IBM User Guide for Java V7 on Windows > Troubleshooting and support > Using diagnostic tools > Tracing Java applications and the JVM

Types of tracepoint

There are two types of tracepoints inside the JVM: regular and auxiliary.

Regular tracepoints

Regular tracepoints include:

• method tracepoints
• application tracepoints
• data tracepoints inside the JVM
• data tracepoints inside class libraries

You can display regular tracepoint data on the screen or save the data to a file. You can also use command line options to trigger specific actions when regular tracepoints fire. See the section Detailed descriptions of trace options for more information about command line options.

Auxiliary tracepoints

Auxiliary tracepoints are a special type of tracepoint that can be fired only when another tracepoint is being processed. An example of auxiliary tracepoints are the tracepoints containing the stack frame information produced by the jstacktrace -Xtrace:trigger command. You cannot control where auxiliary tracepoint data is sent and you cannot set triggers on auxiliary tracepoints. Auxiliary tracepoint data is sent to the same destination as the tracepoint that caused them to be generated.

Parent: Tracing Java applications and the JVM

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