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From "Vermeulen (JIRA)" <j...@apache.org>
Subject [jira] Created: (OPENJPA-1677) "InvalidStateException: Detected reentrant flush..." while building an error message for an earlier exception
Date Wed, 02 Jun 2010 16:03:38 GMT
"InvalidStateException: Detected reentrant flush..." while building an error message for an
earlier exception
-------------------------------------------------------------------------------------------------------------

                 Key: OPENJPA-1677
                 URL: https://issues.apache.org/jira/browse/OPENJPA-1677
             Project: OpenJPA
          Issue Type: Bug
          Components: kernel
    Affects Versions: 2.0.0
            Reporter: Vermeulen


This error seems to only seems turn up when several criteria are met...

I am calling entityManager.merge for a new entity that has a required ManyToOne field set
to null. This naturally gives an error like "org.apache.openjpa.persistence.InvalidStateException:
The field "test" of instance "TestEntity " contained a null value; the metadata for this field
specifies that nulls are illegal."

But under certain circumstances, while building the error message of this error a new error
occurs which masks the original error message. This message is extremely confusing to me.

When OpenJPA builds the error message for the original InvalidStateException it seems to call
the toString() method of my entity, which in it's turn gives the "Detected reentrant flush"
when:

 1) inside the toString() method of my entity I acces the id field
 2) the id field is annotated with @GeneratedValue(strategy = GenerationType.IDENTITY)

The stack trace I get is:

Exception in thread "main" <openjpa-2.0.0-r422266:935683 fatal user error> org.apache.openjpa.persistence.InvalidStateException:
Detected reentrant flush.  Make sure your flush-time instance callback methods or event listeners
do not invoke any operations that require the in-progress flush to complete.
	at org.apache.openjpa.kernel.BrokerImpl.flushSafe(BrokerImpl.java:2033)
	at org.apache.openjpa.kernel.BrokerImpl.flush(BrokerImpl.java:1808)
	at org.apache.openjpa.kernel.StateManagerImpl.assignObjectId(StateManagerImpl.java:609)
	at org.apache.openjpa.kernel.StateManagerImpl.assignField(StateManagerImpl.java:696)
	at org.apache.openjpa.kernel.StateManagerImpl.beforeAccessField(StateManagerImpl.java:1608)
	at org.apache.openjpa.kernel.StateManagerImpl.accessingField(StateManagerImpl.java:1591)
	at entities.TestEntity.pcGetid(TestEntity.java)
	at entities.TestEntity.toString(TestEntity.java:34)
	at java.text.MessageFormat.subformat(MessageFormat.java:1246)
	at java.text.MessageFormat.format(MessageFormat.java:836)
	at java.text.Format.format(Format.java:140)
	at java.text.MessageFormat.format(MessageFormat.java:812)
	at org.apache.openjpa.lib.util.Localizer$Message.getMessage(Localizer.java:277)
	at org.apache.openjpa.util.OpenJPAException.<init>(OpenJPAException.java:64)
	at org.apache.openjpa.util.UserException.<init>(UserException.java:47)
	at org.apache.openjpa.util.InvalidStateException.<init>(InvalidStateException.java:34)
	at org.apache.openjpa.kernel.SingleFieldManager.preFlush(SingleFieldManager.java:553)
	at org.apache.openjpa.kernel.SingleFieldManager.preFlush(SingleFieldManager.java:491)
	at org.apache.openjpa.kernel.StateManagerImpl.preFlush(StateManagerImpl.java:2957)
	at org.apache.openjpa.kernel.PNewState.beforeFlush(PNewState.java:40)
	at org.apache.openjpa.kernel.StateManagerImpl.beforeFlush(StateManagerImpl.java:1047)
	at org.apache.openjpa.kernel.BrokerImpl.flush(BrokerImpl.java:2077)
	at org.apache.openjpa.kernel.BrokerImpl.flushSafe(BrokerImpl.java:2037)
	at org.apache.openjpa.kernel.BrokerImpl.beforeCompletion(BrokerImpl.java:1955)
	at org.apache.openjpa.kernel.LocalManagedRuntime.commit(LocalManagedRuntime.java:81)
	at org.apache.openjpa.kernel.BrokerImpl.commit(BrokerImpl.java:1479)
	at org.apache.openjpa.kernel.DelegatingBroker.commit(DelegatingBroker.java:925)
	at org.apache.openjpa.persistence.EntityManagerImpl.commit(EntityManagerImpl.java:559)
	at MinimalExample.saveInTransaction(MinimalExample.java:41)
	at MinimalExample.failingExample(MinimalExample.java:29)
	at MinimalExample.main(MinimalExample.java:15)

Why is OpenJPA calling the toString() method anyway, this seems to be dangerous...

This second error goes away and I get the original error when I either remove the access tot
the id field inside my toString() method or when I simply use @GeneratedValue with the default
strategy.

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