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

[Kyrill Alyoshin (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-5534?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=38294#action_38294 ] 

Kyrill Alyoshin commented on HHH-5534:
--------------------------------------

The last paragraph in the description should not be there (this is a copy paste error from HHH-5473; the fix for HHH-5473 may have caused this issue).

> Regression in 3.5.5: Cascade on merge for Sets fails with transient entities 
> -----------------------------------------------------------------------------
>
>                 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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