Documentation for EclipseLink is quite lacking.
While for Hibernate it is quite easy to find out how to log SQL statements, I had some trouble to find out how to accomplish this in EclipseLink.
The solution are the following properties in persistence.xml:
<property name="eclipselink.logging.level.sql" value="FINE"/>
<property name="eclipselink.logging.parameters" value="true"/>
This solution I finally found here.
An alternative is also to use log4jdbc or log4jdbc-remix (the latter is available in the sonatype maven repository). An example is available in exercise 10 of my jpaworkshop.
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