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From "Piotr Klimczak (JIRA)" <>
Subject [jira] [Updated] (OPENJPA-2422) ClassMapping and it's strategy will never get initialized due to some synchronizatin/wrong initializaion order problems
Date Wed, 21 Aug 2013 08:30:51 GMT


Piotr Klimczak updated OPENJPA-2422:

    Affects Version/s: 2.2.0
> ClassMapping and it's strategy will never get initialized due to some synchronizatin/wrong
initializaion order problems
> -----------------------------------------------------------------------------------------------------------------------
>                 Key: OPENJPA-2422
>                 URL:
>             Project: OpenJPA
>          Issue Type: Bug
>          Components: jpa, kernel
>    Affects Versions: 2.2.0, 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
> 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
>         at org.apache.openjpa.kernel.StateManagerImpl.replaceField(
>         at org.apache.openjpa.kernel.StateManagerImpl.storeObjectField(
>         at org.apache.openjpa.kernel.StateManagerImpl.storeObject(
>         at org.apache.openjpa.jdbc.kernel.JDBCStoreManager.setMappedBy(
>         at org.apache.openjpa.jdbc.kernel.JDBCStoreManager.initializeState(
>         at org.apache.openjpa.jdbc.kernel.JDBCStoreManager.initialize(
>         at org.apache.openjpa.kernel.DelegatingStoreManager.initialize(
>         at org.apache.openjpa.kernel.ROPStoreManager.initialize(
>         at org.apache.openjpa.kernel.BrokerImpl.initialize(
>         at org.apache.openjpa.kernel.BrokerImpl.find(
>         ... 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
>      * 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
> 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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