EclipseLink/UserGuide/JPA/Advanced JPA Development/Performance/Performance Monitoring and Profiling/Fetch Group Monitoring
For current information, please see "Fetch Group Monitoring" in the EclipseLink Concepts Guide: http://www.eclipse.org/eclipselink/documentation/latest/concepts/monitoring002.htm
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Fetch Group Monitoring
Use the Fetch Group Monitor to measure fetch group field usage. This can be useful for performance analysis in a complex system.
Enable this monitor using the System property org.eclipse.persistence.fetchgroupmonitor=true.
The monitor dumps the attribute used for a class every time a new attribute is accessed.
For more information about fetch groups, see Fetch Groups.