JDK-6899467 : System property java.class.version out-of-sync with VM for jdk 5.0 with HS 16 in nightly build
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The root cause is that "is_supported_version" implementation in ClassFileParser didn't take into consideration of the possibility that it could work with JDK 5. The logic needs to be enhanced to make the VM to avoid working with class file major version greater than 49.