EclipseLinkのログをSlf4Jにブリッジする ref: http://qiita.com/hisamekms/items/2ef7c224534591810ed6

JpaSessionCustomizer.java

package misc.jpa;

import org.eclipse.persistence.config.SessionCustomizer;
import org.eclipse.persistence.sessions.Session;

public class JpaSessionCustomizer implements SessionCustomizer {

    @Override
    public void customize(Session sn) throws Exception {
        sn.setSessionLog(new Slf4jSessionLogger());
    }

}

persistence.xml

<properties>
  <property name="eclipselink.session.customizer" value="misc.jpa.JpaSessionCustomizer"/>
</properties>