonably proficient with Javascript, JQuery and CSS. I have also done a few Java applications. I started web programming with CGI and live mostly in the ASP.NET MVC world these days. I am trying to decide on which platform/OS and tool to select. I am concerned with the size of the market available for my applications as well as the marketibility of the skills I will pick up. The apps I have in mind would work on both phones and pads. Some aspects of what I have in mind will play better on the bigger screens that will be available on pads. Here are the options I am considering: Apple iPhone/iPad using pure Apple SDK (Objective-C) Apple iPhone/iPad using Mono Touch (C#) Android using pure Android SDK (Java) Multiple platforms using something like Titanium to generate native apps from web technologies (HTML, CSS and Javascript) Multiple platforms using HTML5 web applications that run in the browser (HTML, CSS and Javascript). Which option would you choose? Do you have a different suggestion? What are the pros and cons?

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• Base64 en/decoding between xstream and iPhone SDK

  - by Matt McMinn

  I am passing a byte array from a java server to an iPad client in XML. The server is using xstream to convert the byte array to XML with the EncodedByteArrayConverter, which should convert the array to Base 64. Using xstream, I can decode the xml back to the proper byte array in a java client, but in the iPad client, I'm getting an invalid length error. To do my decoding, I'm using the code at the bottom of this page. The length of the string is indeed not a multiple of 4, so there must be something strange with my string - although since xstream can decode it just fine, I'm guessing there's just something I need to to on the iPad side to get it to decode. I've tried cutting off padding at the end of the string to get it down to the right size, and that does allow the decoder to work, but I end up with JPG's that have invalid headers, and are not displayable. On the server side, I'm using the following code: Object rtrn = getByteArray(); XStream xstream = new XStream(); String xml = xstream.toXML(rtrn); On the client side, I'm calling the above decoder from the XML parsing callback like this: -(void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string { NSLog(@"Converting data; string length: %d", [string length]); //NSLog(@"%@", string); NSData *data = [Base64 decode:string]; NSLog(@"converted data length: %d", [data length]); } Any ideas what could be going wrong?

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• user input question

  - by jdbeverly87

  My program checks to test if a word or phrase is a palindrome (reads the same both backward and forward, ex "racecar"). The issue I'm having is after someone enters in "racecar" getting it to actually test. In the below code, I marked where if I type in "racecar" and run, Java returns the correct answer so I know I'm right there. But what am I missing as far as entering it into the console. I think my code is ok, but maybe I have something missing or in the wrong spot? Not really looking for a new answer unless I'm missing something, but if possible perhaps a pro at this moving my code to the correct area bc I'm stuck! `import java.util.*; public class Palindrome { public static void main(String[] args) { String myInput; Scanner in = new Scanner(System.in); System.out.println("Enter a word or phrase: "); **//this asks user for input but doesn't check for whether or not it is a palindrome** myInput = in.nextLine(); in.close(); System.out.println("You entered: " + myInput); } { String s="racecar"; **//I can type a word here and it works but I need** int i; **//I need it to work where I ask for the input** int n=s.length(); String str=""; for(i=n-1;i>=0;i--) str=str+s.charAt(i); if(str.equals(s)) System.out.println(s+ " is a palindrome"); else System.out.println(s+ " is not a palindrome"); } }` I'm new at programming so I'm hoping what I got is ok. I know the palindrome test works I'm just needing helping having it test thru where I'm entering it into the console. Thanks

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• Hidden features of Perl?

  - by Adam Bellaire

  What are some really useful but esoteric language features in Perl that you've actually been able to employ to do useful work? Guidelines: Try to limit answers to the Perl core and not CPAN Please give an example and a short description Hidden Features also found in other languages' Hidden Features: (These are all from Corion's answer) C# Duff's Device Portability and Standardness Quotes for whitespace delimited lists and strings Aliasable namespaces Java Static Initalizers JavaScript Functions are First Class citizens Block scope and closure Calling methods and accessors indirectly through a variable Ruby Defining methods through code PHP Pervasive online documentation Magic methods Symbolic references Python One line value swapping Ability to replace even core functions with your own functionality Other Hidden Features: Operators: The bool quasi-operator The flip-flop operator Also used for list construction The ++ and unary - operators work on strings The repetition operator The spaceship operator The || operator (and // operator) to select from a set of choices The diamond operator Special cases of the m// operator The tilde-tilde "operator" Quoting constructs: The qw operator Letters can be used as quote delimiters in q{}-like constructs Quoting mechanisms Syntax and Names: There can be a space after a sigil You can give subs numeric names with symbolic references Legal trailing commas Grouped Integer Literals hash slices Populating keys of a hash from an array Modules, Pragmas, and command-line options: use strict and use warnings Taint checking Esoteric use of -n and -p CPAN overload::constant IO::Handle module Safe compartments Attributes Variables: Autovivification The $[ variable tie Dynamic Scoping Variable swapping with a single statement Loops and flow control: Magic goto for on a single variable continue clause Desperation mode Regular expressions: The \G anchor (?{}) and '(??{})` in regexes Other features: The debugger Special code blocks such as BEGIN, CHECK, and END The DATA block New Block Operations Source Filters Signal Hooks map (twice) Wrapping built-in functions The eof function The dbmopen function Turning warnings into errors Other tricks, and meta-answers: cat files, decompressing gzips if needed Perl Tips See Also: Hidden features of C Hidden features of C# Hidden features of C++ Hidden features of Java Hidden features of JavaScript Hidden features of Ruby Hidden features of PHP Hidden features of Python

