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https://issues.apache.org/jira/browse/OPENJPA-2422?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Piotr Klimczak updated OPENJPA-2422:
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Attachment: OPENJPA-2422.ResolveMetaDataRepository.trace
OPENJPA-2422.ResolveClassMetaData.trace
> ClassMapping and it's strategy will never get initialized due to some
> synchronizatin problems
> ---------------------------------------------------------------------------------------------
>
> Key: OPENJPA-2422
> URL: https://issues.apache.org/jira/browse/OPENJPA-2422
> Project: OpenJPA
> Issue Type: Bug
> Components: jpa, kernel
> Affects Versions: 2.2.2
> Environment: Apache ServiceMix 4.5.2
> Reporter: Piotr Klimczak
> Priority: Blocker
> Labels: ClassCastException, ManyToOne, OneToMany, synchronization
> Attachments: OPENJPA-2422.ResolveClassMetaData.trace,
> OPENJPA-2422.ResolveMetaDataRepository.trace
>
>
> After I have switched my software to ServiceMix 4.5.2 I have faced very
> strange blocking issue.
> I have bidirection relation: OneToMany and ManyToOne that was working fine
> before switching to ServiceMix 4.5.2.
> After switching to ServiceMix 4.5.2 i am getting this Exception:
> {code}
> Caused by: java.lang.ClassCastException: org.apache.openjpa.util.LongId
> cannot be cast to XXXXXXXXXXXXXXX.PARENT
> at
> XXXXXXXXXXXXXXX.CHILD.pcReplaceField(CHILD.java)[227:XXXXXXXXXXXXXXX:4.0.1.SNAPSHOT]
> at
> org.apache.openjpa.kernel.StateManagerImpl.replaceField(StateManagerImpl.java:3213)
> at
> org.apache.openjpa.kernel.StateManagerImpl.storeObjectField(StateManagerImpl.java:2643)
> at
> org.apache.openjpa.kernel.StateManagerImpl.storeObject(StateManagerImpl.java:2633)
> at
> org.apache.openjpa.jdbc.kernel.JDBCStoreManager.setMappedBy(JDBCStoreManager.java:478)
> at
> org.apache.openjpa.jdbc.kernel.JDBCStoreManager.initializeState(JDBCStoreManager.java:404)
> at
> org.apache.openjpa.jdbc.kernel.JDBCStoreManager.initialize(JDBCStoreManager.java:306)
> at
> org.apache.openjpa.kernel.DelegatingStoreManager.initialize(DelegatingStoreManager.java:112)
> at
> org.apache.openjpa.kernel.ROPStoreManager.initialize(ROPStoreManager.java:57)
> at
> org.apache.openjpa.kernel.BrokerImpl.initialize(BrokerImpl.java:1046)
> at org.apache.openjpa.kernel.BrokerImpl.find(BrokerImpl.java:1004)
> ... 133 more
> {code}
> As I have done some debugging, it looks like as some synchronization problems
> in OpenJPA.
> I'm getting this exception, because ClassMappings are constructed and putted
> into MODE_META state, before MetaDataRepository that owns them reaches
> MODE_MAPPING_INIT. So then when MetaDataRepository reaches MODE_MAPPING_INIT
> state, all ClassMappings are already in MODE_META state and will never be
> putted into MODE_MAPPING_INIT state as implemented in resolve method in
> MetaDataRepository:
> {code}
> /**
> * Resolve the given metadata if needed. There are three goals:
> * <ol>
> * <li>Make sure no unresolved metadata gets back to the client.</li>
> * <li>Avoid infinite reentrant calls for mutually-dependent metadatas by
> allowing unresolved
> * metadata to be returned to other metadatas.</li>
> * <li>Always make sure the superclass metadata is resolved before the
> subclass metadata so that
> * the subclass can access the super's list of fields.</li>
> * </ol>
> * Note that the code calling this method is synchronized, so this method
> doesn't have to be.
> */
> private void resolve(ClassMetaData meta) {
> // return anything that has its metadata resolved, because that means
> // it is either fully resolved or must at least be in the process of
> // resolving mapping, etc since we do that right after meta resolve
> if (meta == null || _resMode == MODE_NONE || (meta.getResolve() &
> MODE_META) != 0)
> return;
> {code}
> So it makes ClassMapping's strategy impossible to initialize, once it reaches
> MODE_META state.
> Due to above problem for example the RelationFieldStrategy will never get
> initialized, so then the FieldMetadata has _intermediate filed set to false
> which causes OpenJPA to set a LongId value to the field of type PARENT.
> In my case, this is a blocker.
> Unfortunately i am not able to write a testcase for this bug due to both: do
> not have a time for this and scenerio is way too complex- multithreaded app.
> In my case problem occurs in aprox 95% app starts.
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