[~dometec], I was able to reproduce this and will take a closer look when I have a chance. Notes for myself:
CollectionBinder#bind had a relevant fix commented out -- switched it to the following:
{code}
// do it right away, otherwise @ManyToOne on composite element call addSecondPass
// and raise a ConcurrentModificationException
sp.doSecondPass( CollectionHelper.EMPTY_MAP );
// mappings.addSecondPass( sp, !isMappedBy );
{code}
Your entities had the following, causing the issue:
{code}
User
@ElementCollection(fetch = FetchType.EAGER)
private Set<Address> addresses;
Address
@ElementCollection(fetch = FetchType.EAGER)
@Enumerated(EnumType.STRING)
private Set<AddressType> type;
{code}
Un-commenting that fix results in an exception at the following stack. Something goofy is going on with the CompositeElementPropertyMapping sequence -- Address#type is being interpreted as "One to One", according to the exception.
{code}
Thread [main] (Suspended (breakpoint at line 61 in AbstractPropertyMapping))
CompositeElementPropertyMapping(AbstractPropertyMapping).getIdentifierColumnNames() line: 61
CompositeElementPropertyMapping(AbstractPropertyMapping).initPropertyPaths(String, Type, String[], String[], String[], String[], Mapping) line: 187
CompositeElementPropertyMapping(AbstractPropertyMapping).initComponentPropertyPaths(String, CompositeType, String[], String[], String[], String[], Mapping) line: 285
CompositeElementPropertyMapping.<init>(String[], String[], String[], String[], CompositeType, Mapping) line: 49
BasicCollectionPersister(AbstractCollectionPersister).<init>(Collection, CollectionRegionAccessStrategy, Configuration, SessionFactoryImplementor) line: 551
BasicCollectionPersister.<init>(Collection, CollectionRegionAccessStrategy, Configuration, SessionFactoryImplementor) line: 76
NativeConstructorAccessorImpl.newInstance0(Constructor, Object[]) line: not available [native method]
NativeConstructorAccessorImpl.newInstance(Object[]) line: 57
DelegatingConstructorAccessorImpl.newInstance(Object[]) line: 45
Constructor<T>.newInstance(Object...) line: 525
PersisterFactoryImpl.create(Class<CollectionPersister>, Class[], Object, Object, CollectionRegionAccessStrategy, SessionFactoryImplementor) line: 231
PersisterFactoryImpl.createCollectionPersister(Configuration, Collection, CollectionRegionAccessStrategy, SessionFactoryImplementor) line: 201
SessionFactoryImpl.<init>(Configuration, Mapping, ServiceRegistry, Settings, SessionFactoryObserver) line: 421
Configuration.buildSessionFactory(ServiceRegistry) line: 1849
TestCase(BaseCoreFunctionalTestCase).buildSessionFactory() line: 147
NativeMethodAccessorImpl.invoke0(Method, Object, Object[]) line: not available [native method]
NativeMethodAccessorImpl.invoke(Object, Object[]) line: 57
DelegatingMethodAccessorImpl.invoke(Object, Object[]) line: 43
Method.invoke(Object, Object...) line: 601
TestClassMetadata.performCallbackInvocation(Method, Object) line: 209
TestClassMetadata.invokeCallback(Method, Object) line: 196
TestClassMetadata.performCallbacks(LinkedHashSet<Method>, Object) line: 190
TestClassMetadata.performBeforeClassCallbacks(Object) line: 181
BeforeClassCallbackHandler.evaluate() line: 42
AfterClassCallbackHandler.evaluate() line: 42
CustomRunner(ParentRunner<T>).run(RunNotifier) line: 300
JUnit4TestMethodReference(JUnit4TestReference).run(TestExecution) line: 50
TestExecution.run(ITestReference[]) line: 38
RemoteTestRunner.runTests(String[], String, TestExecution) line: 467
RemoteTestRunner.runTests(TestExecution) line: 683
RemoteTestRunner.run() line: 390
RemoteTestRunner.main(String[]) line: 197
{code}
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