JPA monitor for persistence context

How convinion deb开发者_如何转开发ug state of persistence context, watch result of queries, monitor all entities?

Is some JPA monitor for this?

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If you are using EclipseLink, there is a performance monitor option,

see,

http://wiki.eclipse.org/EclipseLink/UserGuide/JPA/Advanced_JPA_Development/Performance/Performance_Monitoring_and_Profiling/Performance_Monitoring

You can also configure logging,

http://wiki.eclipse.org/EclipseLink/Examples/JPA/Logging