General debugging techniques

A short guide to the diagnostic tools provided by the JVM and the z/OS® commands that can be useful when diagnosing problems with the z/OS JVM.

In addition to the information given in this section, you can obtain z/OS publications from the IBM® website. Go to https://www.ibm.com/support/publications/us/library/, and then choose the documentation link for your platform.

There are several diagnostic tools available with the JVM to help diagnose problems:

Starting Javadumps, see Using Javadumps in the J9 VM reference.
Starting Heapdumps, see Using Heapdumps in the J9 VM reference.
Starting system dumps, see Dump viewer in the OpenJ9 user documentation.

z/OS provides various commands and tools that can be useful in diagnosing problems.