Jar File is running in my computer but not Running in another computer

Question

I created a jar file in my laptop and it runs fine in my computer without trouble but when i use the same in my friend's laptop it shows and exception and the file does not run. But it's still good with my laptop. What's the reason?

name of jar =BlueServer.jar it has only one class.
classname=Server.java one external library is used name=Bluecove.jar which is used for accessing bluetooth from java. Ide used=Eclipse used Eclipse for creating jar,already checked the option "Pacakage required libraries into generated jar"

This Error came while i try to run that same jar in another computer....

java -jar BlueServer.jar Exception in thread "main" java.lang.UnsupportedClassVersionError: Server : Unsupported major.minor version 51.0

    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
    at java.net.URLClassLoader.access$000(URLClassLoader.java:56)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
    at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:247)
    at org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader.main(JarRsrcLoader.java:56)

Then i have to check for each user of my jar have higher jdk or lower. Is there any general method so that i will not bother about the version of jdk of the user of that jar — Shekhar Kumar, Apr 14 '14 at 10:52
@ShekharKumar Not in general, but usually if you set the compiler to java 5 (aka 1.5) you should not have this problem anymore nowadays. — SebastianH, Apr 14 '14 at 11:14

score 0 · Answer 1 · edited May 23 '17 at 12:13

0

It is a problem with the version of the used JRE. See this post for details. Try

java --version

on both machines.

edited May 23 '17 at 12:13

Community

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answered Apr 14 '14 at 10:38

SebastianH

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score 0 · Answer 2 · edited May 23 '17 at 12:05

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This error indicates, that your file is not executable with the installed JRE version.

See How to fix java.lang.UnsupportedClassVersionError: Unsupported major.minor version for more info about that.

edited May 23 '17 at 12:05

Community

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answered Apr 14 '14 at 10:38

0x8BADF00D

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Then i have to check for each user of my jar have higher jdk or lower. Is there any general method so that i will not bother about the version of jdk of the user of that jar – Shekhar Kumar Apr 14 '14 at 10:52

yogesh · Answer 3 · 2014-04-14T10:48:47.640

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java.lang.UnsupportedClassVersionError happens because of a higher JDK during compile time and lower JDK during runtime. Make sure the jdk version installed in your laptop is equal or higher than your friend's.

edited Apr 14 '14 at 10:48

answered Apr 14 '14 at 10:38

yogesh

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Then how i know for each client have higher jdk or lower.. – Shekhar Kumar Apr 14 '14 at 10:49
Is there any general method so that i will not bother about the version of jdk of the user of that jar – Shekhar Kumar Apr 14 '14 at 10:50

Jar File is running in my computer but not Running in another computer

3 Answers3