Revision as of 15:27, 5 January 2009

Bug Analysis Document: 256277: Endless loop on @PrePersist using a nested Persist

• Bugzilla Bug 256277
• EclipseLink Users Newsgroup posting

Document History

Overview

This bug is encountered when a secondary persist is executed inside of a @PrePersist callback method on the Entity being itself persisted.

Concepts

JPA Specification Notes

Here is what the JPA specification says about performing persists inside the @PrePersist method.

JPA 1.0 Specification

• P58 Section 3.5
  • "In general, portable applications should not invoke EntityManager or Query operations, access other entity instances, or modify relationships in a lifecycle callback method.[19]"
  • "[19] The semantics of such operations may be standardized in a future release of this specification."

JPA 2.0 Specification

• P82 Section 3.5.1
  • "In general, portable applications should not invoke EntityManager or Query operations, access other entity instances, or modify relationships within the same persistence context.[34] A lifecycle callback method may modify the non-relationship state of the entity on which it is invoked."
  • "[34] The semantics of such operations may be standardized in a future release of this specification."

Reproduction

Prerequisites

• Run tests out of container on an SE persitence unit
• Two different entity classes are required
• Test must commit more than one object so that the non-performance else clause in CommitManager.commitAllObjectsWithChangeSet() is used
• Test must perform a change on an existing object that is already persisted
• Set FlushMode
  • entityManager.setFlushMode(FlushModeType.AUTO);
  • Set @PrePersist method callback on Entity that performs its own read query

@Entity
public class Leaf implements Serializable {
    @PrePersist
    // 256277: test prePersist
    public void prePersist() {
        setState("0000");
    }

Use Case 1: Persist other Entity inside @PrePersist callback

Use Case 2: Persist c

Analysis Constraints

Issue 1: Verify that Entity containing the @PrePersist callback has been registered

Design / Functionality

Testing

Use Case 1: Output

The following logs and stacktrace illustrate the current infinite loop behavior when performing a @PrePersist inside a @PrePersist as a result of a persist in this callback method.

StackTrace

Logs

API

GUI

Config files

Documentation

Open Issues

This section lists the open issues that are still pending that must be decided prior to fully implementing this project's requirements.

Decisions

This section lists decisions made. These are intended to document the resolution of open issues or constraints added to the project that are important.

Future Considerations

During the research for this bug, the following items were identified as out of scope but are captured here as potential future enhancements. If agreed upon during the review process these should be logged in the bug system.

References

Include a reference to the latest diff on the bug and the SVN revision in FishEye.

• Fisheye Revision