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• Why does this code sometimes throw a NullPointerException?

  - by Tiberiu Hajas

  Consider the following Java source: if( agents != null ) { for( Iterator iter = agents.keySet().iterator(); iter.hasNext(); ) { // Code that uses iter.next() ... // } } The agents is a HashMap. Why does the for statement sometimes throw a NullPointerException? Thank you.

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• UML Diagram Tool - Eclipse plug in?

  - by KP65

  Can anyone help me? I am currently using eclipse java ide, and would like a plug-in that will automatically look at my classes and draw up a class diagram in UML. any suggestions?

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• Struts 1.1 - No bean specified Error

  - by Ruepen

  What would the possible scenarios be in which I would get this error produced from a struts web app? java.lang.IllegalArgumentException: No bean specified

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• Adding images to a JAR file in Eclipse?

  - by ChrisFreeley

  I'm trying to make a game in java, but I'm a bit of a newb. The game has images, and when I run the application from eclipse, they all show up fine. But when I export the project as an application, the images don't show up. When I put the application in the same folder as the images, they show up when I run the application, so someone suggested that I just need to put the image files inside my JAR. Can someone tell me how? Thank you

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• How to set JFrame to appear centered, regardless of the Monitor resolution

  - by AmateurProgrammer

  While working in Java, I find it hard to position my Main application window in the very center of the screen when I start the application. Is there any way I can do that? I tried with some of the predefined methods but none worked. BTW it doesn't have to be vertically centered, horizontal alignment is the more important goal for me. But vertical alignment is also welcome. Thanks

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• Why are dates calculated from January 1st, 1970 ?

  - by Vijay Shanker

  Is there any reason behind using date(January 1st, 1970) as standard for time manipulation? I have seen this standard in Java as well as in Python. These two languages I am aware of. Is other popular languages also follows the same standard? Please describe.

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• How to debug a JSP tomcat service using eclipse?

  - by user10402

  I would like to debug my separately running JSP/Struts/Tomcat/Hibernate application stack using the Eclipse IDE debugger. How do I setup the java JVM and eclipse so that I can set breakpoints, monitor variable values, and see the code that is currently executing?

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• Can JAX-WS host "web" service in desctop program?

  - by Fan

  Can Java (JAX-WS) host "web" service in desctop program? For example .net wcf can host services anywhere. Tnx all.

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• How to identify which server side script language is using with a web site?

  - by Leo

  How to identify which server side script language was used with a web site? Asp.Net? PHP? RoR? Java? or other? For example, Which server side script language was used with stackoverflow.com?

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• JVM hs_err.log not being generated on Linux

  - by halfwarp

  Hello, I'm currently having some issues with a Java application I'm developing. Namely the JVM is crashing with a segfault. I'm trying to locate the hs_err.log file which should contain some helpful info about the issue. However, I can't find this file. I've used find, locate, etc, and nothing. Any ideas on why the log file isn't being generated?

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• Redirect to login page automatically after some time

  - by ASD

  How can we redirect to login page automatically after some time? I have a requirement to redirect to login page if the current page is idle for 10 minutes in Java/JSP. I tried to use <meta http-equiv="refresh" content="120;url=./login.html"> tag. This works only when I click on any link but not automatically after 2 mins(120secs). Can anyone tell me how to redirect to login page automatically?

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• GAE/J datastore backup

  - by jb

  What is the easiest way to do a GAE/J datastore backup? It looks like there is python bulkloader.py tool to do backup for Python apps, but what should I do to backup Java app? Is there any way to use python tool?

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• Convert normal web service to wcf

  - by zachary

  I have a normal web service. Many java and .net users are accessing it. Can I update it to wcf without anyone having to change their code? Any tutorials?

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• Where can I find a good introductory tutorial for Spring?

  - by will

  I am a Java developer but up to now have not had any hands on experience using the Spring framework. Does anyone know of anyone good online tutorials that explain the basics and offer good examples and sample code.

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• How to I "scan" a website(or page) for info, and bring it into my program?

  - by James

  Well, I'm pretty much trying to figure out how to pull information from a webpage, and bring it into my program(in Java). For example, if I know the exact page I want info from, for the sake of simplicity a Best Buy item page, how would I get the appropriate info I need off of that page? Like the title, price, description? What would this process even be called? I have no idea were to even began researching this :'(

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• Run Jar in Background on Linux

  - by Benny

  I have a jar that runs forever (infinite loop with socket listening thread) and need it to run in the background at all times. An example would be: "java -jar test.jar" How do I do this? Thanks in advance!

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• How do I make the main window to react to a table click

  - by Ayelet

  I am a new user of Java swing. I need to be able to create a popup with row info when the user clicks on that row. I managed to incorporate the mouseClick event reaction in my table class, and I have the row info available. But I don't know how to notify the main window about the event so it can display the dialog box/popup box. Can you help me?

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• How to run solr on a windows server so it starts up automatically?

  - by Blankman

  How can I run solr on a windows server, so it starts up automatically? I run it with: java -jar start.jar but I need the server to do this automatically.

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• j2ee good and reliable books

  - by user161004

  Can anybody suggest some good books for starting J2EE? I have done Core and Advanced Java ( up to Swing).

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• Detect and remove noise text

  - by yox

  Given a database table with lots of data in it, what is the best practice to remove noise text? I want to detect and remove strings like: fghfghfghfg qsdqsdqsd rtyrtyrty I'm using Java.

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• Last substring of string

  - by javaguy

  In java we have indexOf and lastIndexOf. Is there anythink like lastSubstring? It should work like : "aaple".lastSubstring(0, 1) = "e";

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• Get all characters from a string with their number

  - by terence6

  How in Java can I get list of all characters appearing in string, with number of their appearances ? Let's say we have a string "I am really busy right now" so I should get : i-2, a-2, r-2, m-1 and so on.

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• Null pointer exception on .iterator() call

  - by Peter

  I'm getting a strange NullPointerException, evidently thrown by the following line of code: Iterator<Note> it = notes.iterator(); I've checked, and at the time the java.util.TreeSet notes is always non-null (with 15 elements). The TreeSet API says nothing about iterator() throwing NullPointerExceptions. What else could be going here?

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• Network Differences

  - by Chris

  I am busy working on a java app to run on blackberries but on some devices i am testing on, the code does not seem to be working and im having a hard time pinpointing where the problem lies. My question is: Could the problem with some phones working and not working have t odo with the type of network they are running on such GSM vs CDMA and would the code that stops working on some devices be in one of the following areas: 1) Listeners - such as MessageListener and Phone Listener 2) UI Objects - simple test labels and buttons 3) Connection to a web service using ksoap2

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• best software synthesizer for piano

  - by pianoman

  Could someone recommend a good and inexpensive software synthesizer which generates really good piano sound (sample-based); support for other instruments is not required. OS: Windows or MacOS. Java interface would be a great asset.

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