Here is Hibernate Trace, it seems like Hibernate thinks that the Entity is Transient in these lines, but i can't understand why. [org.hibernate.event.def.AbstractSaveEventListener] transient instance of: test.Flight 2009-06-01 14:11:08,466 TRACE [org.hibernate.event.def.DefaultPersistEventListener] saving transient instance anonymous wrote : | 2009-06-01 14:11:08,404 DEBUG [org.hibernate.impl.SessionFactoryImpl] obtaining JTA TransactionManager | 2009-06-01 14:11:08,404 INFO [org.hibernate.util.NamingHelper] JNDI InitialContext properties:{} | 2009-06-01 14:11:08,404 DEBUG [org.hibernate.impl.SessionFactoryImpl] Checking 0 named HQL queries | 2009-06-01 14:11:08,404 DEBUG [org.hibernate.impl.SessionFactoryImpl] Checking 0 named SQL queries | 2009-06-01 14:11:08,419 INFO [org.hibernate.util.NamingHelper] JNDI InitialContext properties:{} | 2009-06-01 14:11:08,419 INFO [org.hibernate.transaction.TransactionManagerLookupFactory] instantiating TransactionManagerLookup: org.hibernate.transaction.JBossTransactionManagerLookup | 2009-06-01 14:11:08,419 INFO [org.hibernate.transaction.TransactionManagerLookupFactory] instantiated TransactionManagerLookup | 2009-06-01 14:11:08,419 INFO [org.hibernate.util.NamingHelper] JNDI InitialContext properties:{} | 2009-06-01 14:11:08,451 DEBUG [org.hibernate.jdbc.JDBCContext] successfully registered Synchronization | 2009-06-01 14:11:08,451 DEBUG [org.hibernate.impl.SessionImpl] opened session at timestamp: 12438546684 | 2009-06-01 14:11:08,466 TRACE [org.hibernate.event.def.AbstractSaveEventListener] transient instance of: test.Flight | 2009-06-01 14:11:08,466 TRACE [org.hibernate.event.def.DefaultPersistEventListener] saving transient instance | 2009-06-01 14:11:08,466 DEBUG [org.hibernate.jdbc.AbstractBatcher] about to open PreparedStatement (open PreparedStatements: 0, globally: 0) | 2009-06-01 14:11:08,466 DEBUG [org.hibernate.jdbc.ConnectionManager] opening JDBC connection | 2009-06-01 14:11:08,466 TRACE [org.hibernate.connection.DriverManagerConnectionProvider] total checked-out connections: 0 | 2009-06-01 14:11:08,466 TRACE [org.hibernate.connection.DriverManagerConnectionProvider] using pooled JDBC connection, pool size: 0 | 2009-06-01 14:11:08,466 DEBUG [org.hibernate.SQL] select hibernate_sequence.nextval from dual | 2009-06-01 14:11:08,466 INFO [STDOUT] Hibernate: select hibernate_sequence.nextval from dual | 2009-06-01 14:11:08,466 TRACE [org.hibernate.jdbc.AbstractBatcher] preparing statement | 2009-06-01 14:11:08,748 DEBUG [org.hibernate.id.SequenceGenerator] Sequence identifier generated: 1 | 2009-06-01 14:11:08,748 DEBUG [org.hibernate.jdbc.AbstractBatcher] about to close PreparedStatement (open PreparedStatements: 1, globally: 1) | 2009-06-01 14:11:08,748 TRACE [org.hibernate.jdbc.AbstractBatcher] closing statement | 2009-06-01 14:11:08,748 DEBUG [org.hibernate.jdbc.ConnectionManager] aggressively releasing JDBC connection | 2009-06-01 14:11:08,748 DEBUG [org.hibernate.jdbc.ConnectionManager] releasing JDBC connection [ (open PreparedStatements: 0, globally: 0) (open ResultSets: 0, globally: 0)] | 2009-06-01 14:11:08,748 TRACE [org.hibernate.connection.DriverManagerConnectionProvider] returning connection to pool, pool size: 1 | 2009-06-01 14:11:08,748 DEBUG [org.hibernate.id.SequenceHiLoGenerator] new hi value: 1 | 2009-06-01 14:11:08,748 DEBUG [org.hibernate.event.def.AbstractSaveEventListener] generated identifier: 10, using strategy: org.hibernate.id.SequenceHiLoGenerator | 2009-06-01 