Unsupported major.minor version 50.0 - JAVA

java.lang.UnsupportedClassVersionError:  (Unsupported major.minor version 50.0)

java.lang.unsupportedclassversionerror unsupported major.minor version 50.0 error comes in Java environment 

when you compile your Java file in a higher Java version e.g. Java 1.6 and then trying to run same Java Code in lower version e.g. Java 1.5. Java is backward compatible 

Every Java release has a major source version as shown below table

Java Version    Major Version

Java 4          48.0

Java 5          49.0

java 6          50.0

java 7          51.0

How TO Solve it ?

to solve it you have to  run the code correct Java version. To adapt it you can try

1) change the JAVA_HOME & path in environment variables ( XP -  win7) and check it.

to check it you can run in console "java -version"

2) IF you are using Eclipse IDE . you can check the compilation version by Windows --> preferences --> java --> compiler  

References:

http://java67.blogspot.com/2012/10/how-to-fix-javalangunsupportedclassversionerror-major-minor-version-49-50-51.html

http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/sysdm_advancd_environmnt_addchange_variable.mspx?mfr=true