Java - Error Encountered - java.lang.UnsupportedClassVersionError

JDK: External version 6, Internal version 1.6.0 update 25

Error occurred while executing class file

Command:
javac ShirtTest


Exception in thread "main" java.lang.UnsupportedClassVersionError: Shirt (Unsupported major.minor version 50.0)
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)

Resolution:

1. Environment variables not properly set, so set system environment variable ‘Path’ to include path “C:\Program Files\Java\jdk1.6.0_25\jre\bin\java” or
2. Run using below command:
   "C:\Program Files\Java\jdk1.6.0_25\jre\bin\java" ShirtTest