These experimental troubleshooting tools are useful for very specific troubleshooting. They are experimental and, therefore, not officially supported:

• jinfo: This tool provides configuration information for specific processes, files, or servers
• jhat: This is a heap dump tool. It instantiates a web server so that a heap can be viewed with a browser
• jmap: This displays heap and shared object memory maps from a process, file, or server
• jsadebugd: This is Java's Serviceability Agent Debug Daemon. It acts as a debug server for a process or file
• jstack: This is a Java Stack Trace tool that provides a thread stack trace for a process, file, or server