Hello,
when i map a composite element with a set the entity gets saved, bu when i switch to an idbag (and switch set to a collection in java) eg:

...
<idbag name="phones"
table="PERSON_PHONE"
order-by="PHONE_NUMBER asc">

<collection-id type="long" column="PERSON_PHONE_ID">
<generator class="identity"/>
</collection-id>

<key column="PERSON_ID"/>

<composite-element class="com.test.domain.Phone">
<parent name="person"/>
<property name="phoneNumber"
column="PHONE_NUMBER"
not-null="true"/>
</composite-element>
</idbag>
...

i end up getting an exception as follows:

java.lang.ClassCastException: org.hibernate.id.IdentifierGeneratorFactory$2 cannot be cast to java.lang.Long
at org.hibernate.type.LongType.set(LongType.java:42)
at org.hibernate.type.NullableType.nullSafeSet(NullableType.java:138)
at org.hibernate.type.NullableType.nullSafeSet(NullableType.java:118)
at org.hibernate.persister.collection.AbstractCollectionPersister.writeIdentifier(AbstractCollectionPersister.java:807)
at org.hibernate.persister.collection.AbstractCollectionPersister.recreate(AbstractCollectionPersister.java:1138)
at org.hibernate.action.CollectionRecreateAction.execute(CollectionRecreateAction.java:26)
at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:250)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:234)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:145)
at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:298)
at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:27)
at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1000)
at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:338)
at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:106)
at com.test.domain.OneToManyTest.testPersonToPhoneAsComponent(OneToManyTest.java:43)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at junit.framework.TestCase.runTest(TestCase.java:168)
at junit.framework.TestCase.runBare(TestCase.java:134)
at junit.framework.TestResult$1.protect(TestResult.java:110)
at junit.framework.TestResult.runProtected(TestResult.java:128)
at junit.framework.TestResult.run(TestResult.java:113)
at junit.framework.TestCase.run(TestCase.java:124)
at junit.framework.TestSuite.runTest(TestSuite.java:232)
at junit.framework.TestSuite.run(TestSuite.java:227)
at org.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:81)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:38)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)

And before that there is a log :

15:31:39,831 DEBUG LongType:135 - binding 'POST_INSERT_INDICATOR' to parameter: 2

15:31:39,831 INFO LongType:142 - could not bind value 'POST_INSERT_INDICATOR' to parameter: 2; org.hibernate.id.IdentifierGeneratorFactory$2 cannot be cast to java.lang.Long

I am using MySql5 and for generator of composite i use identity and native for the entity.
i debugged the save operation all i figured out is that
NullableType.nullSafeSet catches a runtime exception caused by a set() which gets invoked by LongType, apperently Object argument is a IdentifierGeneratorFactory with a value of POST_INSERT_INDICATOR.
Whats going on?