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What is the JVM Scheduling algorithm ?

- by IHawk

Hello ! I am really curious about how does the JVM work with threads ! In my searches in internet, I found some material about RTSJ, but I don't know if it's the right directions for my answers. I also found this topic in sun's forums, http://forums.sun.com/thread.jspa?forumID=513&threadID=472453, but that's not satisfatory. Can someone give me some directions, material, articles or suggestion about the JVM scheduling algorithm ? I am also looking for information about the default configurations of Java threads in the scheduler, like 'how long does it take for every thread' in case of time-slicing. And this stuff. I would appreciate any help ! Thank you !

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Maven and db4o dependency

- by Jens Jansson

I'm intrigued to test new frameworks in the Java world, and decided to create a new project that takes advantage of Maven and db4o. I'm starting to get a hang of Maven, but I have a hard time adding db4o as a dependency to the project. First problem is that db4o doesn't exist in the official Maven repositories. Next up comes the problem that db4o seem to have recently restructured their whole site's URI:s, so I'm getting 'site not found' messages all the time when I try to navigate their site. I found somewhere a potential Maven repository that should be at https://source.db4o.com/maven but I get all the time "Error reading archetype catalog https://source.db4o.com/maven Unable to locate resource in repository" when I try to access it. So, any suggestions on how I'll get db4o up through Maven? I've managing Maven through Eclipse with the M2Eclipse plugin.

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ClassCastException in webclient

- by narendra

I am using web client for getting page source. First time i am getting page source. After i use the same object for getting page source for different URL it's showing an Exception like: java.lang.ClassCastException: com.gargoylesoftware.htmlunit.UnexpectedPage cannot be cast to com.gargoylesoftware.htmlunit.html.HtmlPage This is the code which i am using. HtmlPage firstPage = webClient.getPage("firsturl"); HtmlPage downloadPage = null; try { webClient.setJavaScriptEnabled(true); downloadPage = (HtmlPage) webClient.getPage("secondurl"); } catch (Exception e) { e.printStackTrace(); } Thx in advance

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Porting WebSphere code to get remote credentials to Tomcat

- by Glenn Lawrence

I have been asked to look into porting some code from a web app under IBM WAS 7 so that it will run under Tomcat 7. This is part of a larger SPNEGO/Kerberos SSO system but for purposes of discussion I have distilled the code down to the following that shows the dependencies on the two WebSphere classes AccessController and WSSubject: GSSCredential clientCreds = (GSSCredential) com.ibm.ws.security.util.AccessController.doPrivileged(new java.security.PrivilegedAction() { public Object run() { javax.security.auth.Subject subject = com.ibm.websphere.security.auth.WSSubject.getCallerSubject(); GSSCredential clientCreds = (GSSCredential) subject.getPrivateCredentials(GSSCredential.class).iterator().next(); return clientCreds; } }); I'd like to be able to do this in Tomcat.

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How useful is a 'pure' MVC implementation?

- by Matt1776

I work at a company that provides custom made 'CRM'-like software. We are currently redesigning/redeveloping the software with the hopes that it will look more modern and be easier to develop and customize for future clients. Currently it takes a long time to customize each new application. There is a presumption that the reason it takes so long is because of the amount of business logic that is present in the 'view' layer. To some extent I can vouch for this being true, but symptoms don't always reliably point out a cause. There was a suggestion that if we just move the business logic to the controller layer and use pure view (we use java J2EE and struts) as in implementing struts tags instead of calling the bean layer and iterating objects right on the jsp - etc etc. Before I start advocating we go forward with this, I wanted to get a feeling for what other people thought. Does a "pure" implementation of the MVC (especially emphasis on decoupling the controller and the view) provide a cleaner, easier to develop and change code base?

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XHTML editor wanted!

- by stolsvik

I need an editor that outputs clean HTML, and preferably strict XHTML with CSS, as I am going to display the resulting pages as help pages in a java application using xhmtlrenderer ("Flying Saucer") which apparently very much prefers XHTML with CSS 2.1. Having searched stackoverflow for HTML editor and XHTML editor, I've found several mentioned. Aptana is one, Eclipse's Web Tools is another, and KompoZer is a third. I am going to try these out. With this question, I ask whether there are other good options that would satisfy my requirements, and if there are any one of these mentioned or new ones that you'd recommend in particular, that I should focus a bit extra on?

