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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0; border-collapse: collapse; padding: 0 0 10px"> <p style="margin: 10px 0 0; margin-top: 0">I was also suspecting a memory leak, because after cleaning the cache the header still shows up in memory dumps with references to query plans. Although, there is a maximum (maximumHotSize), so the "leak" is contained. The header variable could still be cleared, though. </p> <p style="margin: 10px 0 0">My tests with hibernate-test-case-templates, hibernate-orm-4:</p> <p style="margin: 10px 0 0"><b>Event.java</b></p>
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-keyword" style="color: #000091">package</span> org.hibernate.bugs;
<span class="code-keyword" style="color: #000091">import</span> java.util.Date;
<span class="code-keyword" style="color: #000091">import</span> javax.persistence.Entity;
<span class="code-keyword" style="color: #000091">import</span> javax.persistence.GeneratedValue;
<span class="code-keyword" style="color: #000091">import</span> javax.persistence.Id;
<span class="code-keyword" style="color: #000091">import</span> javax.persistence.Temporal;
<span class="code-keyword" style="color: #000091">import</span> javax.persistence.TemporalType;
@Entity
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">class </span>Event {
@Id
@GeneratedValue
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">Long</span> id;
@Temporal(TemporalType.TIMESTAMP )
<span class="code-keyword" style="color: #000091">private</span> Date createdOn;
<span class="code-keyword" style="color: #000091">public</span> Event() {
}
<span class="code-keyword" style="color: #000091">public</span> Event(Date createdOn) {
<span class="code-keyword" style="color: #000091">this</span>.createdOn = createdOn;
}
<span class="code-keyword" style="color: #000091">public</span> <span class="code-object" style="color: #910091">Long</span> getId() {
<span class="code-keyword" style="color: #000091">return</span> id;
}
<span class="code-keyword" style="color: #000091">public</span> Date getCreatedOn() {
<span class="code-keyword" style="color: #000091">return</span> createdOn;
}
}
</pre>
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</div> <p style="margin: 10px 0 0"><b>JPAUnitTestCase.java</b></p>
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<span class="code-keyword" style="color: #000091">package</span> org.hibernate.bugs;
<span class="code-keyword" style="color: #000091">import</span> <span class="code-keyword" style="color: #000091">static</span> org.junit.Assert.assertEquals;
<span class="code-keyword" style="color: #000091">import</span> java.lang.reflect.Field;
<span class="code-keyword" style="color: #000091">import</span> java.util.Date;
<span class="code-keyword" style="color: #000091">import</span> javax.persistence.EntityManager;
<span class="code-keyword" style="color: #000091">import</span> javax.persistence.EntityManagerFactory;
<span class="code-keyword" style="color: #000091">import</span> javax.persistence.Persistence;
<span class="code-keyword" style="color: #000091">import</span> org.hibernate.Session;
<span class="code-keyword" style="color: #000091">import</span> org.hibernate.SessionFactory;
<span class="code-keyword" style="color: #000091">import</span> org.hibernate.engine.query.spi.QueryPlanCache;
<span class="code-keyword" style="color: #000091">import</span> org.hibernate.internal.SessionFactoryImpl;
<span class="code-keyword" style="color: #000091">import</span> org.hibernate.internal.util.collections.BoundedConcurrentHashMap;
<span class="code-keyword" style="color: #000091">import</span> org.junit.After;
<span class="code-keyword" style="color: #000091">import</span> org.junit.Before;
<span class="code-keyword" style="color: #000091">import</span> org.junit.Test;
/**
* This template demonstrates how to develop a test <span class="code-keyword" style="color: #000091">case</span> <span class="code-keyword" style="color: #000091">for</span> Hibernate ORM, using the Java Persistence API.
*/
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">class </span>JPAUnitTestCase {
        <span class="code-keyword" style="color: #000091">private</span> EntityManagerFactory entityManagerFactory;
        @Before
        <span class="code-keyword" style="color: #000091">public</span> void init() {
                entityManagerFactory = Persistence.createEntityManagerFactory( <span class="code-quote" style="color: #009100">"templatePU"</span> );
        }
        @After
        <span class="code-keyword" style="color: #000091">public</span> void destroy() {
                entityManagerFactory.close();
        }
        <span class="code-comment" style="color: #808080">// Entities are auto-discovered, so just add them anywhere on <span class="code-keyword" style="color: #000091; color: #808080">class-</span>path
</span>        <span class="code-comment" style="color: #808080">// Add your tests, using standard JUnit.
</span>        @Test
        <span class="code-keyword" style="color: #000091">public</span> void hhh123Test() <span class="code-keyword" style="color: #000091">throws</span> Exception {
                EntityManager entityManager = entityManagerFactory.createEntityManager();
                entityManager.getTransaction().begin();
                
                Session session = entityManager.unwrap(Session.class);
                SessionFactory sessionFactory = session.getSessionFactory();
                SessionFactoryImpl factoryImpl = (SessionFactoryImpl) sessionFactory;
                QueryPlanCache cache = factoryImpl.getQueryPlanCache();
                Field f = cache.getClass().getDeclaredField(<span class="code-quote" style="color: #009100">"queryPlanCache"</span>);
                f.setAccessible(<span class="code-keyword" style="color: #000091">true</span>);
                BoundedConcurrentHashMap queryPlanCache = (BoundedConcurrentHashMap) f.get(cache);
                assertEquals(0, queryPlanCache.size());
                
        
                Event event = <span class="code-keyword" style="color: #000091">new</span> Event( <span class="code-keyword" style="color: #000091">new</span> Date() );
                entityManager.persist( event );
        
                <span class="code-object" style="color: #910091">System</span>.out.println(<span class="code-object" style="color: #910091">Runtime</span>.getRuntime().totalMemory());
                
         <span class="code-keyword" style="color: #000091">for</span> (<span class="code-object" style="color: #910091">int</span> i = 0; i < 10000; i++) {
                 assertEquals(0, queryPlanCache.size());
                 Event dbEvent = entityManager.createQuery(<span class="code-quote" style="color: #009100">"select e from Event e"</span>, Event.class).getSingleResult();
                
                 assertEquals(event.getCreatedOn(), dbEvent.getCreatedOn());
                 assertEquals(1, queryPlanCache.size());
                
                 queryPlanCache.clear();
                
                 assertEquals(0, queryPlanCache.size());
                        
                 <span class="code-keyword" style="color: #000091">if</span>(i%100 == 0) {
                         <span class="code-object" style="color: #910091">System</span>.gc();
                         <span class="code-object" style="color: #910091">System</span>.out.println(<span class="code-object" style="color: #910091">String</span>.format(<span class="code-quote" style="color: #009100">"i: %d, percentage mem: %f"</span>, i, (<span class="code-object" style="color: #910091">Runtime</span>.getRuntime().totalMemory() - <span class="code-object" style="color: #910091">Runtime</span>.getRuntime().freeMemory()) * 100.0/<span class="code-object" style="color: #910091">Runtime</span>.getRuntime().totalMemory() ));
                 }
                }
        
                entityManager.getTransaction().commit();
                entityManager.close();
        }
}
</pre>
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