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• how to use a MySql database within Eclipse

  - by aadersh patel

  I am very new to programming, so please bear with me, and apologies in advance if at first I dont make sense...! I am doing an undergrad programming project, and need to make some databases within a Java program. I am using eclipse (galilo) to write my program. I have downloaded a connector/J, but havent the foggiest how i should use it! Anyone out there able to give me a step by step approach?! Many thanks!

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• JPanel in JFrame in NetBeans

  - by Gaurav

  I have created a Java application (project) in NetBeans, in which I have designed a JFrame with menu bar, and different JPanels. I want these JPanels to appear inside the JFrame on action of different menu items, so that whenever the menu items are clicked different JPanels should appear inside the JFrame. I have designed both JFrame & JPanel separately, but I couldn't link them together. Please help me out friends.

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• How to wire a verifier to a 2.0m5 Restlet using the spring extension and an xml config?

  - by Kevin Pauli

  I can't seem to find any example of how to do this. Imperatively in java it would be a piece of cake of course, but I can't seem to figure out how to inject my JaasVerifier into my SpringComponent declaratively from within the xml. It appears from the method signatures that Verifier is designed to be attached to Context, but the instance of Context itself is created as a side effect of the SpringComponent creation so I can't get a hold of it in Spring. There must be something I am missing.

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• Recursion inside while loop, How does it work ?

  - by M.H

  Can you please tell me how does this java code work? : public class Main { public static void main (String[] args) { Strangemethod(5); } public static void Strangemethod(int len) { while(len > 1){ System.out.println(len-1); Strangemethod(len - 1); } } } I tried to debug it and follow the code step by step but I didn't understand it.

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• XMLTask 1.16: Does it work with Ant so far?

  - by noelg103

  I'm trying to use XMLTask 1.16, but, unfortunately, I got error, java.lang.UnsupportedClassVersionError: Bad version number in .class file, all the time. But if I switch back to XMLTask 1.15, it work fine. Does anyone know how to make XMLTask 1.16 work with Ant.

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• Huffman coding two characters as one

  - by Adomas

  Hi, I need huffman code(best in python or in java), which could encode text not by one character (a = 10, b = 11), but by two (ab = 11, ag = 10). Is it possible and if yes, where could i find it, maybe it's somewhere in the internet and i just can'd find it?

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• How to recording the video of webcam using the JMF?

  - by Venkats

  I create java Media player and finished Video player, Audio Player, taking snapshot, etc., But i can only capture the video using webcam. I want to record the video in hard disk. What I have to do for that..? Thanks in Advance.

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• mapping Field with variable type using Hibernate Annotaion

  - by Zahra

  Hi. how can I have a field with variable type in my class? I use hibernate annotation for mapping to DB. I tried to use java.io.Serializable as field's type, but it mapped to database as a 01 amount which is true if I get it's object and cast it to it's true type. but I need to run a query on this objects that needs true amount of field.(right now I can't compare an integer field with a number) Does anyone have any idea how can I do this? Thanks in advance.

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• Convert .jar to an OSX executable?

  - by Danny King

  Hello, I made a Java application which I would like to distribute on Windows, OSX and Linux without distributing a jar file. I used the great Windows exe wrapper http://launch4j.sourceforge.net/ to create an .exe file complete with my icon that won't scare Windows users. Are there similar wrappers that I can use for OSX/Unix? An important consideration is that I would like to have my own icon on the executable (especially for mac users). Thanks!

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• Word documents generation in web app using Eclipse BIRT Report Engine

  - by Orr151

  Hi, Is it possible to generate word documents (*.doc) in java web application using Eclipse BIRT (Report Engine)? I want .rptdesign to be an input file in generating process. I could not find any example or tutorial. What would you recommend as an alternative solution. As far as I know Jasper Reports allow only RTF format generation. Thank you for your answer/explaination

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• Why sockets does not die when server dies? Why socket dies when server is alive?

  - by Roman

  I try to play with sockets a bit. For that I wrote very simple "client" and "server" applications. Client: import java.net.*; public class client { public static void main(String[] args) throws Exception { InetAddress localhost = InetAddress.getLocalHost(); System.out.println("before"); Socket clientSideSocket = null; try { clientSideSocket = new Socket(localhost,12345,localhost,54321); } catch (ConnectException e) { System.out.println("Connection Refused"); } System.out.println("after"); if (clientSideSocket != null) { clientSideSocket.close(); } } } Server: import java.net.*; public class server { public static void main(String[] args) throws Exception { ServerSocket listener = new ServerSocket(12345); while (true) { Socket serverSideSocket = listener.accept(); System.out.println("A client-request is accepted."); } } } And I found a behavior that I cannot explain: I start a server, than I start a client. Connection is successfully established (client stops running and server is running). Then I close the server and start it again in a second. After that I start a client and it writes "Connection Refused". It seems to me that the server "remember" the old connection and does not want to open the second connection twice. But I do not understand how it is possible. Because I killed the previous server and started a new one! I do not start the server immediately after the previous one was killed (I wait like 20 seconds). In this case the server "forget" the socket from the previous server and accepts the request from the client. I start the server and then I start the client. Connection is established (server writes: "A client-request is accepted"). Then I wait a minute and start the client again. And server (which was running the whole time) accept the request again! Why? The server should not accept the request from the same client-IP and client-port but it does!