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Programming Contest Question: Counting Polyominos

- by Martijn Courteaux

Hi, An example question for a programming contest was to write a program that finds out how much polyominos are possible with a given number of stones. So for two stones (n = 2) there is only one polyominos: XX You might think this is a second solution: X X But it isn't. The polyominos are not unique if you can rotate them. So, for 4 stones (n = 4), there are 7 solutions: X X XX X X X X X X XX X XX XX XX X X X XX X X XX The application has to be able to find the solution for 1 <= n <=10 PS: Using the list of polyominos on Wikipedia isn't allowed ;) EDIT: Of course the question is: How to do this in Java, C/C++, C#

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XMLEncoder and PersistenceDelegate

- by Johannes Rössel

I'm trying to use XMLEncoder to write an object graph (tree in my case) to a file. However, one class contained in it is not actually a Java bean and I don't particularly like making its guts publicly accessible. It's accessed more like a list and has appropriate add methods. I've already written a custom PersistenceDelegate to deal with that. However, is there any way for XMLEncoder to pick it up on its own or do I really need to add it whenever I use an encoder to write a graph that may contain said class?

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getResourceAsStream not loading resource

- by Michal Gorecki

The project that I am currently working on utilizes an old application contained within a .jar file. One of the responsibilities of this application is that it updates the database when changes to the configuration files are made. Every time I try to run this file (which is a simple Ant Task extension), I get an exception thrown early in the process. I decompiled the Java file responsible, and found that the exception being thrown happens here. I do not know what the issue is, as "hibernate.cfg.xml" is contained within the same .jar file as the .class throwing the exception. ClassLoader loader = Thread.currentThread().getContextClassLoader(); InputStream in = loader.getResourceAsStream("hibernate.cfg.xml"); if (in == null) { throw new RuntimeException("Couldn't find built in hibernate config"); } If anyone has any ideas, even pointing me in the right direction, I would be grateful. Of course, any solution will have to be external, as the client already has this build of the program in production use.

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Is it possible to shrink rt.jar with ProGuard?

- by PatlaDJ

Is there a procedure by which you can optimize/shrink/select/obfuscate only 'used by your app' classes/methods/fields from rt.jar provided by Sun by using some optimization software like ProGuard (or maybe other?). Then you would actually be able to minimize the download size of your application considerably and make it much more secure ? Right? Related questions: Do you know if Sun's "jigsaw project" which is waited to come out, is intended to automatically handle this particular issue? Did somebody manage yet to form an opinion about Avian java alternative? Please share it here. Thank you.

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Finding if a path between 2 sides of a game board exists

- by Meny

Hi, i'm currently working on a game as an assignment for school in java. the game cuurently is designed for Console. the game is for 2 players, one attacking from north to south, and the other from west to east. the purpose of the game is to build a "bridge"/"path" between the 2 of your sides before your opponent does. for example: A B C D E F 1 _ _ X _ _ _ 1 2 O X X _ _ _ 2 3 O X O O O O 3 4 O X O _ _ _ 4 5 X X _ _ _ _ 5 6 X O _ _ _ _ 6 A B C D E F player that attacks from north to south won (path/bridge from C to A) my problem is, what algorithm would be good to check if the user have managed to create a path (will be checked at the end of each turn). you're help would be very appreciated.

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Netbeans GUI Form corrupted?

- by hubpages-my

I was making a java gui application through netbeans IDE. All was working fine but yesterday when I opened the form in Netbeans, it said that the form had been corrupted and it could only open that form in read-only mode. When I opened that form in read-only mode, I found that the code was incomplete as severals lines of coding wasn't there at the end. Could anybody tell me how to recover the form. The form is perfect in lookwise but the generated code is incomplete. The code is too long to write it again. The Netbeans told me to get help from http://wiki.netbeans.org/FormGuardedBlockError but I didn't find any helpful information there.