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• Bouncycastle encryption algorithms not provided

  - by David Read

  I'm trying to use BouncyCastle with android to implement ECDH and EL Gamal. I've added the bouncycastle jar file (bcprov-jdk16-144.jar) and written some code that works with my computers jvm however when I try and port it to my android application it throws: java.security.NoSuchAlgorithmException: KeyPairGenerator ECDH implementation not found A sample of the code is: Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider()); java.security.KeyPairGenerator keyGen = org.bouncycastle.jce.provider.asymmetric.ec.KeyPairGenerator.getInstance("ECDH", "BC"); ECGenParameterSpec ecSpec = new ECGenParameterSpec("prime192v1"); keyGen.initialize(ecSpec, SecureRandom.getInstance("SHA1PRNG")); KeyPair pair = keyGen.generateKeyPair(); PublicKey pubk = pair.getPublic(); PrivateKey prik = pair.getPrivate(); I then wrote a simple program to see what encryption algorithms are available and ran it on my android emulator and on my computers jvm the code was: Set<Provider.Service> rar = new org.bouncycastle.jce.provider.BouncyCastleProvider().getServices(); Iterator<Provider.Service> ir = rar.iterator(); while(ir.hasNext()) System.out.println(ir.next().getAlgorithm()); On android I do not get any of the EC algorithms while ran normally on my computer it's fine. I'm also getting the following two errors when compiling for a lot of the bouncy castle classes: 01-07 17:17:42.548: INFO/dalvikvm(1054): DexOpt: not resolving ambiguous class 'Lorg/bouncycastle/asn1/ASN1Encodable;' 01-07 17:17:42.548: DEBUG/dalvikvm(1054): DexOpt: not verifying 'Lorg/bouncycastle/asn1/ess/OtherSigningCertificate;': multiple definitions What am I doing wrong?

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• flex and jsf access the same instance of bean

  - by David

  i integrate a flex app in a jsf-icefaces app (in a jspx site with the ice:outputmedia-tag) and want to access the same instance of a bean from flex by remote, that jsf inject. i already connect with blazeds to a java-bean. this bean - like all other beans - get other beans by injection of jsf, but when i access the bean by remote from flex it doesnt hold the injected beans (like localizer and accesmanager, both session scoped) and i can't connect to the jsf session (FacesContext.getCurrentInstance() is null). this is because flex create a new instance of the bean and it’s not the same current instance, that jsf inject, i think. i can connect from flex to the database by create a new entity manager in the java bean, but that's not what i want, because it's again another entity manager...i want persist and get data over the accessmanager-bean. i know exadel fiji and flamingo, but i couldn't work with fiji, because my jsf app include the icefaces components and then it doesn't work with richfaces which fiji needs. and flamingo work only with jboss seam and spring. is it right? i also read about the spring-flex-integration, but the jsf application did not create with spring and i don't want to integrate spring in such a large jsf app. yesterday i read about the FlexFactory interface. this interface i have to implement in my own Factory and set it in the service-config.xml of blazeds as a factory read this. i still implement my own factory but i only get application scoped beans over the servlet context which i get over FlexContext.getServletContext().getAttribute("Bean"); and not session scoped beans... i hope there is a chance to connect throw flex and jsf... thanks!

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• Can I avoid explicit 'self'?

  - by bguiz

  I am fairly new to Python and trying to pick it up, so please forgive if this question has a very obvious answer! I have been learning Python by following some pygame tutorials. Therein I found extensive use of the keyword self, and coming from a primarily Java background, I find that I keep forgetting to type self. For example, instead of self.rect.centerx I would type rect.centerx, because, to me, rect is already a member variable of the class. The Java parallel I can think of for this situation is having to prefix all references to member variables with this. Am I stuck prefixing all member variables with self, or is there a way to declare them that would allow me to avoid having to do so? Even if what I am suggesting isn't "pythonic", I'd still like to know if it is possible. I have taken a look at these related SO questions, but they don't quite answer what I am after: Python - why use “self” in a class? Why do you need explicitly have the “self” argument into a Python method?

