Windows Vista

Check a Java jar to make sure all the javac -target versions of the class files are what you expect. It makes sure that a jar intended to run under an old 1.1 JVM contains no classes accidentally compiled with javac -target 1.5. This should catch classes normally compiled with target 1.1 that were accidentally compiled with 1.5 as a side effect of compiling some 1.5 class.

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