[hibernate-issues] [Hibernate-JIRA] Created: (HHH-3043) Map in entities using @GenericGenerator(name="system-uuid", strategy = "uuid") doesn't work

[Pascal P. Pochet (JIRA)]

Map in entities using @GenericGenerator(name="system-uuid", strategy = "uuid") doesn't work
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                 Key: HHH-3043
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3043
             Project: Hibernate3
          Issue Type: Bug
          Components: core
    Affects Versions: 3.2.5
            Reporter: Pascal P. Pochet
            Priority: Blocker
         Attachments: Archive.zip

When using this entity declaration

	@Id
	@GeneratedValue
	protected long id ;
	
	@Type(type="language")
	@OneToMany(cascade=CascadeType.ALL,fetch=FetchType.LAZY)
	@MapKey(columns=@Column(name="language", length=6))
	protected java.util.Map<Language,Label>	itsLabels  = new HashMap<Language,Label>() ;

reading back of persisted Label associated with the entity works ok 
When changing to 

	@Id
	@GenericGenerator(name="system-uuid", strategy = "uuid")
	@Column(name="id", length=36)
	protected String	itsUUID = UUID.randomUUID().toString()	;
	
	@Type(type="language")
	@OneToMany(cascade=CascadeType.ALL,fetch=FetchType.LAZY)
	@MapKey(columns=@Column(name="language", length=6))
	protected java.util.Map<Language,Label>	itsLabels  = new HashMap<Language,Label>() ;

persisted Label can't be retrieved anymore (the itsLabels Map is always empty) and persisting new version of existing labels generates duplicate errors (of course...).

Tracking down the problem shows that different code is executed when the LAZY loading the map is performed, the UUID-based version generating the reading of 4 times the same Collection (there were 3 Label persisted for the test entity) and as consequence the setter is not called leaving the Label Map empty (as initialized at constructor time)

Part of the debug trace :
[java] 17:43:03,090 DEBUG CollectionLoadContext:217 - 4 collections were found in result set for role: eu.cec.sanco.sanref.valuelist.Individual.itsLabels
[java] 17:43:03,091 DEBUG CollectionLoadContext:260 - collection fully initialized: [eu.cec.sanco.sanref.valuelist.Individual.itsLabels#ac7117a2-3c0c-4d40-90ba-3bef5a5c77eb]
[java] 17:43:03,091 DEBUG CollectionLoadContext:260 - collection fully initialized: [eu.cec.sanco.sanref.valuelist.Individual.itsLabels#ac7117a2-3c0c-4d40-90ba-3bef5a5c77eb]
[java] 17:43:03,092 DEBUG CollectionLoadContext:260 - collection fully initialized: [eu.cec.sanco.sanref.valuelist.Individual.itsLabels#ac7117a2-3c0c-4d40-90ba-3bef5a5c77eb]
[java] 17:43:03,092 DEBUG CollectionLoadContext:260 - collection fully initialized: [eu.cec.sanco.sanref.valuelist.Individual.itsLabels#ac7117a2-3c0c-4d40-90ba-3bef5a5c77eb]
[java] 17:43:03,093 DEBUG CollectionLoadContext:226 - 4 collections initialized for role: eu.cec.sanco.sanref.valuelist.Individual.itsLabels
[java] 17:43:03,093 DEBUG StatefulPersistenceContext:790 - initializing non-lazy collections
[java] 17:43:03,094 DEBUG Loader:2010 - done loading collection


while on the Long id-based entity we got :

[java] 18:09:27,800 DEBUG CollectionLoadContext:217 - 1 collections were found in result set for role: eu.cec.sanco.sanref.valuelist.Individual.itsLabels
[java] 18:09:27,801 DEBUG CollectionLoadContext:260 - collection fully initialized: [eu.cec.sanco.sanref.valuelist.Individual.itsLabels#299]
[java] 18:09:27,801 DEBUG CollectionLoadContext:226 - 1 collections initialized for role: eu.cec.sanco.sanref.valuelist.Individual.itsLabels
[java] 18:09:27,802 DEBUG StatefulPersistenceContext:790 - initializing non-lazy collections
[java] 18:09:27,802 DEBUG Loader:2010 - done loading collection


Also in the trace of the UUID-based version, we see that Hibernate recursively load the mapped entity (Label)

[java] 17:43:02,906 DEBUG Loader:1852 - loading entity: [eu.cec.sanco.sanref.Label#0199f151-44f7-4704-9f09-72a42527590c]

(one "loading entity" message per persisted Label...)

while this is not happening when running the "GeneratedValue" version.




NB
The problem is not related to the usage of the UserType Language, testing as been done by going back to a more basic <String,Label> map: the problem remains identical.
By stepping in the code, possible source of the problem may be related to the "hasRowId" returned value in the UUID-based version. (not 100% sure...)

The 2 log files attached in 1 zip show the differences when lazy loading the Label map.

 

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