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Client or server side invocation to google API?

- by Raffo

I'm writing a web application with GWT and I've to call google calendar's API to retrieve some information. I now have this dilemma: Is it better to use a client side invocation (using javascript or gwt-gdata library) or using the standard google library for java to call the service at server side and then passing all the data to the client via an async call?? I'm not able to understand pros and cons of the two approaches... In particular, I need to call several time the calendar API to retrieve events and let users add new ones, etc. Can you help me?

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Write a function in c that includes the following sequence of statements [Wont Compile]

- by Cody

There is a question in my programming languages textbook that is as follows: Write a C function that includes the following sequence of statements: x = 21; int x; x = 42; Run the program and explain the results. Rewrite the same code in C++ and Java and compare the results. I have written code, and played with it in all three languages but I can not even get it to compile. This includes declaring x above the three lines as well as in the calling function (as this question is obviously attempting to illustrate scoping issues) I'd like to explain the results and do the comparisons on my own, as it is an assignment question but I was wondering if anyone had any insight as to how to get this code to compile? Thanks

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Where to get 1440 free cron jobs a day?

- by Nok Imchen

I'm making a program for my own use. In this program, I need to set up cron job. The cron job should run every minute (24 hr * 60 mins = 1440 times). Thus, I'll need to set up a cron job with a frequency of 1 minute. I think Google App Engine gives free cron job. But I'm very new to it. I downloaded the java SDK and read the document but understood nothing :( So, I can't use Google App Engine. Is here any other free service like Google app engine which but with easier inferface??? All I want is a cron job with 1 minute frequency Please help/suggest me... Thank you

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How created method with signature as List

- by London

Hi all, I'm very new to Java programming language so this is probably dumb question but I have to ask it because I can't figure it out on my own. Here is the deal. I want to create method which extracts certain object type from a list. So the method should receive List as argument, meaning list should contain either Object1 or Object2. I've tried like this : public Object1 extractObject(List<?>){ //some pseudo-code ... loop trough list and check if list item is instance of object one return that instance } The problem with declaring method with List<?> as method argument is that I receive compilation error from eclipse Syntax error on token ">", VariableDeclaratorId expected after this token. How do I set the method signature properly to accept object types either Object1 or Object2 ? Thank you

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C++: Create abstract class with abstract method and override the method in a subclass

- by Martijn Courteaux

Hi, How to create in C++ an abstract class with some abstract methods that I want to override in a subclass? How should the .h file look? Is there a .cpp, if so how should it look? In Java it would look like this: abstract class GameObject { public abstract void update(); public abstract void paint(Graphics g); } class Player extends GameObject { @Override public void update() { // ... } @Override public void paint(Graphics g) { // ... } } // In my game loop: for (int i = 0; i < objects.size(); i++) { objects.get(i).update(); } for (int i = 0; i < objects.size(); i++) { objects.get(i).paint(g); } Translating this code to C++ is enough for me.

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Referring to a non-final variable data inside an inner class

- by shoaibmohammed

Im doing a program in GWT. Here is the snippet where Im having problem private String[] populateRSSData() { 1==>> String[] data = null; try { new RequestBuilder(RequestBuilder.GET, "../database.php?action=populaterss").sendRequest(null, new RequestCallback() { @Override public void onResponseReceived(Request request, Response response) { 2==>> data=response.getText().split("~"); } @Override public void onError(Request request, Throwable exception) { Window.alert(exception.getMessage()); } }); } catch (RequestException e) { Window.alert(e.getMessage()); } return data; } Now the problem arises that I get an error that the variable 1==>> data should be declared final. But if I declare it as final then i cannot store the datas in 2==>> The error i get Cannot refer to a non-final variable data inside an inner class defined in a different method RSS_Manager.java Please suggest

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JUnit4 + Eclipse "An internal error occured during Launching"