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• Assistance with building an inverted-index

  - by tipu

  It's part of an information retrieval thing I'm doing for school. The plan is to create a hashmap of words using the the first two letters of the word as a key and any words with the two letters saved as a string value. So, hashmap["ba"] = "bad barley base" Once I'm done tokenizing a line I take that hashmap, serialize it, and append it to the text file named after the key. The idea is that if I take my data and spread it over hundreds of files I'll lessen the time it takes to fulfill a search by lessening the density of each file. The problem I am running into is when I'm making 100+ files in each run it happens to choke on creating a few files for whatever reason and so those entries are empty. Is there any way to make this more efficient? Is it worth continuing this, or should I abandon it? I'd like to mention I'm using PHP. The two languages I know relatively intimately are PHP and Java. I chose PHP because the front end will be very simple to do and I will be able to add features like autocompletion/suggested search without a problem. I also see no benefit in using Java. Any help is appreciated, thanks.

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• load class not in classpath dynamically in web application - without using custom classloader

  - by swdeveloper

  I am developing a web application. The web application generates java classes on the fly. For example it generates class com.people.Customer.java In my code, I dynamically compile this to get com.people.Customer.class and store in some directory say repository/com/people/Customer.class which is not on the classpath of my application server.My application server(I am using WebSphere Application Server/Apache Tomcat etc) picks up the classes from the WEB-INF/classes directory. The Classloader would use this to load the classes. After compilation I need to load this class so that it becomes accessible to other classes using it after its creation. 4.When I use Thread.currentThread().getContextClassLoader().loadClass(com.people.Customer) obviously the Classloader is not able to load the class, since its not on the classpath(not in WEB-INF/classes). Due to similar reasons, getResource(..) or getResourceAsStream(..) also does not work. I need a way to : Read the class Customer.class maybe as a stream (or any other way would do) and then load it. Following are the constraints: I cannot add the repository folder to the WEB-INF/classes folder. I cannot create a new Custom ClassLoader. If I create a new ClassLoader and this loads the class, it will not be accessible to its parent ClassLoader. Is there any way of achieving this? If not this, in the worse case, is there a way of overriding the default class loader with a custom class loader for web applications the same classloader should be used to load applications throughout entire lifecycle of my web application. Appreciate any solution :)

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• KeepAlive packets over a Soap request

  - by Nycto

  I've been debugging some Soap requests we are making between two servers on the same VLAN. The app on one server is written in PHP, the app on the other is written in Java. I can control and make changes to the PHP code, but I can't affect the Java server. The PHP app forms the XML using the DOMDocument objects, then sends the request using the cURL extension. When the soap request took longer than 5 minutes to complete, it would always wait until the max timeout limit and exit with a message like this: Operation timed out after 900000 milliseconds with 0 bytes received After sniffing the packets that were being sent, it turns out that the problem was caused by a 5 minute timeout in the network that was closing what it thought was a stale connection. There were two ways to fix it: bump up the timeout in iptables, or start sending KeepAlive packets over the request. To be thorough, I would like to implement both solutions. Bumping up the timeout was easy for ops to do, but sending KeepAlive packets is turning out to be difficult. The cURL library itself supports this (see the --keepalive-time flag for the CLI app), but it doesn't appear that this has been implemented in the PHP cURL library. I even checked the source to make sure it wasn't an undocumented feature. So my question is this: How the heck can I get these packets sent? I see a few clear options, but I don't like any of them: Write a wrapper that will kick off the request by shell_execing the CLI app. This is a hack that I just don't like Update the cURL extension to support this. This is a non-option according to Ops. Open the socket myself. I know just enough to be dangerous. I also haven't seen a way to do this with fsockopen, but I could be missing something. Switch to another library. What exists that supports this? Thanks for any help you can offer.

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• Simple Android Binary Text Clock

  - by Hristo

  Hello, I want to create a simple android binary clock but my application crashes. I use 6 textview fields: 3 for the decimal and 3 for the binary representation of the current time (HH:mm:ss). Here's the code: import java.text.SimpleDateFormat; import java.util.Calendar; import android.app.Activity; import android.os.Bundle; import android.widget.TextView; public class Binary extends Activity implements Runnable { Thread runner; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); if (runner == null) { //start the song runner = new Thread(this); runner.start(); } } @Override public void run() { TextView hours_dec = (TextView) findViewById(R.id.hours_dec); TextView mins_dec = (TextView) findViewById(R.id.mins_dec); TextView secs_dec = (TextView) findViewById(R.id.secs_dec); TextView hours_bin = (TextView) findViewById(R.id.hours_bin); TextView mins_bin = (TextView) findViewById(R.id.mins_bin); TextView secs_bin = (TextView) findViewById(R.id.secs_bin); SimpleDateFormat hours_sdf = new SimpleDateFormat("HH"); SimpleDateFormat mins_sdf = new SimpleDateFormat("mm"); SimpleDateFormat secs_sdf = new SimpleDateFormat("ss"); Calendar cal = Calendar.getInstance(); while (runner != null) { WaitAMoment(); cal.getTime(); hours_dec.setText(hours_sdf.format(cal.getTime())); mins_dec.setText(mins_sdf.format(cal.getTime())); secs_dec.setText(secs_sdf.format(cal.getTime())); hours_bin.setText(String.valueOf(Integer.toBinaryString(Integer.parseInt((String) hours_dec.getText())))); mins_bin.setText(String.valueOf(Integer.toBinaryString(Integer.parseInt((String) mins_dec.getText())))); secs_bin.setText(String.valueOf(Integer.toBinaryString(Integer.parseInt((String) secs_dec.getText())))); } } protected void WaitAMoment() { try { Thread.sleep(100); } catch (InterruptedException e) { }; } }`

