[CAY-1749] NPE on simple nested context commit

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.1B2
• Fix Version/s: 3.1B2, 3.2.M1
• Component/s: Core Library
• Assignee: Andrus Adamchik
• Reporter: Andrus Adamchik
• Created: 21/Oct/12 09:30
• Updated: 21/Oct/12 10:55
• Resolved: 21/Oct/12 10:55

Description

An odd problem happens when building on Jenkins. E.g. this build (Java 7, HSQLDB) :

https://builds.apache.org/job/Cayenne-trunk/cayenneTestConnection=HSQLDB,jdk=JDK%201.7%20%28latest%29,label=Ubuntu/781/

results in the following exception:
-------------------------------------------------------------------------------
Test set: org.apache.cayenne.access.NestedDataContextWriteTest
-------------------------------------------------------------------------------
Tests run: 11, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.151 sec <<< FAILURE!
testAddRemove(org.apache.cayenne.access.NestedDataContextWriteTest) Time elapsed: 0.012 sec <<< ERROR!
java.lang.NullPointerException
at org.apache.commons.collections.map.AbstractReferenceMap$ReferenceEntry.getValue(AbstractReferenceMap.java:597)
at org.apache.commons.collections.map.AbstractReferenceMap.get(AbstractReferenceMap.java:234)
at org.apache.cayenne.access.ObjectStore.postprocessAfterCommit(ObjectStore.java:417)
at org.apache.cayenne.access.DataContext.flushToParent(DataContext.java:771)
at org.apache.cayenne.access.DataContext.commitChanges(DataContext.java:697)
at org.apache.cayenne.access.NestedDataContextWriteTest.testAddRemove(NestedDataContextWriteTest.java:632)

The code is as vanilla and single threaded as it gets:

DataContext context = createDataContext();
ObjectContext child = runtime.getContext(context);

Artist a = child.newObject(Artist.class);
a.setArtistName("X");
child.commitChanges(); // this is line 632 that causes exception

It appears that ObjectStore.objectMap somehow gets corrupted... Sure enough it is only reproducible on Jenkins, and never - locally.