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<p style="margin: 10px 0 0 0">I ran into something very similar. In my case I have parent/children unidirectional one-to-many relation. </p>
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<pre class="code-java" style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
class Parent
{
<span class="code-keyword" style="color: #000091">private</span> ArrayList children;
@OneToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL)
@JoinColumn(name=<span class="code-quote" style="color: #009100">"parent_id"</span>, nullable = <span class="code-keyword" style="color: #000091">false</span>)
@OrderBy(value = <span class="code-quote" style="color: #009100">"time"</span>)
<span class="code-keyword" style="color: #000091">public</span> List<Child> getChildred()
{
children.trimToSize();
<span class="code-keyword" style="color: #000091">return</span> Collections.synchronizedList(children);
}
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<p style="margin: 10px 0 0 0">The test case that's failing is fairly standard:</p>
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<pre class="code-java" style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
Parent myParent = <span class="code-keyword" style="color: #000091">new</span> Parent();
<span class="code-comment" style="color: #808080">//some fields are set
</span>
Child child1 = <span class="code-keyword" style="color: #000091">new</span> Child();
Child child2 = <span class="code-keyword" style="color: #000091">new</span> Child();
<span class="code-comment" style="color: #808080">//set child1 & child2 values through setters
</span>
ArrayList<Child> children = <span class="code-keyword" style="color: #000091">new</span> ArrayList<Child>();
children.add(child1);
children.add(child2);
myParent.setChildren(children);
<span class="code-comment" style="color: #808080">//Then essentially:
</span>
EntityManager em = emf.createEntityManager();
em.getTransaction().begin();
em.merge(myParent);
em.flush();
em.getTransaction().commit();
em.close();
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<p style="margin: 10px 0 0 0">The stack trace is as follows:</p>
<p style="margin: 10px 0 0 0">java.util.ConcurrentModificationException<br /> at java.util.ArrayList$Itr.checkForComodification(Unknown Source)<br /> at java.util.ArrayList$Itr.next(Unknown Source)<br /> at org.hibernate.engine.internal.Cascade.cascadeCollectionElements(Cascade.java:418)<br /> at org.hibernate.engine.internal.Cascade.cascadeCollection(Cascade.java:344)<br /> at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:307)<br /> at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:146)<br /> at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:95)<br /> at org.hibernate.event.internal.AbstractSaveEventListener.cascadeAfterSave(AbstractSaveEventListener.java:456)<br /> at org.hibernate.event.internal.DefaultMergeEventListener.entityIsTransient(DefaultMergeEventListener.java:239)<br /> at org.hibernate.event.internal.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:173)<br /> at org.hibernate.event.internal.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:69)<br /> at org.hibernate.internal.SessionImpl.fireMerge(SessionImpl.java:839)<br /> at org.hibernate.internal.SessionImpl.merge(SessionImpl.java:821)<br /> at org.hibernate.internal.SessionImpl.merge(SessionImpl.java:826)<br /> at org.hibernate.jpa.spi.AbstractEntityManagerImpl.merge(AbstractEntityManagerImpl.java:1161)<br /> --------------------------------- //here goes the code I posted above<br /> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)<br /> at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)<br /> at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)<br /> at java.lang.reflect.Method.invoke(Unknown Source)<br /> at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)<br /> at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)<br /> at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)<br /> at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)<br /> at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)<br /> at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)<br /> at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)<br /> at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)<br /> at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)<br /> at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)<br /> at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)<br /> at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)<br /> at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)<br /> at org.junit.runners.ParentRunner.run(ParentRunner.java:309)<br /> at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)<br /> at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)<br /> at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)<br /> at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)<br /> at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)<br /> at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)</p>
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<pre style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal; white-space: pre; word-break: normal; word-wrap: break-word; word-break: break-word; white-space: pre-wrap">*no* further _formatting_ is done here
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