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• Why is this code invalid in C#?

  - by mmattax

  The following code will not compile: string foo = "bar"; Object o = foo == null ? DBNull.Value : foo; I get: Error 1 Type of conditional expression cannot be determined because there is no implicit conversion between 'System.DBNull' and 'string' To fix this, I must do something like this: string foo = "bar"; Object o = foo == null ? DBNull.Value : (Object)foo; This cast seems pointless as this is certainly legal: string foo = "bar"; Object o = foo == null ? "gork" : foo; It seems to me that when the ternary branches are of different types, the compiler will not autobox the values to the type object...but when they are of the same type then the autoboxing is automatic. In my mind the first statement should be legal... Can anyone describe why the compiler does not allow this and why the designers of C# chose to do this? I believe this is legal in Java...Though I have not verified this. Thanks. EDIT: I am asking for an understanding of why Java and C# handle this differently, what is going on underneath the scenes in C# that make this invalid. I know how to use ternary, and am not looking for a "better way" to code the examples. I understand the rules of ternary in C#, but I want to know WHY... EDIT (Jon Skeet): Removed "autoboxing" tag as no boxing is involved in this question.

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• How to inject a Session Bean into a Message Driven Bean?

  - by Hank

  Hi guys, I'm reasonably new to JEE, so this might be stupid.. bear with me pls :D I would like to inject a stateless session bean into a message-driven bean. Basically, the MDB gets a JMS message, then uses a session bean to perform the work. The session bean holds the business logic. Here's my Session Bean: @Stateless public class TestBean implements TestBeanRemote { public void doSomething() { // business logic goes here } } The matching interface: @Remote public interface TestBeanRemote { public void doSomething(); } Here's my MDB: @MessageDriven(mappedName = "jms/mvs.TestController", activationConfig = { @ActivationConfigProperty(propertyName = "acknowledgeMode", propertyValue = "Auto-acknowledge"), @ActivationConfigProperty(propertyName = "destinationType", propertyValue = "javax.jms.Queue") }) public class TestController implements MessageListener { @EJB private TestBean testBean; public TestController() { } public void onMessage(Message message) { testBean.doSomething(); } } So far, not rocket science, right? Unfortunately, when deploying this to glassfish v3, and sending a message to the appropriate JMS Queue, I get errors that glassfish is unable to locate the TestBean EJB: java.lang.IllegalStateException: Exception attempting to inject Remote ejb-ref name=mvs.test.TestController/testBean,Remote 3.x interface =mvs.test.TestBean,ejb-link=null,lookup=null,mappedName=,jndi-name=mvs.test.TestBean,refType=Session into class mvs.test.TestController Caused by: com.sun.enterprise.container.common.spi.util.InjectionException: Exception attempting to inject Remote ejb-ref name=mvs.test.TestController/testBean,Remote 3.x interface =mvs.test.TestBean,ejb-link=null,lookup=null,mappedName=,jndi-name=mvs.test.TestBean,refType=Session into class mvs.test.TestController Caused by: javax.naming.NamingException: Lookup failed for 'java:comp/env/mvs.test.TestController/testBean' in SerialContext [Root exception is javax.naming.NamingException: Exception resolving Ejb for 'Remote ejb-ref name=mvs.test.TestController/testBean,Remote 3.x interface =mvs.test.TestBean,ejb-link=null,lookup=null,mappedName=,jndi-name=mvs.test.TestBean,refType=Session' . Actual (possibly internal) Remote JNDI name used for lookup is 'mvs.test.TestBean#mvs.test.TestBean' [Root exception is javax.naming.NamingException: Lookup failed for 'mvs.test.TestBean#mvs.test.TestBean' in SerialContext [Root exception is javax.naming.NameNotFoundException: mvs.test.TestBean#mvs.test.TestBean not found]]] So my questions are: - is this the correct way of injecting a session bean into another bean (particularly a message driven bean)? - why is the naming lookup failing? Thanks for all your help! Cheers, Hank

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