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• Why can a class not be unloaded without unloading the classloader?

  - by Everyone

  The answer to 'unloading classes in java' says - "The only way that a Class can be unloaded is if the Classloader used is garbage collected." I took a look at the JLS but couldn't understand it Why is this the case?

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• Varying possible loss of precision

  - by szupie

  In Java, when you do int b; b = b + 1.0; You get a possible loss of precision error. But why is it that if you do int b; b += 1.0; There isn't any error?

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• How to create Binary Tree in a image(.jpeg)

  - by abc

  I have data structured in Binary tree format, i want to represent it into an image(*. jpeg) then i need to display that image on web page and all the data will come @ runtime, so image processing should be done @ runtime, how to do this ? This is what my thought solution any other suitable solution are also welcomed, web site is in .NET , i am thinking to produce image using java api then integrate it to .NET wither through WEB-SERVICE call or any other solutions are also welcomed.

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• Image.createImage problem in J2ME

  - by Michael

  Hi All, I tried this on J2ME try { Image immutableThumb = Image.createImage( temp, 0, temp.length); } catch (Exception ex) { System.out.println(ex); } I hit this error: java.lang.IllegalArgumentException: How do I solve this?

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• When you call remove(object o) on an arraylist, how does it compare objects?

  - by Thomas.Winsnes

  When you call remove(object o) on an arraylist in java, how does it compare the objects to find the correct one to remove? does it use the pointer? or does it compare the objects using the interface Comparable?

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• Force a delay on Ajax responses when using the App Engine eclipse plugin?

  - by Joren

  I'd like to increase the time it takes the ajax to return in order to test various animations. By default it takes ~3-5ms. Is there a way to force a delay? I'm using java.

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• Remember the values entered on standalone app on the client side

  - by kshtjsnghl

  We have a standalone java swing app, in which the user can print something that he drew, on a printer by giving its IP. Now the requirement is that the app needs to remember the ip that was given the last time by this user. What I could think of till now is (a brute one though) - keep a log file kind of storage on the client machine, and that everytime the app comes up it reads the last submitted one. Any suggestions would be helpful. Thanks in advance.

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• Projects with browsable source using dependency injection w/ guice?

  - by André

  I often read about dependency injection and I did research on google and I understand in theory what it can do and how it works, but I'd like to see an actual code base using it (Java/guice would be preferred). Can anyone point me to an open source project, where I can see, how it's really used? I think browsing the code and seeing the whole setup shows me more than the ususal snippets in the introduction articles you find around the web. Thanks in advance!

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• What is the best way to organize object oriented code?

  - by Adam

  I haven't coded in java for a long time, and after coding in C, I'm having issued organizing my code for OOP. More specifically I'm not sure when to create a new method, and when to create a new class, and when to just lump everything together. Are there some general rules or guidelines on how it should be done?

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• Printing user specified column from JTable

  - by technomage

  I have an application, and I would like to print a JTable, but since it has many columns, I would like user to select/limit which columns to print so it can fit in regular printer paper. I'm using JTable.print() function to print. (http://java.sun.com/docs/books/tutorial/uiswing/misc/printtable.html) Right now, my solution, is to create another JTable with the columns that user selected, then repopulate the table with the data, then send it to printer. Is there a better way to do it?

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• Does IBM Websphere 5.1.2 support jstl

  - by Suresh S

  Guys i have included jstl and standard.jar in lib directory under classpath. It says absolute uri http://java.sun.com/jstl is not found either in web.xml or in application. please let me know how to configure in websphere 5.1.2

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• Android Calendar API vs Calendar Provider API

  - by John Roberts

  I'm a little bit confused about the difference between the two. An example of the Calendar API is supposedly located here: http://samples.google-api-java-client.googlecode.com/hg/calendar-android-sample/instructions.html, but the author himself suggests using the Calendar Provider API, details about which are here: http://developer.android.com/guide/topics/providers/calendar-provider.html. Can someone explain to me the difference between the two, and which would be better for me to use for a simple calendar app?

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• How does JVM handles dynamic allocation

  - by Nile

  I want to understand how JVM manages heap for the dynamic allocations. Since every java program is invoked as a thread, when does JVM's garbage collector come into play. Also, how things work for javascript's dynamic allocation ?