14:11:08,748 TRACE [org.hibernate.event.def.AbstractSaveEventListener] saving [test.Flight#10] | 2009-06-01 14:11:08,763 TRACE [org.hibernate.event.def.AbstractFlushingEventListener] flushing session | 2009-06-01 14:11:08,763 DEBUG [org.hibernate.event.def.AbstractFlushingEventListener] processing flush-time cascades | 2009-06-01 14:11:08,763 DEBUG [org.hibernate.event.def.AbstractFlushingEventListener] dirty checking collections | 2009-06-01 14:11:08,763 TRACE [org.hibernate.event.def.AbstractFlushingEventListener] Flushing entities and processing referenced collections | 2009-06-01 14:11:08,763 TRACE [org.hibernate.event.def.AbstractFlushingEventListener] Processing unreferenced collections | 2009-06-01 14:11:08,763 TRACE [org.hibernate.event.def.AbstractFlushingEventListener] Scheduling collection removes/(re)creates/updates | 2009-06-01 14:11:08,763 DEBUG [org.hibernate.event.def.AbstractFlushingEventListener] Flushed: 1 insertions, 0 updates, 0 deletions to 1 objects | 2009-06-01 14:11:08,763 DEBUG [org.hibernate.event.def.AbstractFlushingEventListener] Flushed: 0 (re)creations, 0 updates, 0 removals to 0 collections | 2009-06-01 14:11:08,763 DEBUG [org.hibernate.pretty.Printer] listing entities: | 2009-06-01 14:11:08,763 DEBUG [org.hibernate.pretty.Printer] test.Flight{id=10, name=flightName} | 2009-06-01 14:11:08,763 TRACE [org.hibernate.event.def.AbstractFlushingEventListener] executing flush | 2009-06-01 14:11:08,763 TRACE [org.hibernate.jdbc.ConnectionManager] registering flush begin | 2009-06-01 14:11:08,763 TRACE [org.hibernate.persister.entity.AbstractEntityPersister] Inserting entity: [test.Flight#10] | 2009-06-01 14:11:08,763 DEBUG [org.hibernate.jdbc.AbstractBatcher] about to open PreparedStatement (open PreparedStatements: 0, globally: 0) | 2009-06-01 14:11:08,763 DEBUG [org.hibernate.jdbc.ConnectionManager] opening JDBC connection | 2009-06-01 14:11:08,763 TRACE [org.hibernate.connection.DriverManagerConnectionProvider] total checked-out connections: 0 | 2009-06-01 14:11:08,763 TRACE [org.hibernate.connection.DriverManagerConnectionProvider] using pooled JDBC connection, pool size: 0 | 2009-06-01 14:11:08,763 DEBUG [org.hibernate.SQL] insert into tbl_flight (name, id) values (?, ?) | 2009-06-01 14:11:08,763 INFO [STDOUT] Hibernate: insert into tbl_flight (name, id) values (?, ?) | 2009-06-01 14:11:08,763 TRACE [org.hibernate.jdbc.AbstractBatcher] preparing statement | 2009-06-01 14:11:08,763 TRACE [org.hibernate.persister.entity.AbstractEntityPersister] Dehydrating entity: [test.Flight#10] | 2009-06-01 14:11:08,779 TRACE [org.hibernate.type.StringType] binding 'flightName' to parameter: 1 | 2009-06-01 14:11:08,779 TRACE [org.hibernate.type.LongType] binding '10' to parameter: 2 | 2009-06-01 14:11:08,779 DEBUG [org.hibernate.jdbc.AbstractBatcher] Executing batch size: 1 | 2009-06-01 14:11:08,779 DEBUG [org.hibernate.jdbc.Expectations] success of batch update unknown: 0 | 2009-06-01 14:11:08,779 DEBUG [org.hibernate.jdbc.AbstractBatcher] about to close PreparedStatement (open PreparedStatements: 1, globally: 1) | 2009-06-01 14:11:08,779 TRACE [org.hibernate.jdbc.AbstractBatcher] closing statement | 2009-06-01 14:11:08,779 DEBUG [org.hibernate.jdbc.ConnectionManager] skipping aggressive-release due to flush cycle | 2009-06-01 14:11:08,779 TRACE [org.hibernate.jdbc.ConnectionManager] registering flush end | 2009-06-01 14:11:08,779 DEBUG [org.hibernate.jdbc.ConnectionManager] aggressively releasing JDBC connection | 