java .class problems

[alien100]

i have this error message when i type in cmd java (name of program)](*,)

error

Code: Select all

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(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Sour
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Metho
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Sourc
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)

its annoying

how do i fix it ??

[bad_brain]

hm, this happens when the applet you want to run was compiled on a newer Java version than the one you have installed. I don't mean the SDK (service development kit), I mean the runtime environment (JRE). upgrade to the newest version and it should work fine:
http://www.java.com/en/download/index.jsp
best uninstall the old JRE first (not the SDK).

[alien100]

I fixed it
the problem was i had two different versions of JAVA runtime one build into the JDK and a different one in different direcotries so i had to remove the other one and stick with the one that is build into the JDK