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• Why are all the tabs except MBeans disabled in JConsole?

  - by Kem Mason

  I'm trying to connect to JConsole on a server running: java version "1.6.0_0" OpenJDK Runtime Environment (IcedTea6 1.4.1) (6b14-1.4.1-0ubuntu12) OpenJDK 64-Bit Server VM (build 14.0-b08, mixed mode) from my local machine, running: java version "1.6.0_24" Java(TM) SE Runtime Environment (build 1.6.0_24-b07-334-10M3326) Java HotSpot(TM) 64-Bit…

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• Running 32bit eclipse on 64bit windows.

  - by james

  I am trying to use a 32bit installation of eclipse on my 64bit windows machine. I have eclipse extracted to my C: Drive and Java installed in ProgramFiles(x86) When I go to start eclipse I get the error:Failed to load the JNI shared Library"C:Program Files(x86)\Java\jre6\bin\jvm.dll" I looked and the file is not there. I am setting…

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• Adding a jar file to CLASSPATH is still not executable

  - by Simon O'Hanlon

  Perhaps I just don't understand how the whole CLASSPATH environment variable works when trying to find .jar files on your system. I thought if you specified it, you could launch .jar files with java in much the same way that you can launch executables that are on your path. I have an executable java archive (.jar file) on my system,…

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• "Error occurred during initialization of VM" in linux server

  - by Khoyendra Pande

  I am trying to run java command in linux server it was running well but today when I tried to run java I got some error- Error occurred during initialization of VM Could not reserve enough space for object heap Could not create the Java virtual machine. my memory space is - root@vps [~]# free -m total …

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• Stop jucheck from running

  - by Ken

  I've installed Java on Windows Vista, and every day I get a Vista security warning asking me if I want to run "jucheck". Apparently this is the Java automatic updater. Well, I don't want it to run on its own, ever. I cancel it, and quit it. I right-click on the taskbar and unclick "Check for Updates Automatically", and then click…

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• JVM disappeared on Mac OS X Snow Leopard 10.6.8

  - by weisjohn

  I'm working in Eclipse one night, (also using Android's DDMS from the commandline). The next morning, I open the lid... attempt to run Eclipse and get an error. me$ sudo /Applications/eclipse/eclipse JavaVM: requested Java version ((null)) not available. Using Java at "" instead. JavaVM: Failed to load JVM:…

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• How to make an x.509 certificate from a PEM one?

  - by Ken

  I'm trying to test a script, locally, which involves uploading a file using a Java-based program to a FileZilla FTPES server. For the real thing, there is a real certificate on the FZ server, and the upload step (tested alone) seems to work fine. I've installed FileZilla Server on my dev box (so it'll test…

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• Glassfish v3 failure when startup. "Cannot allocate memory "

  - by Shisoft

  It is clear in this Question Fail to start Glassfish 3.1: java.io.IOException: error=12, Cannot allocate memory But in my case,I have a 512M memory Ubuntu 10.04 vps.It seems that I don't need to change any configure.But when start the server,I got this exception VM failed to start:…

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• log4j-1.2.8.jar gets deleted from the path when a Webservice is created from Eclipse

  - by Seema

  When I try to create a Webservice from Eclipse, the log4j-1.2.8.jar which is configured in the project's build path just gets deleted, and when I try to invoke the Webservice it gives error as below: 2014-06-05 11:47:48,742 ERROR ServiceRequester:55 - RemoteException 2014-06-05…

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• Top - what does Virtual memory size mean? ...linux/ubuntu

  - by user42159

  I am running Top to monitor my server performance and 2 of my java processes show virtual memory of upto 800MB-1GB. Is that a bad thing? What does virtual memory mean? And oh btw, I have swap of 1GB and it shoes 0% used. So I am confused. Java process = 1 Tomcat server + my…

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• Does anybody know how to make Snow Leopard recognize JVMs before 1.6

  - by Angel

  I can only see 1.6.0 (32 and 64bit) on the Java Preferences dialog, and I need it to run applications using Java 1.5.0

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• Get SMTP to work

  - by user664408

  We upgraded to exchange 2010 and this broke an old java based script that connected and sent out e-mail messages. Many hours later we still can't get exchange to work like exchange 2003 did. That hope was abandoned and we decided to create a linux postfix server to forward…

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• Where can I find MSVM-specific applets?