- by Mike

Hello I'm trying to run JUnit4 test cases on Eclipse 3.4.2 but it's not even starting for me. I am sure that I properly have junit-4.7.jar in my build path and the test application. Here is a simple example that illustrates my problem package test; import org.junit.Before; import org.junit.Test; public class UTest { @Test public void test() { } @Before public void setUp() throws Exception { } } This compiles fine Then I do "Run JUnit Test case" from Eclipse and I get an error dialog with this message "Launching UTest' has encountered a problem An internal error occurred during: "Launching UTest". java.lang.NullPointerException I'm not sure how to figure out what exactly generating this NullPointerException. Some pointers would be appreciated

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swing: event listener support class

- by Jason S

Is there any preexisting class that helps support add/remove EventListener operations? (kind of like PropertyChangeSupport) I'm trying to partition my code into a model and view in Java. I have some data that arrives erratically, and would like the model to support some kind of EventListener so that a view can subscribe to changes in the model. The data is numerous + complicated enough that I don't want to have to do the whole fine-grained Javabeans property change support; rather I would just like to allow notification that the model has changed in a coarse way. how can I best do this?

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Problem in generation of custom classes at web service client

- by user443324

I have a web service which receives an custom object and returns another custom object. It can be deployed successfully on GlassFish or JBoss. @WebMethod(operationName = "providerRQ") @WebResult(name = "BookingInfoResponse" , targetNamespace = "http://tlonewayresprovidrs.jaxbutil.rakes.nhst.com/") public com.nhst.rakes.jaxbutil.tlonewayresprovidrs.BookingInfoResponse providerRQ(@WebParam(name = "BookingInfoRequest" , targetNamespace = "http://tlonewayresprovidrq.jaxbutil.rakes.nhst.com/") com.nhst.rakes.jaxbutil.tlonewayresprovidrq.BookingInfoRequest BookingInfoRequest) { com.nhst.rakes.jaxbutil.tlonewayresprovidrs.BookingInfoResponse BookingInfoResponse = new com.nhst.rakes.jaxbutil.tlonewayresprovidrs.BookingInfoResponse(); return BookingInfoResponse; } But when I create a client for this web service, two instances of BookingInfoRequest and BookingInfoResponse generated even I need only one instance. This time an error is returned that says multiple classes with same name are can not be possible....... Here is wsdl..... <?xml version='1.0' encoding='UTF-8'?><definitions xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd" xmlns:wsp="http://www.w3.org/ns/ws-policy" xmlns:wsp1_2="http://schemas.xmlsoap.org/ws/2004/09/policy" xmlns:wsam="http://www.w3.org/2007/05/addressing/metadata" xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:tns="http://demo/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://schemas.xmlsoap.org/wsdl/" targetNamespace="http://demo/" name="DemoJAXBParamService"> <wsp:Policy wsu:Id="DemoJAXBParamPortBindingPolicy"> <ns1:OptimizedMimeSerialization xmlns:ns1="http://schemas.xmlsoap.org/ws/2004/09/policy/optimizedmimeserialization" /> </wsp:Policy> <types> <xsd:schema> <xsd:import namespace="http://tlonewayresprovidrs.jaxbutil.rakes.nhst.com/" schemaLocation="http://localhost:31133/DemoJAXBParamService/DemoJAXBParamService?xsd=1" /> </xsd:schema> <xsd:schema> <xsd:import namespace="http://tlonewayresprovidrs.jaxbutil.rakes.nhst.com" schemaLocation="http://localhost:31133/DemoJAXBParamService/DemoJAXBParamService?xsd=2" /> </xsd:schema> <xsd:schema> <xsd:import namespace="http://tlonewayresprovidrq.jaxbutil.rakes.nhst.com/" schemaLocation="http://localhost:31133/DemoJAXBParamService/DemoJAXBParamService?xsd=3" /> </xsd:schema> <xsd:schema> <xsd:import namespace="http://tlonewayresprovidrq.jaxbutil.rakes.nhst.com" schemaLocation="http://localhost:31133/DemoJAXBParamService/DemoJAXBParamService?xsd=4" /> </xsd:schema> <xsd:schema> <xsd:import namespace="http://demo/" schemaLocation="http://localhost:31133/DemoJAXBParamService/DemoJAXBParamService?xsd=5" /> </xsd:schema> </types> <message name="providerRQ"> <part name="parameters" element="tns:providerRQ" /> </message> <message name="providerRQResponse"> <part name="parameters" element="tns:providerRQResponse" /> </message> <portType name="DemoJAXBParam"> <operation name="providerRQ"> <input wsam:Action="http://demo/DemoJAXBParam/providerRQRequest" message="tns:providerRQ" /> <output wsam:Action="http://demo/DemoJAXBParam/providerRQResponse" message="tns:providerRQResponse" /> </operation> </portType> <binding name="DemoJAXBParamPortBinding" type="tns:DemoJAXBParam"> <wsp:PolicyReference URI="#DemoJAXBParamPortBindingPolicy" /> <soap:binding transport="http://schemas.xmlsoap.org/soap/http" style="document" /> <operation name="providerRQ"> <soap:operation soapAction="" /> <input> <soap:body use="literal" /> </input> <output> <soap:body use="literal" /> </output> </operation> </binding> <service name="DemoJAXBParamService"> <port name="DemoJAXBParamPort" binding="tns:DemoJAXBParamPortBinding"> <soap:address location="http://localhost:31133/DemoJAXBParamService/DemoJAXBParamService" /> </port> </service> </definitions> So, I want to know that how to generate only one instance(I don't know why two instances are generated at client side?). Please help me to move in right direction.

