[hibernate-issues] [Hibernate-JIRA] Created: (HHH-5534) Regression in 3.5.5: Cascade on merge for Sets fails with transient entities

[Kyrill Alyoshin (JIRA)]

Regression in 3.5.5: Cascade on merge for Sets fails with transient entities 
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                 Key: HHH-5534
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-5534
             Project: Hibernate Core
          Issue Type: Bug
          Components: core
    Affects Versions: 3.5.5
         Environment: Hibernate 3.5.5, Oracle 10g.
            Reporter: Kyrill Alyoshin


Something happened from 3.5.4 to 3.5.5. Here is regression issue we're experiencing after upgrade:

We have entities ResearchClientFile and ResearchVendorRecord.

RCF maps RVR:

@Sort(type = SortType.NATURAL)
    @OneToMany(mappedBy = "file", fetch = FetchType.LAZY, cascade = CascadeType.ALL)
    public SortedSet<ResearchVendorRecord> getRecords() {
        return records;
    }

RVR maps RCF:

@ManyToOne(fetch = FetchType.LAZY, optional = false)
    @JoinColumn(name = "research_client_file_id")
    public ResearchClientFile getFile() {
        return file;
    }

The following unit test:

ResearchClientFile rcf = RandomUtils.randomBean(ResearchClientFile.class);
rcf.addRecord(RandomUtils.randomBean(ResearchVendorRecord.class));
rcf = session.merge(rcf);

produces the following exception in 3.5.5 but not in 3.5.4.:

java.lang.NullPointerException: null entities are not supported by org.hibernate.event.def.EventCache
	at org.hibernate.event.def.EventCache.containsKey(EventCache.java:80)
	at org.hibernate.event.def.DefaultMergeEventListener.mergeTransientEntity(DefaultMergeEventListener.java:361)
	at org.hibernate.event.def.DefaultMergeEventListener.entityIsTransient(DefaultMergeEventListener.java:303)
	at org.hibernate.event.def.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:258)
	at org.hibernate.impl.SessionImpl.fireMerge(SessionImpl.java:869)


equals, hashCode and compareTo are completely consistent in RVR. 

The issue seems to affects only Set and SortedSets and on merge only. Lists (with bag semantics) do not appear to be affected on merge.

Of all the things touch in 3.5.5 (according to the changelog) this issue seems to be the only one dealing with merge functionality, so I decided to put a comment here. I will also create a bug that described this in detail.

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