intended behavior of transaction.checkpoint();

[Joerg Lensing]

Hi ng,
what is the intendets behavior of "transaction.checkpoint()"?
When and how is this mehtod to be used?
when i use it, the follwing stacktrace comes up:

[org.apache.ojb.odmg.ObjectEnvelopeTable] ERROR: Commit on object level 
failed for tx [EMAIL PROTECTED]
Calling method needed transaction, but no transaction found for current 
thread :-(
org.odmg.TransactionNotInProgressException: Calling method needed 
transaction, but no transaction found for current thread :-(
   at 
org.apache.ojb.odmg.LocalTxManager.getCurrentTransaction(LocalTxManager.java:46)
   at 
org.apache.ojb.odmg.locking.LockStrategyFactory.getIsolationLevel(LockStrategyFactory.java:123)
   at 
org.apache.ojb.odmg.locking.LockStrategyFactory.getStrategyFor(LockStrategyFactory.java:94)
   at 
org.apache.ojb.odmg.locking.LockManagerDefaultImpl.upgradeLock(LockManagerDefaultImpl.java:132)
   at org.apache.ojb.odmg.TransactionImpl.lock(TransactionImpl.java:284)
   at 
org.apache.ojb.odmg.ObjectEnvelopeTable.upgradeImplicitLocksAndCheckIfCommitIsNeeded(ObjectEnvelopeTable.java:293)
   at 
org.apache.ojb.odmg.ObjectEnvelopeTable.commit(ObjectEnvelopeTable.java:183)
   at 
org.apache.ojb.odmg.TransactionImpl.doCommitOnObjects(TransactionImpl.java:342)
   at 
org.apache.ojb.odmg.TransactionImpl.checkpoint(TransactionImpl.java:459)
   at 
de.softcon.webcontrol.integration.data.ojb.OjbDAOTransactionHandler.commitProceedTransaction(OjbDAOTransactionHandler.java:72)
   at 
de.softcon.webcontrol.business.facade.EditPartnerManager.save(EditPartnerManager.java:123)

.......

   at 
org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.java:1125)
   at java.lang.Thread.run(Thread.java:536)
[org.apache.ojb.broker.accesslayer.ConnectionManagerImpl] INFO: Rollback 
was called, do rollback on current connection 
[EMAIL PROTECTED]
org.odmg.TransactionNotInProgressException: Calling method needed 
transaction, but no transaction found for current thread :-(
   at 
org.apache.ojb.odmg.LocalTxManager.getCurrentTransaction(LocalTxManager.java:46)
   at 
org.apache.ojb.odmg.locking.LockStrategyFactory.getIsolationLevel(LockStrategyFactory.java:123)
   at 
org.apache.ojb.odmg.locking.LockStrategyFactory.getStrategyFor(LockStrategyFactory.java:94)
   at 
org.apache.ojb.odmg.locking.LockManagerDefaultImpl.releaseLock(LockManagerDefaultImpl.java:143)
   at 
org.apache.ojb.odmg.TransactionImpl.removeLock(TransactionImpl.java:518)
   at org.apache.ojb.odmg.TransactionImpl.doClose(TransactionImpl.java:402)
   at 
org.apache.ojb.odmg.TransactionImpl.checkpoint(TransactionImpl.java:469)
   at 
de.softcon.webcontrol.integration.data.ojb.OjbDAOTransactionHandler.commitProceedTransaction(OjbDAOTransactionHandler.java:72)
   at 
de.softcon.webcontrol.business.facade.EditPartnerManager.save(EditPartnerManager.java:123)
   at 
de.softcon.webcontrol.business.delegate.EditPartnerDelegate.save(EditPartnerDelegate.java:179)
......
----------------- snip------------------



any tips?

joerg



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