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-XX:+PrintConcurrentLocks: This will cause the Ctrl-Break handler to print a list of concurrent locks owned by each thread
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-XX:+PrintClassHistogram: This will cause the Ctrl-Break handler to print a heap histogram.
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-XX:+TraceClassLoading: This is used to trace loading of classes.
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-XX:+TraceClassUnloading: This is used to trace unloading of classes.