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• ThreadPoolExecutor fixed thread pool with custom behaviour

  - by Simone Margaritelli

  i'm new to this topic ... i'm using a ThreadPoolExecutor created with Executors.newFixedThreadPool( 10 ) and after the pool is full i'm starting to get a RejectedExecutionException . Is there a way to "force" the executor to put the new task in a "wait" status instead of rejecting it and starting it when the pool is freed ? Thanks Issue regarding this https://github.com/evilsocket/dsploit/issues/159 Line of code involved https://github.com/evilsocket/dsploit/blob/master/src/it/evilsocket/dsploit/net/NetworkDiscovery.java#L150

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• Update function

  - by kosmaks

  Hello everyone! I try to learn java for android devices.. i have to create the update function. But still have one question: How???? in class root public void update(){ maindebug("update"); // This is my debug function } public void run(){ while(isRunning){ // isRunning is a boolean variable SystemClock.sleep(100); update(); } } and inside onCreate run(); but it doesnt work :(

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• Clean Stack Traces in Groovy using Eclipse?

  - by yar

  I am using Groovy in a Java Swing application as part of my plan to force-feed myself dynamic languages until I like them (which is happening, partly). My stack traces are filled with Groovy stuff like org.codehaus.groovy.runtime.callsite.ConstructorSite$ConstructorSiteNoUnwrapNoCoerce.callConstructor is there a way to get Eclipse to remove all of that codehaus stuff (filter stack traces, basically)? Edit: I can do this from the command-line with grep (well, not yet) so it's not so bad, but inside of Eclipse would be great too.

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• How to check if an IP address is the local host on a multi-homed system?

  - by MItch Branting

  For a machine with multiple NIC cards, is there a convenient method in Java that tells whether a given IP address is the current machine or not. e.g. boolean IsThisMyIpAddress("192.168.220.25");

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• What's your idea about transcript? Is it important?

  - by Mike Redford

  hi everyone I want to go the university for computer science faculty(java),what's your idea about this : Do you consider your transcript(s) of university-level work an accurate indication of your academic ability? Thanks a lot ...

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• in servlet Filter's method doFilter does not call

  - by khoyendra

  i have to create a program to login on facebook using example http://code.google.com/p/facebook-java-api/wiki/Examples but when i run project then i get my doFilter method does not call after complete init method please give me solution

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• Pattern for creating a database schema using JDBC

  - by Space_C0wb0y

  I have a Java-application that loads data from a legacy file format into an SQLite-Database using JDBC. If the database file specified does not exist, it is supposed to create a new one. Currently the schema for the database is hardcoded in the application. I would much rather have it in a separate file as an SQL-Script, but apparently there is now easy way to execute an SQL-Script though JDBC. Is there any other way or a pattern to achieve something like this?

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• How to fetch parameters when using the Apache Commons CLI library

  - by Mridang Agarwalla

  I'm using the Apache Commons CLI to handle command line arguments in Java. I've figured out my way around it to a decent extent but I need a little help. I've declared the a and b options and I'm able to access the value using CommandLine.getOptionValue. Usage: myapp [OPTION] [DIRECTORY] Options: -a Option A -b Option B How do I declare and access the DIRECTORY variable? Thank you.

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• Create all directories up to a point?

  - by Stefan Kendall

  I need to be able to build all directories up to and including the directory specified by my File object. For example, suppose I have something like this: File file = new File( "/var/a/b/c/d/" ); But only /var/ exists. I need a method that builds up to d, and I was wondering if there was a method in a java io library somewhere that does this already.

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• If I want to develop games that are interactive on a website and can communicate with the server, sh

  - by J Lynch

  If I want to develop games that are interactive and can communicate with the server, should I learn to program in Flash, SIlverlight, or Java?

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• I am faceing problem with this error of struts application.

  - by Sanjeev

  I am using My-eclipse and doing a struts project there is no syntax error but on starting tomcat server the following error appear in console. java.lang.ClassNotFoundException: org.apache.commons.logging.LogFactory and javax.servlet.UnavailableException: Parsing error processing resource path jndi:/localhost/strutspro/WEB-INF/struts-config.xml any idea whats the problem.

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• Is there a good NumPy clone for Jython?

  - by jbrogdon

  I'm a relatively new convert to Python. I've written some code to grab/graph data from various sources to automate some weekly reports and forecasts. I've been intrigued by the Jython concept, and would like to port some Python code that I've written to Jython. In order to do this quickly, I need a NumPy clone for Jython (or Java). Is there anything like this out there?

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