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JHades In a Nutshell - JHades is a tool that helps troubleshooting classpath problems. The main features are:

-Duplicate classes detection: a command line tool list duplicate classes in a WAR, and allows filtering 'harmless' duplicates -Runtime classpath debugging: a utility class exists to query the classpath at runtime for details on the class loader chain, jars, hidden class files, etc. -Server startup troubleshooting: jHades works works well in scenarios where the server does not even start