How to activate Hibernate Statistics to analyze performance issues (http://www.thoughts-on-java.org/2015/03/how-to-activate-hibernate-statistics-to.html)

loop.java

for (int i=0; i<10; i++) {
   Product p = new Product();
   p.setName("MyProduct"+i);
   this.em.persist(p);
}

this.em.createQuery("Select p From Product p").getResultList();

Product.java

@Entity
public class Product implements Serializable
{
   @Id
   @GeneratedValue(strategy = GenerationType.AUTO)
   @Column(name = "id", updatable = false, nullable = false)
   private Long id = null;
   
   @Version
   @Column(name = "version")
   private int version = 0;
   
   @Column
   private String name;

   ...
}

server.log

2015-03-03 20:28:52,484 DEBUG [org.hibernate.stat.internal.ConcurrentStatisticsImpl] (default task-1) HHH000117: HQL: Select p From Product p, time: 0ms, rows: 10
2015-03-03 20:28:52,484 INFO  [org.hibernate.engine.internal.StatisticalLoggingSessionEventListener] (default task-1) Session Metrics {
    8728028 nanoseconds spent acquiring 12 JDBC connections;
    295527 nanoseconds spent releasing 12 JDBC connections;
    12014439 nanoseconds spent preparing 21 JDBC statements;
    5622686 nanoseconds spent executing 21 JDBC statements;
    0 nanoseconds spent executing 0 JDBC batches;
    0 nanoseconds spent performing 0 L2C puts;
    0 nanoseconds spent performing 0 L2C hits;
    0 nanoseconds spent performing 0 L2C misses;
    403863 nanoseconds spent executing 1 flushes (flushing a total of 10 entities and 0 collections);
    25529864 nanoseconds spent executing 1 partial-flushes (flushing a total of 10 entities and 10 collections)
}

standalone.xml

<system-properties>
   <property name="hibernate.generate_statistics" value="true"/>
</system-properties>

...

<profile>
   <subsystem xmlns="urn:jboss:domain:logging:2.0">
   
      ...
      <logger category="org.hibernate.stat">
         <level name="DEBUG"/>
      </logger>

...