Can not retrieve M-to-M data when DataCache is on
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Key: OPENJPA-589
URL: https://issues.apache.org/jira/browse/OPENJPA-589
Project: OpenJPA
Issue Type: Bug
Components: datacache
Reporter: Fay Wang
When DataCahe is on, the retrieval of M-to-M data will fail with the following
exception:
<openjpa-1.0.1-r420667:592145 fatal user error>
org.apache.openjpa.persistence.ArgumentException: Could not locate metadata for
the class using oid "10=10" of type "class java.util.HashMap$Entry".
Registered oid type mappings: "{class org.apache.openjpa.util.IntId=class
dw.EntityB, class java.util.HashMap$Entry=null}"
FailedObject: 10=10 [java.util.HashMap$Entry]
at
org.apache.openjpa.meta.MetaDataRepository.getMetaData(MetaDataRepository.java:986)
at
org.apache.openjpa.kernel.BrokerImpl.newStateManagerImpl(BrokerImpl.java:1121)
at org.apache.openjpa.kernel.BrokerImpl.findAll(BrokerImpl.java:913)
at org.apache.openjpa.kernel.BrokerImpl.findAll(BrokerImpl.java:862)
at
org.apache.openjpa.kernel.AbstractPCData.toRelationFields(AbstractPCData.java:214)
at
org.apache.openjpa.kernel.AbstractPCData.toNestedFields(AbstractPCData.java:181)
at
org.apache.openjpa.kernel.AbstractPCData.toField(AbstractPCData.java:95)
at org.apache.openjpa.kernel.PCDataImpl.loadField(PCDataImpl.java:197)
at org.apache.openjpa.kernel.PCDataImpl.load(PCDataImpl.java:167)
at
org.apache.openjpa.datacache.DataCacheStoreManager.load(DataCacheStoreManager.java:373)
at
org.apache.openjpa.kernel.DelegatingStoreManager.load(DelegatingStoreManager.java:116)
at
org.apache.openjpa.kernel.ROPStoreManager.load(ROPStoreManager.java:78)
at
org.apache.openjpa.kernel.StateManagerImpl.loadFields(StateManagerImpl.java:2867)
at
org.apache.openjpa.kernel.StateManagerImpl.loadField(StateManagerImpl.java:2945)
at
org.apache.openjpa.kernel.StateManagerImpl.beforeAccessField(StateManagerImpl.java:1449)
at
org.apache.openjpa.kernel.StateManagerImpl.accessingField(StateManagerImpl.java:1434)
at dw.EntityE.pcGetentityf(EntityE.java)
at dw.EntityE.print(EntityE.java:32)
at dw.Test3.main(Test3.java:49)
The test case to reproduce this error is:
EntityManagerFactory emf = Persistence
.createEntityManagerFactory("Test1");
EntityManager em = emf.createEntityManager();
em.getTransaction().begin();
EntityE e1 = new EntityE();
e1.setId(1);
e1.setName("ABC");
em.persist(e1);
EntityE e2 = new EntityE();
e2.setId(2);
e2.setName("DEF");
em.persist(e2);
EntityF f1 = new EntityF();
f1.setId(10);
em.persist(f1);
EntityF f2 = new EntityF();
f2.setId(20);
em.persist(f2);
e1.getEntityF().put(f1.getId(), f1);
e1.getEntityF().put(f2.getId(), f2);
e2.getEntityF().put(f1.getId(), f1);
e2.getEntityF().put(f2.getId(), f2);
f1.getEntityE().put(e1.getName(), e1);
f1.getEntityE().put(e2.getName(), e2);
f2.getEntityE().put(e1.getName(), e1);
f2.getEntityE().put(e2.getName(), e2);
e1.print();
e2.print();
f1.print();
f2.print();
em.getTransaction().commit();
em.close();
em = emf.createEntityManager();
EntityE e1a = em.find(EntityE.class, 1);
e1a.getEntityf(); <=========
exception is thrown here
EntityE e2a = em.find(EntityE.class, 2);
e2a.getEntityf();
EntityF f1a = em.find(EntityF.class, 10);
f1a.getEntitye();
EntityF f2a = em.find(EntityF.class, 20);
f2a.getEntitye();
Note that this test case created 4 entities:
EnityE: e1 (id = 1), e2 (id = 2),
EntityF: f1 (id = 10), f2 (id = 20)
EntityE has a field entityf, which is a Map<Integer, EntityF>
EntityF has a field entitye, which is a Map<String, EntityE>
In this test case, entityf of e1 contains <10, f1>, and <20, f2>. The same for
entityf of e2. On the other hand,
entitye of f1 contains<"ABC", e1>, and <"DEF", e2>. The same for entitye of f2.
When DataCache is on, e1, e2, f1, and f2 are all stored in the data cache. Note
that for the field of entityf in e1 and e2,
the value of Map (<10, object id of f1>, <20, object id of f2> is store in the
datacache. For the field of entitye in f1 and f2,
the value of Map(<"ABC", object id of e1>, <"DEF", object id of e2> is stored
in the data cache.
The cause of the exception shown above occurs when the value of the Map is to
be retrieved from the data cache.
Specifically, it happens in AbstractPCData.toField. The keys of the Map are
correctly retrieved while the values of the
Map are handled incorrectly. The attached patch fixes this problem.
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