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Unsupported major.minor version 51.0

 
Ranch Hand
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i'm running a java program i'm getting this exception in myeclipse

java.lang.UnsupportedClassVersionError: Unsupported major.minor version 51.0.

I have changed Jre system libaray to 1.6.0_13 but still not resolved

anyone help me out.
 
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Those classes have been compiled using the Java 7 compiler - they can't be executed by a Java 6 runtime. Delete all class files, recompile with Java 6, and everything should work.
 
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