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1. I'm having much trouble figuring a MySQL error log    stackoverflow.com

I made a web-app using JSF, MySQL, and NetBeans(web-app template-design). Here's the error-trace I get: http://adelazzam.com/errorTrace.htm 

javax.persistence.PersistenceException: Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.0.1.v20100213-r6600): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: java.sql.SQLException: Error in allocating a ...

2. JPA and logging entity changes    java.net