Exception in thread main Java lang unsupportedclassversionerror a unsupporte

Question

Below is the exception I get in my JDK7 when I try to compile a simple ‘hello world’ program:

 

Exception in thread "main" java.lang.UnsupportedClassVersionError: a (Unsupported major.minor version 51.0)

    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)

The Java version I have is 1.4.2_03. Can anyone tell me what I’m doing wrong here?

Answer 1

Change the PATH settings to a newer version of Java which is 7 and remove the 1.4.2 Path. After you save it, relaunch your command prompt to check the Java version --java version. 

After saving and applying "Environment Variables'' close and reopen the cmd line. In XP the path does not get reflected in already running programs.

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