UnsupportedClassVersionError when using Java 5.0

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brightoceanlight@hotmail.com - 02 Nov 2005 15:28 GMT

I installed a new version of java, 5.0 and tried to run my application
with the new java version but get the following error :

java.lang.UnsupportedClassVersionError: MyServer (Unsupported
major.minor version 49.0)
    at java.lang.ClassLoader.defineClass0(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:539)
    at
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:251)
    at java.net.URLClassLoader.access$100(URLClassLoader.java:55)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:194)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:187)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
    at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
Exception in thread "main"

The program runs fine with 1.4.2, but fails with 5.0.

Could anyone suggest what might be wrong?

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Roedy Green - 02 Nov 2005 15:53 GMT

>java.lang.UnsupportedClassVersionError

see
http://mindprod.com/jgloss/runerrormessages.html#UNSUPPORTEDCLASSVERSIONERROR

Signature

Canadian Mind Products, Roedy Green.
http://mindprod.com Java custom programming, consulting and coaching.

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brightoceanlight@hotmail.com - 02 Nov 2005 16:32 GMT

A way to fix the problem :

In Eclipse ->Window->Preferences

Then under the tree : Java->Compiler

When you set Compiler compliance level : to 5.0

then under tree : Java->Installed JREs, need to add location of new jre
and then select the jre so it is checked.

This fixes the problem.

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UnsupportedClassVersionError when using Java 5.0

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