UnsupportedClassVersionError

[Sunny Gibbony]

I am getting this error when I run my master.bat file. I've checked the jdk class path and it looks fine. Has anyone seen this before?


run specialties load .bat BEGIN...
Exception in thread "main" java.lang.UnsupportedClassVersionError: example/SpecialLoader (Unsupported major.minor version 49.0)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
run specialties load .bat COMPLETED

run zone inspection load .bat BEGIN...
Exception in thread "main" java.lang.UnsupportedClassVersionError: example/InspectionLoader (Unsupported major.minor version 49.0)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
run zone inspection load .bat COMPLETED

run all .bat files COMPLETED
Press 'Enter' to exit...

[Norm Radder]

Looks like the class file was compiled with a younger version of java than you are using to execute it. Check that the java program is as young as the javac program used to compile it.

[Vilmantas Baranauskas]

When compiling a java class, version number is included in each *.class file:

major version: 48 = Java SE 1.4.2
major version: 49 = Java SE 5
major version: 50 = Java SE 6

Your classes have been compiled on java 5, and you try to run them on Java <=1.4.

[Jesper de Jong]

Try searching in the forums or with Google for "UnsupportedClassVersionError" - this has been discussed before.

[Sunny Gibbony]

Yes there are alot of perivous posts about this. It looks like maybe the JVM is older than the compiler. What is the command/process to check the version of the JVM or JRE?

[Balasubramanian Chandrasekaran]

Originally posted by Ashlon Hill:
What is the command/process to check the version of the JVM or JRE?

To know version of your JDK you can use
%>javac -version

To know version number of your JRE you can use
%>java -version
in your Command Prompt(Terminal)
[ July 10, 2008: Message edited by: Balasubramanian Chandrasekaran ]

[Sunny Gibbony]

Yes that is correct.

it was trying to use java 1.3 instead of java 1.5!