JVM Troubleshooting Tools in JDK

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∟JVM Troubleshooting Tools in JDK

This section provides quick descriptions on JVM troubleshooting tools included in JDK.

Over the years, a number of Java troubleshooting tools has been introduced in JDK:

"jinfo": Prints configuration information for a given JVM process or a Java core file on the local machine or on a remote machine through a debug server.

"jhat" (discontinued since JDK 9) - Heap Dump Browser: Starts a Web server on a Java heap dump file (eg, produced by "jmap -dump"), allowing the heap to be browsed.

"jmap" - Memory Map: Prints shared object memory maps or heap memory details of a given JVM process or a Java core file on the local machine or on a remote machine through a debug server.

"jsadebugd" (replaced by "jhsdb debugd" since JDK 9) - Serviceability Agent Debug Daemon: Attaches to a JVM process or a Java core file and acts as a debug server for remote tools to connect.

"jstack" - Stack Trace: Prints a stack trace of threads for a given JVM process or a Java core file on the local machine or on a remote machine through a debug server.

"jhsdb" - Java HotSpot Debugger: Attaches to a JVM process for debugging. Or launches a postmortem debugger to analyze the content of a core dump from a crashed JVM.

All tools listed above are included in JDK installation. You can run them by typing in their names at the command prompt, if you have %java_home%\bin directory included in "path" the environment variable.