  - by math

  For a specific project, I need to install and test the (now discontinued) Microsoft Java VM. But now that it is installed, I'm unable to find any applet which still work or require the Microsoft Java VM on the net... Do you know any site where I can access Java applets…

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• Where is the Java Language Conversion Assistant (JLCA) 3.0?

  - by David Pfeffer

  Microsoft supposedly offer(ed?) something called the JLCA, which converts Java into C#. I can't find any download or anything for it. Does anyone have any information about this tool and how to use it in VS2008/2010? I can find version 2.0 but not 3.0... supposedly it…

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• Is there a non-type-erased generics extension to the Java Compiler available as a 3rd party library?

  - by Chris

  I'm becoming increasingly frustrated with the limits of type-erased Java generics. I was wondering if there was a library that provided a full version of generics without the quirks associated with type-erasure? Chris

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• How to get the capacity of the ArrayList in Java?

  - by JavaUser

  Hi, Its known that Java ArrayList is implemented using arrays and initializes with capacity of 10 and increases its size by 50% . How to get the current ArrayList capacity not the Size of the ArrayList. Thx

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• Is there a standard constant in Java used to refer to HTTP request methods?

  - by user167019

  I'm looking for a Java string constant to refer to HTTP request methods (GET, POST, PUT, etc.). I expected HttpServlet or HttpServletRequest to have constants for these methods, but that doesn't seem to be the case.

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• Java Program Specialization - What is it? I don't understand it..

  - by KP65

  I'm reading about program specialization - specifically java and I don't think I quite understand it to be honest. So far what I understand is that it is a method for optimizing efficiency of programs by constraining parameters or inputs? How is that actually done?…

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• What does it mean for a method to be public/private/other in java?

  - by David

  What does it mean for a method to be public/private/other in java? What are the advantages and disadvantages of these options? What is my impetus, as someone trying to be a good programmer, to care?

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• Is there an iconv with //TRANSLIT equivalent in java?

  - by Keith

  Is there a way to achieve transliteration of characters between charsets in java? something similar to the unix command (or similar php function): iconv -f UTF-8 -t ASCII//TRANSLIT < some_doc.txt > new_doc.txt preferably operating on strings, not having…

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• How can I create a PFX file from a Java Keystore?

  - by Christian Berg

  I have a Java keystore (.jks file) holding a single certificate. How can I create a .pfx file from this keystore?

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• How to obtain position in file (byte-position) from java scanner?

  - by september2010

  How to obtain a position in file (byte-position) from the java scanner? Scanner scanner = new Scanner(new File("file")); scanner.useDelimiter("abc"); scanner.hasNext(); String result = scanner.next(); and now: how to get the position of result in file (in…

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• Google App Engine - "java.lang.IllegalArgumentException: datastore transaction or write too big."

  - by Keyur

  When calling DatastoreService.delete(keys) with 400 keys, I'm get this exception: java.lang.IllegalArgumentException: datastore transaction or write too big. I thought the limit on batch deletes was 500 so I am well under the limit. Am I missing something…

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• How do I programmatically determine operating system in Java?

  - by KG

  I would like to determine the operating system of the host that my Java program is running programmatically (for example: I would like to be able to load different properties based on whether I am on a Windows or Unix platform). What is the safest way to do…

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• Is there a library for Linear algebra matrix handling in Java?

  - by Mario Ortegón

  Is there any libraries in java that allow using mathematical matrices? I am looking for a library that allows me to perform operations in matrices such as invert, scalar multiplication, linear transformations, etc. etc. etc. In a nutshell, the operations…

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