IBM User Guide for Java V7 on Windows > Troubleshooting and support > Using diagnostic tools > Using the Reliability, Availability, and Serviceability Interface

Preparing to use JVMRI

Trace and dump functions in the JVMRI require the JVM trace and dump libraries to be loaded. These libraries will be loaded by default, but JVMRI will fail with a warning message if you specify -Xtrace:none or -Xdump:none.

See Command-line options for more information.

• Writing an agent
  This piece of code demonstrates how to write a very simple JVMRI agent.
• Registering a trace listener
  Before you start using the trace listener, you must set the -Xtrace option with the relevant external=tp_spec information. This action tells the object which tracepoints to listen for.
• Changing trace options
  This example uses the TraceSet() function to change the JVM trace setting. It makes the assumption that the options string that is specified with the -Xrun option and passed to JVM_Onload() is a trace setting.
• Starting the agent
  To start the agent when the JVM starts up, use the -Xrun option. For example if your agent is called jvmri, specify -Xrunjvmri: <options> on the command-line.
• Building the agent
  You must set some configuration options before you can build a JVMRI agent.
• Agent design
  The agent must reference the header files jni.h and jvmri.h, which are shipped with the SDK and are in the sdk\include subdirectory.

Parent: Using the Reliability, Availability, and Serviceability Interface

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