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What is a good practice to access class attributes in class methods?

- by Clem

I always wonder about the best way to access a class attribute from a class method in Java. Could you quickly convince me about which one of the 3 solutions below (or a totally different one :P) is a good practice? public class Test { String a; public String getA(){ return this.a; } public setA(String a){ this.a = a; } // Using Getter public void display(){ // Solution 1 System.out.println(this.a); // Solution 2 System.out.println(getA()); // Solution 3 System.out.println(this.getA()); } // Using Setter public void myMethod(String b, String c){ // Solution 1 this.a = b + c; // Solution 2 setA(b + c); // Solution 3 this.setA(b + c); } }

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What are the pro and cons of having localization files vs hard coded variables in source code?

- by corgrath

Definitions: Files: Having the localization phrases stored in a physical file that gets read at application start-up and the phrases are stored in the memory to be accessed via util-methods. The phrases are stored in key-value format. One file per language. Variables: The localization texts are stored as hard code variables in the application's source code. The variables are complex data types and depending on the current language, the appropriate phrase is returned. Background: The application is a Java Servlet and the developers use Eclipse as their primary IDE. Some brief pro and cons: Since Eclipse is use, tracking and finding unused localizations are easier when they are saved as variables, compared to having them in a file. However the application's source code becomes bigger and bloated. What are the pro and cons of having localization text in files versus hard coded varibles in source code? What do you do and why?

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Pros and cons of sorting data in DB?

- by Roman

Let's assume I have a table with field of type VARCHAR. And I need to get data from that table sorted alphabetically by that field. What is the best way (for performance): add sort by field to the SQL-query or sort the data when it's already fetched? I'm using Java (with Hibernate), but I can't tell anything about DB engine. It could be any popular relational database (like MySQL or MS Sql Server or Oracle or HSQL DB or any other). The amount of records in table can vary greatly but let's assume there are 5k records.

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I have applied a check for not allowing alphabets.But its not working.....

- by bhavna raghuvanshi

import java.util.Scanner; public class Main extends Hashmap{ public static void main(String[] args) { Hashmap hm = new Hashmap(); int x=0; Scanner input = new Scanner(System.in); do{ System.out.print("Enter any integer value between 1 to 12: "); x = input.nextInt(); }while(x<=0 || x>12); Scanner sc = new Scanner(System.in); //int number; do { while (!sc.hasNextInt()) { System.out.println("That's not a number!"); sc.next(); } x = sc.nextInt(); }while(x>=0); String month = hm.getEntry(x); System.out.println(month); } } here I need to restrict user from entering an alphabet.But its not working. pls help...

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