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• Java socket close timeout

  - by Shayan

  In java when you close a socket it doesn't do anything anymore but it actually closes the tcp connection after a timeout time. I need thousands of sockets and I want them to be closed exactly after closed them not after wasting my time and my resources! What can I do? Thank you.

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• Java force catch RuntimeException?

  - by wuntee

  Is it possible to force java to make you catch RuntimeExceptions? Specifically I am working with the Spring framework and the whole Exception hierarchy is based upon RuntimeExceptions. A lot of the times I forget to try and catch the Exceptions. A specific example is when doing an LDAP query, or an SQL call.

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• lightweight publish/subscribe framework in java

  - by mdma

  Is there a good lightweight framework for java that provides the publish/subscribe pattern? Some ideal features Support for generics Registration of multiple subscribers to a publisher API primarily interfaces and some useful implementations purely in-memory, persistence and transaction guarantees not required. I know about JMS but that is overkill for my need. The publish/subscribed data are the result of scans of a file system, with scan results being fed to another component for processing, which are then processed before being fed to another and so on.

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• How to create .exe file for java project.

  - by Manu

  hi all How to create .exe(executable)file for java project?. thanks for your help in advance.

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• java database backup restore

  - by jawath

  how do i backup /restore any kind of databases inside my java application to flate files.Are there any tools framework available to backup database to flat file like CSV, XML,or secure encrypted file,or restore from csv or xml files to databases ,it should be also capable of dumping table vise restore and backup also

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• Java equals and hashmaps problem

  - by johan001

  So I'm learning Java and I'm trying to understand equals, but I really don't understand it. So my question is: how does equals works? Thanks

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• How to add two java.lang.Numbers?

  - by amit.dev

  I have two Numbers. Eg: Number a = 2; Number b = 3; //Following is an error: Number c = a + b; Why arithmetic operations are not supported on Numbers? Anyway how would I add these two numbers in java? (Of course I'm getting them from somewhere and I don't know if they are Integer or float etc).

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• How to determine a random int between 1 and 800 in java

  - by Charlie

  I feel like this is trivial, but my brain is not functioning. How can I generate a random integer between 1 and 800 in Java?

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• How to convert dwg file to jpeg or gif format using java api or .net library

  - by magh

  How can be autocad file (dwg) converted to jpeg or gif file using java api or or .net library. Without using the convertors Thanks in advance

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• Window z-ordering in java

  - by Aaron

  Is there a way to manage the window z-ordering of JDialog windows within java? I would like to able to assign each window to a layer such that windows on lower layers can never go above and obscure windows on higher layers. Even when they have focus. Similar to the Z-order capability that exists for components but for JDialog windows. The solution does not need to work across all OSes. A linux specific solution is acceptable.

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• string recieve with utf8 format but have problem in java

  - by zahir hussain

  hi i want to know how to receive the string from file in java... that file have different language letters... i used UTF-8 format... this can receive some language letters correctly... but Latin letters cant display correctly... so how can i receive all language letters... or any other format for receive all language letters... thanks and advance

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• I write bad wave files using Java

  - by Cliff

  I'm writing out wave files in Java using AudioInputStream output = new AudioInputStream(new ByteArrayInputStream(rawPCMSamples), new AudioFormat(22000,16,1,true,false), rawPCMSamples.length) AudioSystem.write(output, AudioFileFormat.Type.WAVE, new FileOutputStream('somefile.wav')) And I get what appears to be corrupt wave files on OSX. They won't play from Finder however using the same code behind a servlet writing directly to the response stream and setting the Content-Type to audio/wave seems to play fine in quicktime. What gives?

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• return type of main in java

  - by girinie

  Hi I like to know why only void return type for main method in java. public static void main(String [] args) Why there is no other return types other than void for main method. Thanks

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• java interfaces

  - by Codenotguru

  write an interface with one method,two classes that implement the interface, and a main method with an array holding an instance from both classes.Using this array variable call the method in a foreach loop.This is a interview question in java anybody?

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• difference between hashmap and array list in java?

  - by Venkats

  In java, ArrayList and HashMap are using in collections. But i couldn't understand at which situations we should use ArrayList and which time use HashMap. What is the major difference between both of them?

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• Java - Runtime.getRuntime().exec() what's going on?

  - by kunkanwan

  Hi, I have problem with Runtime.exec() in Java My code: String lol = "/home/pc/example.txt"; String[] b = {"touch", lol}; try { Runtime.getRuntime().exec(b); } catch(Exception ex) { doSomething(ex); } It's working good but when I trying changle variable "lol" files doesn't create in hard disk for instance: String lol = x.getPath(); where getPath() returns String What should I do ? Thanks for your reply :)

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• data mining open source software in java

  - by pat

  Hi i just like to know is there any open source data mining software written in java that is approximately less than 3k lines of codes? If yes, please give download link i need to do software testing thank you.

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• Profiling short-lived Java applications

  - by ejel

  Is there any Java profiler that allows profiling short-lived applications? The profilers I found so far seem to work with applications that keep running until user termination. However, I want to profile applications that work like command-line utilities, it runs and exits immediately. Tools like visualvm or NetBeans Profiler do not even recognize that the application was ran. I am looking for something similar to Python's cProfile, in that the profiler result is returned when the application exits.

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• how to build dynamically a Java classpath in Perl

  - by joe

  For Example in shell script : _CLASSPATH =. for jar in lib/*.jar do _CLASSPATH=${_CLASSPATH}:${jar} done how to build dynamically a Java classpath in Perl ?

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• Java: How to get a classpath for current process

  - by phil swenson

  when I call System.getProperty("java.class.path") I only get this: /Users/pswenson/dev/sag/gradle-0.8/lib/gradle-core-0.8.jar The other classes in question are loaded at dynamically. Any ideas on finding the full classpath?

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• parallel java libraries

  - by jetru

  I'm looking for Java libraries/applications which are parallel and feature objects that can be queried in parallel. That is, there is/are objects in which multiple types of operations can be made from different threads and these will be synchronized. It would be helpful if someone could ideas of where I could find such applications as well. EDIT: Actually, language doesn't matter so much, so C++, Python, anything is welcome

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• Free Java library for converting existing PDF to PDF/A

  - by Shervin

  Hi. I am trying to convert PDF to PDF/A. Currently I can do this using OpenOffice pdf viewer plugin together with Jodconverter 2. But this is pretty cumbersome to do. Does anybody of any open source / free Java libraries I can use to do this.

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• Hide Java application from command-tab application switcher in OSX

  - by mystro

  I have a java application that has an icon in the tray of the menu bar at the top of OSX. I've been able to remove the icon from the dock when the application is "minimized to tray", but it still appears when I command-tab to switch between my running applications. I'd like to hide it from there too, but I'm not sure how to do that, so I would appreciate any advice Thanks!

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• Java Robot class and UAC

  - by bml13

  I am using the Java Robot class to take screenshots, my problem is that in W7 when the UAC dialog is shown (i right click on any application and select run as Admin) it will not appear in the screen shot or the whole screen is just black. Running my application with admin rights or as a service does not solve the problem. Please, does any one know what to do so that i will be able to capture the screen even when the UAC is showing? Thanks

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• Concurrent Linked HashMap java

  - by Nilesh

  Please help me use/create Concurrent LinkedHashMap. As per my belief, if I use Collections.synchronizedMap(), I would have to use synchronized blocks for getter/setter. If I use ConcurrentSkipListMap, is there any way to implement a Comparator to store sequentially. I would like to use java's built in instead of third party packages. Thanks

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