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https://issues.apache.org/jira/browse/OPENJPA-2330?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13574395#comment-13574395
]
Guillaume Chauvet commented on OPENJPA-2330:
--------------------------------------------
Hello,
So sorry I was not able to provide you with more detailed information from the
start, but unfortunately I didn't have the time yesterday as we are approaching
deadline for release of new software.
I am working on creating a unit test, however I will not be able to provide it
straight away as I haven't been able to reproduce the bug, even though our
software crashes systematically.
So I think I will first create a patch for our version of OpenJPA to rectify
the problem, then generate the unit test(s), as with the last bug report I made.
The environment we use is OpenJPA 2.2.1 in a thick client Swing (JRE 1.6_39 64
bits). We operate an Apache Derby 10.8.2.2 database in client/server mode.
Belowlisted the scenario in which the problematic memory overflow occurs in our
application:
Prerequisites:
==========
- 3 classes of entities "EntityA", "EntityB", "EntityC"
- bidirectional navigation between classes:
- Cardinality OneToMany between EntityA and EntityB with the
following parameters: fetch = FetchType.EAGER, mappedBy = "entitya",
orphanRemoval = true, cascade = CascadeType.ALL
- Cardinality OneToMany between EntityB and EntityC with the
following parameters: fetch = FetchType.EAGER, mappedBy = "entityb",
orphanRemoval = true, cascade = CascadeType.ALL
- EntityC is associated with alot of other tables, which I
won't list for now.
Parameterization of OpenJPA:
==========
<properties>
<property name="openjpa.InverseManager" value="true"/>
<property name="openjpa.RuntimeUnenhancedClasses" value="supported"/>
<property name="openjpa.jdbc.SchemaFactory"
value="native(ForeignKeys=true)"/>
<property name="openjpa.jdbc.MappingDefaults"
value="ForeignKeyDeleteAction=restrict, JoinForeignKeyDeleteAction=restrict"/>
<property name="openjpa.Multithreaded" value="true"/>
<property name="openjpa.MaxFetchDepth" value="1"/>
<property name="openjpa.NontransactionalWrite" value="true"/>
<property name="openjpa.FetchBatchSize" value="0"/>
</properties
Initial state:
==========
The data base already contains an entities tree depth level 3 organized as
follows:
* 2 instances of type "EntityA" type : A1, A2
* 2 instances of "EntityB" type : B1, B2
* 3 instances of "EntityC" type : C1, C2, C3
-> Representation of the entity linking
A1 -> [B1 -> [C1, C2]]
A2 -> [B2 -> [C3]]
Scenario:
=================
1) 2 new instances of EntityC "C4" & "C5" type occurrences are inserted into
entity B2:
* State of the graph following insertion:
A1 -> [B1 -> [C1, C2]]
A2 -> [B2 -> [C3, C4, C5]]
2) Only entities A1 & A2 are persisted in two consecutive transactions.
=> First persist on entity A1
* State of the graph following commit:
A1 -> [B1 -> [C1, C2]]
A2 -> [B2 -> []] => C3 was deleted during the
first persist (new problem which we hadn't remarked yesterday).
=> Second persist on entity A2
* State of the graph following insertion:
A1 -> [B1 -> [C1, C2]]
A2 -> [B2 -> [C4, C5]] => Memory overflow,
causing loss of entities C4, C5.
Urgent solution
=================
We are going to create a homemade corrective patch in order to mark the
relations crossed between entities in the «OpenJPAPersistenceUtil » class in
order to avoid all looping.
> Stackoverflow due to endless recursive calls
> --------------------------------------------
>
> Key: OPENJPA-2330
> URL: https://issues.apache.org/jira/browse/OPENJPA-2330
> Project: OpenJPA
> Issue Type: Bug
> Affects Versions: 2.2.0, 2.2.1
> Reporter: Guillaume Chauvet
> Priority: Critical
>
> We wish to report another bug that generates a memory overflow resulting in
> an infinite recursive loop. Here are two stacktraces apparently from the same
> bug:
> First stacktrace sample :
> ================================================
> Exception in thread "AWT-EventQueue-0" java.lang.StackOverflowError
> at java.util.LinkedHashMap$KeyIterator.<init>(LinkedHashMap.java:383)
> at java.util.LinkedHashMap$KeyIterator.<init>(LinkedHashMap.java:383)
