Printing Hibernate generated SQL statements

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In logging file (log4j2.xml) enable hibernate loggers: 
 
 <Logger name="log4j.logger.org.hibernate.SQL" level="debug" />
 <Logger name="log4j.logger.org.hibernate.type.descriptor.sql" level="trace" />
In persistence.xml turn on printing and formatting SQL statments: 
 <property name="hibernate.show_sql" value="true" />
 <property name="hibernate.use_sql_comments" value="true" />
 <property name="hibernate.format_sql" value="true" />

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