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• com.mysql.jdbc.Driver classnotfoundException

  - by Mohammed_Q

  Im getting classnotfountexception on Class.forname("com.mysql.jdbc.Driver") im using: windows vista 64-bit, Eclipse Galileo, GWT framework i downloaded (mysql-connector-java-5.1.6-bin), but what the exact path i should add to. im getting this exception while im in gwt-projects, but normal projects working good, any idea how that should be done???...thanks

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• Data binding library with support for generics and SWT/JFace?

  - by Alexey Romanov

  JFace Databinding doesn't support generics, so it isn't particularly type-safe. And apparently it never will, since they wish to preserve Java 1.3 support. JGoodies supports generics since 2.0.0. Has anyone ported JGoodies 2 to SWT/JFace? Or is there another library which allows both?

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• Elegant way to code if (10 < x < 20)

  - by Danny King

  Hi, Is there an elegant way in Java to code: if (10 < x < 20) { ... } i.e. "if x is between 10 and 20" rather than having to write if ((x > 10) && (x < 20)) { ... } Thanks!

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• Which pattern is good for bullets hit test in game that need server validates ?

  - by Konami.Koumura

  I would like to design a PvP game uses flash in client and java socket server, but I do need server validates trajectory and if bullets hit target from cheating. Is there any tutorial or paper provides how to do this ?

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• How can I find out at runtime what garbage collection algorithm is configured in my JVM?

  - by kweiner

  I have an instance of Tomcat 6.0.18 running on Sun's Java HotSpot(TM) Server VM build 1.6.0_14-b08. Is there any way for me to find out what garbage collection algorithm the JVM is using to run my web application?

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• Any PHP or Python alternatives for Liferay and Alfresco ?

  - by Jim

  Hello, My company wants to use Liferay for developing a portal and integrate Alfresco with it for document management. But both Liferay and Alfresco are Java based and i would like to know if there are any alternatives to Liferay and Alfresco in PHP or Python. Thank You

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• Why does javac complain about not initialized variable?

  - by Marcus

  For this Java code: String var; clazz.doSomething(var); Why does the compiler report this error: Variable 'var' might not have been initialized I thought all variables or references were initialized to null. Why do you need to do: String var = null; ??

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• Converting back from toString to Object

  - by MontyBongo

  Is there any way to covert from toString back to the object in Java? For example: Map<String, String> myMap = new HashMap<String, String>(); myMap.put("value1", "test1"); myMap.put("value2", "test2"); String str = myMap.toString(); Is there any way to convert this String back to the Map?

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• whiteboard application

  - by alice

  Hi..i wanted to develop a whiteboard application..i know the basics of java..but have no idea where to start from..so..i'd really appreciate if you could guide me..as in..where do i start from??

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• whiteboard application

  - by alice

  Hi..i wanted to develop a whiteboard application..i know the basics of java..but have no idea where to start from..so..i'd really appreciate if you could guide me..as in..where do i start from??..plz...i reallly need ths..

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• finally and return

  - by abson

  In the below example, class ex8 { public void show() { try { int a=10/0; return;} catch(ArithmeticException e) { System.out.println(e); return ;} finally { System.out.println("Finally"); } } public static void main(String[] args) { new ex8().show(); } } the output is: java.lang.ArithmeticException: / by zero Finally How is it that Finally gets printed in spite of return statement in catch?

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• What's the host param in applets for if when we can use codebase?

  - by Bassel Alkhateeb

  what's are the uses of the host param with java applets? can it be tricked to use a different server than the originating server? I didn't find a clear complete explanation of the host param.

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• How do I get the Source IP of a SOAP requesting client machine?

  - by lavanya-halliwell

  how do you get source ip, username, password, etc... of the client machine that sends a soap request? is there any of these details that one can pull for logging purposes? I am using Java to handle the incoming SOAP requests. The service simply adds 2 numbers and is working, but I just need to get some client details. Thanks, Lavanya

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• Conditional operator in if-statement?

  - by Pindatjuh

  I've written the following if-statement in Java: if(methodName.equals("set" + this.name) || isBoolean() ? methodName.equals("is" + this.name) : methodName.equals("get" + this.name)) { ... } Is this a good practice to write such expressions in if, to separate state from condition? And can this expression be simplified?

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