Help with error

[afflictedd2]

Hi everyone,

I'm getting this error, and I'm not sure how to fix it. I've deleted and built the file again, but I keep getting the same error.

Exception in thread "main" java.lang.UnsupportedClassVersionError: Bad version number in .class file
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java :676)
at java.security.SecureClassLoader.defineClass(Secure ClassLoader.java:124)
at java.net.URLClassLoader.defineClass(URLClassLoader .java:260)
at java.net.URLClassLoader.access$100(URLClassLoader. java:56)
at java.net.URLClassLoader$1.run(URLClassLoader.java: 195)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.j ava:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:3 17)
at sun.misc.Launcher$AppClassLoader.loadClass(Launche r.java:280)
at java.lang.ClassLoader.loadClass(ClassLoader.java:2 52)
at java.lang.ClassLoader.loadClassInternal(ClassLoade r.java:375)

Any help appreciated,
Ted

[JosAH]

Check the version of your compiler (javac -version) against the version of your jvm (java -version); they should match; also search for that class file, maybe an (old) copy is still stored somewere.

kind regards,

Jos

[afflictedd2]

Hmm they match, I'm using eclipse, and things are a little messed up there because it has this Java version 1.6 that is unbound*

// java version "1.5.0_22"
// Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_22-b03-333-9M3125)
// Java HotSpot(TM) Client VM (build 1.5.0_22-147, mixed mode, sharing)

// javac 1.5.0_22
// javac: no source files

Is there a way to determine what version the class file has been compiled with.

Ted

[JosAH]

Is there a way to determine what version the class file has been compiled with.

If you compiled your class with Eclipse, go to Project>Properties>Java Compiler; in the right panel you can see the compliance level of the compiler. Set it to 1.5 (the version of your jvm).

kind regards,

Jos

[afflictedd2]

aghh I tried that, it still doesn't work :(. The file has a lot of dependencies (other classes referenced) as well, so i'm also wondering if the problem is there, as they might be compiled on a different version, and eclipse doesn't seem to have a clean rebuild option.

[JosAH]

aghh I tried that, it still doesn't work :(. The file has a lot of dependencies (other classes referenced) as well, so i'm also wondering if the problem is there, as they might be compiled on a different version, and eclipse doesn't seem to have a clean rebuild option.

Eclipse has several options for that: you can start it from the shell (command line) with the -clean option, i.e. type "eclipse -clean"; alternatively you can go to Project>Clean ... and select the clean all projects option.

The last alternative is to select all projects in the package pane and press F5. Don't forget to set the compiler compliance to 1.5 for all your projects.

kind regards,

Jos