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https://issues.apache.org/jira/browse/OPENJPA-1256?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12745216#action_12745216
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Fay Wang commented on OPENJPA-1256:
-----------------------------------
The specific ClassCastException is:
java.lang.ClassCastException: BType cannot be cast to
org.apache.openjpa.util.ObjectId
test.EntityB.pcCopyKeyFieldsToObjectId(EntityB.java)
org.apache.openjpa.enhance.PCRegistry.copyKeyFieldsToObjectId(PCRegistry.java:172)
org.apache.openjpa.util.ApplicationIds.fromPKValues(ApplicationIds.java:219)
org.apache.openjpa.jdbc.meta.ClassMapping.getObjectId(ClassMapping.java:216)
org.apache.openjpa.jdbc.meta.ClassMapping.getObjectId(ClassMapping.java:147)
org.apache.openjpa.jdbc.kernel.JDBCStoreManager.load(JDBCStoreManager.java:934)
org.apache.openjpa.jdbc.sql.AbstractResult.load(AbstractResult.java:280)
org.apache.openjpa.jdbc.sql.SelectImpl$SelectResult.load(SelectImpl.java:2349)
org.apache.openjpa.jdbc.meta.strats.RelationToManyInverseKeyFieldStrategy.loadElement(RelationToManyInverseKeyFieldStrategy.java:87)
org.apache.openjpa.jdbc.meta.strats.StoreCollectionFieldStrategy.load(StoreCollectionFieldStrategy.java:554)
org.apache.openjpa.jdbc.meta.FieldMapping.load(FieldMapping.java:919)
org.apache.openjpa.jdbc.kernel.JDBCStoreManager.load(JDBCStoreManager.java:641)
org.apache.openjpa.kernel.DelegatingStoreManager.load(DelegatingStoreManager.java:116)
org.apache.openjpa.kernel.ROPStoreManager.load(ROPStoreManager.java:78)
org.apache.openjpa.kernel.StateManagerImpl.loadFields(StateManagerImpl.java:3035)
org.apache.openjpa.kernel.StateManagerImpl.loadField(StateManagerImpl.java:3113)
org.apache.openjpa.kernel.StateManagerImpl.beforeAccessField(StateManagerImpl.java:1606)
> get java.lang.ClassCastException when IdClass contains an Enum Field
> --------------------------------------------------------------------
>
> Key: OPENJPA-1256
> URL: https://issues.apache.org/jira/browse/OPENJPA-1256
> Project: OpenJPA
> Issue Type: Bug
> Components: kernel
> Affects Versions: 2.0.0
> Reporter: Fay Wang
> Fix For: 2.0.0
>
>
> Suppose EntityA and EntityB are defined as follows:
> @Entity
> class EntityA {
> @Id
> int id;
>
> @OneToOne(fetch=fetchType=LAZE)
> EntityB entityB;
>
> ...
> }
> @Entity
> @IdClass(BId.class)
> class EntityB {
> @Id
> int intId;
> @Id
> BType bType;
> ...
> public enum BType { A1, A2, A3, A4 };
> ...
> }
> ClassCast Exception is thrown in the following situation:
> EntityA a = em.find(EntityA.class, 1)
> EntityB b = a.getEntityB();
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