2009-06-01 14:11:08,779 DEBUG [org.hibernate.jdbc.ConnectionManager] releasing JDBC connection [ (open PreparedStatements: 0, globally: 0) (open ResultSets: 0, globally: 0)] | 2009-06-01 14:11:08,779 TRACE [org.hibernate.connection.DriverManagerConnectionProvider] returning connection to pool, pool size: 1 | 2009-06-01 14:11:08,779 TRACE [org.hibernate.event.def.AbstractFlushingEventListener] post flush | 2009-06-01 14:11:08,779 TRACE [org.hibernate.transaction.CacheSynchronization] transaction before completion callback | 2009-06-01 14:11:08,779 TRACE [org.hibernate.transaction.CacheSynchronization] automatically flushing session | 2009-06-01 14:11:08,779 TRACE [org.hibernate.impl.SessionImpl] automatically flushing session | 2009-06-01 14:11:08,779 TRACE [org.hibernate.event.def.AbstractFlushingEventListener] flushing session | 2009-06-01 14:11:08,779 DEBUG [org.hibernate.event.def.AbstractFlushingEventListener] processing flush-time cascades | 2009-06-01 14:11:08,779 DEBUG [org.hibernate.event.def.AbstractFlushingEventListener] dirty checking collections | 2009-06-01 14:11:08,779 TRACE [org.hibernate.event.def.AbstractFlushingEventListener] Flushing entities and processing referenced collections | 2009-06-01 14:11:08,779 TRACE [org.hibernate.event.def.AbstractFlushingEventListener] Processing unreferenced collections | 2009-06-01 14:11:08,779 TRACE [org.hibernate.event.def.AbstractFlushingEventListener] Scheduling collection removes/(re)creates/updates | 2009-06-01 14:11:08,779 DEBUG [org.hibernate.event.def.AbstractFlushingEventListener] Flushed: 0 insertions, 0 updates, 0 deletions to 1 objects | 2009-06-01 14:11:08,779 DEBUG [org.hibernate.event.def.AbstractFlushingEventListener] Flushed: 0 (re)creations, 0 updates, 0 removals to 0 collections | 2009-06-01 14:11:08,779 DEBUG [org.hibernate.pretty.Printer] listing entities: | 2009-06-01 14:11:08,779 DEBUG [org.hibernate.pretty.Printer] test.Flight{id=10, name=flightName} | 2009-06-01 14:11:08,779 TRACE [org.hibernate.event.def.AbstractFlushingEventListener] executing flush | 2009-06-01 14:11:08,779 TRACE [org.hibernate.jdbc.ConnectionManager] registering flush begin | 2009-06-01 14:11:08,779 TRACE [org.hibernate.jdbc.ConnectionManager] registering flush end | 2009-06-01 14:11:08,779 DEBUG [org.hibernate.jdbc.ConnectionManager] aggressively releasing JDBC connection | 2009-06-01 14:11:08,779 TRACE [org.hibernate.event.def.AbstractFlushingEventListener] post flush | 2009-06-01 14:11:08,779 TRACE [org.hibernate.jdbc.JDBCContext] before transaction completion | 2009-06-01 14:11:08,779 TRACE [org.hibernate.impl.SessionImpl] before transaction completion | 2009-06-01 14:11:08,779 TRACE [org.hibernate.transaction.CacheSynchronization] transaction after completion callback, status: 3 | 2009-06-01 14:11:08,779 TRACE [org.hibernate.jdbc.JDBCContext] after transaction completion | 2009-06-01 14:11:08,779 TRACE [org.hibernate.impl.SessionImpl] after transaction completion | 2009-06-01 14:11:08,779 TRACE [org.hibernate.transaction.CacheSynchronization] automatically closing session | 2009-06-01 14:11:08,779 TRACE [org.hibernate.impl.SessionImpl] automatically closing session | 2009-06-01 14:11:08,779 TRACE [org.hibernate.impl.SessionImpl] closing session | 2009-06-01 14:11:08,779 TRACE [org.hibernate.jdbc.ConnectionManager] connection already null in cleanup : no action | | View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4234435#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...