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An application seems to run more slowly than it should or more slowly than it did previously, or the application is unresponsive or hangs. You may encounter these situations in production or during development. What is at the root of these problems? Often, the causes -- such as memory leaks, deadlocks, and synchronization issues -- are difficult to diagnose. Version 6 of the Java Platform, Standard Edition (Java SE) provides you with monitoring and management capabilities out of the box to help you diagnose many common Java SE problems.