> at java.util.LinkedHashMap.newKeyIterator(LinkedHashMap.java:396)
> at java.util.HashMap$KeySet.iterator(HashMap.java:874)
> at java.util.HashSet.iterator(HashSet.java:153)
> at
> org.apache.openjpa.util.java$util$LinkedHashSet$proxy.iterator(Unknown Source)
> at java.util.AbstractCollection.toArray(AbstractCollection.java:120)
> at
> org.apache.openjpa.persistence.OpenJPAPersistenceUtil.isLoadedCollection(OpenJPAPersistenceUtil.java:240)
> at
> org.apache.openjpa.persistence.OpenJPAPersistenceUtil.isLoadedField(OpenJPAPersistenceUtil.java:212)
> at
> org.apache.openjpa.persistence.OpenJPAPersistenceUtil.isLoaded(OpenJPAPersistenceUtil.java:161)
> at
> org.apache.openjpa.persistence.OpenJPAPersistenceUtil.isLoadedArray(OpenJPAPersistenceUtil.java:265)
> at
> org.apache.openjpa.persistence.OpenJPAPersistenceUtil.isLoadedCollection(OpenJPAPersistenceUtil.java:242)
> at
> org.apache.openjpa.persistence.OpenJPAPersistenceUtil.isLoadedField(OpenJPAPersistenceUtil.java:212)
> at
> org.apache.openjpa.persistence.OpenJPAPersistenceUtil.isLoaded(OpenJPAPersistenceUtil.java:161)
> at
> org.apache.openjpa.persistence.OpenJPAPersistenceUtil.isLoadedField(OpenJPAPersistenceUtil.java:223)
> at
> org.apache.openjpa.persistence.OpenJPAPersistenceUtil.isLoaded(OpenJPAPersistenceUtil.java:161)
> at
> org.apache.openjpa.persistence.OpenJPAPersistenceUtil.isLoadedField(OpenJPAPersistenceUtil.java:223)
> at
> org.apache.openjpa.persistence.OpenJPAPersistenceUtil.isLoaded(OpenJPAPersistenceUtil.java:161)
> at
> org.apache.openjpa.persistence.OpenJPAPersistenceUtil.isLoadedArray(OpenJPAPersistenceUtil.java:265)
> at
> org.apache.openjpa.persistence.OpenJPAPersistenceUtil.isLoadedCollection(OpenJPAPersistenceUtil.java:242)
> at
> org.apache.openjpa.persistence.OpenJPAPersistenceUtil.isLoadedField(OpenJPAPersistenceUtil.java:212)
> at
> org.apache.openjpa.persistence.OpenJPAPersistenceUtil.isLoaded(OpenJPAPersistenceUtil.java:161)
> at
> org.apache.openjpa.persistence.OpenJPAPersistenceUtil.isLoadedField(OpenJPAPersistenceUtil.java:223)
> at
> org.apache.openjpa.persistence.OpenJPAPersistenceUtil.isLoaded(OpenJPAPersistenceUtil.java:161)
> [...]
> Second stacktrace sample :
> ================================================
> Exception in thread "AWT-EventQueue-0" java.lang.StackOverflowError
> at java.util.HashMap$EntrySet.size(HashMap.java:963)
> at
> org.apache.openjpa.util.ProxyMaps$ProxyEntrySetImpl.size(ProxyMaps.java:255)
> at java.util.AbstractCollection.toArray(AbstractCollection.java:119)
> at
> org.apache.openjpa.persistence.OpenJPAPersistenceUtil.isLoadedMap(OpenJPAPersistenceUtil.java:288)
> at
> org.apache.openjpa.persistence.OpenJPAPersistenceUtil.isLoadedField(OpenJPAPersistenceUtil.java:215)
> at
> org.apache.openjpa.persistence.OpenJPAPersistenceUtil.isLoaded(OpenJPAPersistenceUtil.java:161)
> at
> org.apache.openjpa.persistence.OpenJPAPersistenceUtil.isLoadedArray(OpenJPAPersistenceUtil.java:265)
> at
> org.apache.openjpa.persistence.OpenJPAPersistenceUtil.isLoadedCollection(OpenJPAPersistenceUtil.java:242)
> at
> org.apache.openjpa.persistence.OpenJPAPersistenceUtil.isLoadedField(OpenJPAPersistenceUtil.java:212)
> at
> org.apache.openjpa.persistence.OpenJPAPersistenceUtil.isLoaded(OpenJPAPersistenceUtil.java:161)
> at
> org.apache.openjpa.persistence.OpenJPAPersistenceUtil.isLoadedArray(OpenJPAPersistenceUtil.java:265)
> at
> org.apache.openjpa.persistence.OpenJPAPersistenceUtil.isLoadedCollection(OpenJPAPersistenceUtil.java:242)
> at
> org.apache.openjpa.persistence.OpenJPAPersistenceUtil.isLoadedField(OpenJPAPersistenceUtil.java:212)
> at
> org.apache.openjpa.persistence.OpenJPAPersistenceUtil.isLoaded(OpenJPAPersistenceUtil.java:161)
> at
> org.apache.openjpa.persistence.OpenJPAPersistenceUtil.isLoadedField(OpenJPAPersistenceUtil.java:223)
> at
> org.apache.openjpa.persistence.OpenJPAPersistenceUtil.isLoaded(OpenJPAPersistenceUtil.java:161)
> at
> org.apache.openjpa.persistence.OpenJPAPersistenceUtil.isLoadedField(OpenJPAPersistenceUtil.java:223)
> at
> org.apache.openjpa.persistence.OpenJPAPersistenceUtil.isLoaded(OpenJPAPersistenceUtil.java:161)
> [...]
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