Description of problem:
Cannot delete users with OracleDB because of "ORA-02292: integrity constraint (XXXXX) violated - child record found"[1]. The child record is in the JBID_IO_ATTR table[2].

[1]
2013-12-05 15:40:25,846 DEBUG [org.hibernate.util.JDBCExceptionReporter] (http-127.0.0.1-8080-1) Could not execute JDBC batch update [delete from jbid_io where ID=?]
java.sql.BatchUpdateException: ORA-02292: integrity constraint (ORAUSER.FK4DC61D7E992317F0) violated - child record found

    at oracle.jdbc.driver.OraclePreparedStatement.executeBatch(OraclePreparedStatement.java:10345)
    at oracle.jdbc.driver.OracleStatementWrapper.executeBatch(OracleStatementWrapper.java:230)
    at org.jboss.resource.adapter.jdbc.CachedPreparedStatement.executeBatch(CachedPreparedStatement.java:476)
    at org.jboss.resource.adapter.jdbc.WrappedStatement.executeBatch(WrappedStatement.java:774)
    at org.hibernate.jdbc.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:70)
    at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:268)
    at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:265)
    at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:171)
    at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321)
    at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:50)
    at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1030)
    at sun.reflect.GeneratedMethodAccessor346.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.hibernate.context.ThreadLocalSessionContext$TransactionProtectionWrapper.invoke(ThreadLocalSessionContext.java:343)
    at com.sun.proxy.$Proxy266.flush(Unknown Source)
    at org.picketlink.idm.impl.store.hibernate.HibernateIdentityStoreImpl.removeIdentityObject(HibernateIdentityStoreImpl.java:622)
    at org.picketlink.idm.impl.repository.WrapperIdentityStoreRepository.removeIdentityObject(WrapperIdentityStoreRepository.java:158)
    at org.picketlink.idm.impl.api.session.managers.PersistenceManagerImpl.removeUser(PersistenceManagerImpl.java:231)
    at org.exoplatform.services.organization.idm.UserDAOImpl.removeUser(UserDAOImpl.java:268)

[2]
JBID_IO_ATTR:

ATTRIBUTE_ID	423
IDENTITY_OBJECT_ID	413
NAME	user.language
ATTRIBUTE_TYPE	text
BIN_VALUE_ID	NULL


How reproducible: 100 %

Steps to Reproduce:
1. Change gatein-idm and gatein-jcr to use OracleDB.
2. Start EPP
3. Login as root
4. Create a user
5. Delete the user

Actual results:

Cannot delete the user. 

Expected results:
The user is deleted.

Additional info:
Some user attributes are deleted, so this process is not transactional.