IBM User Guide for Java V7 on Windows > Troubleshooting and support > Using diagnostic tools > Using the JVMTI > IBM JVMTI extensions - API reference

Setting JVM trace options

You can set trace options for the JVM using the same syntax as the -Xtrace command-line option.

The SetVmTrace() API has the JVMTI Extension Function identifier com.ibm.SetVmTrace. The identifier is declared as macro COM_IBM_SET_VM_TRACE in ibmjvmti.h.

To set a JVM trace option, use:

jvmtiError SetVmTrace(jvmtiEnv* jvmti_env, char* option)

The trace option is passed in as an ASCII character string. Use the same syntax as the -Xtrace command-line option, with the initial -Xtrace: omitted. See Detailed descriptions of trace options.

Parameters:

jvmti_env: JVMTI environment pointer.

option: Enter the JVM trace option string.

Returns:

JVMTI_ERROR_NONE: Success.

JVMTI_ERROR_NULL_POINTER: The option parameter is null.

JVMTI_ERROR_OUT_OF_MEMORY: There is insufficient system memory to process the request.

JVMTI_ERROR_INVALID_ENVIRONMENT: The jvmti_env parameter is invalid.

JVMTI_ERROR_WRONG_PHASE: The extension has been called outside the JVMTI live phase.

JVMTI_ERROR_ILLEGAL_ARGUMENT: The option parameter contains an invalid -Xtrace string.

Parent: IBM JVMTI extensions - API reference

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