[OPENJPA-2015] ClassCastException when base entity class has InheritanceType.SINGLE_TABLE base with multiple entity subclasses

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.2.2, 1.2.3
• Fix Version/s: 1.2.3
• Component/s: jpa
• Assignee: Albert Lee
• Reporter: Albert Lee
• Created: 09/Jun/11 20:04
• Updated: 11/Jan/12 19:45
• Resolved: 09/Jun/11 20:12

Description

If multiple entity subclasses extends a entity base class using InheritanceType.SINGLE_TABLE, with mx1 relation from base class to itself, a ClassCastException may occur when the mx1 collection is not empty due to a problem in discriminating the proper entity subclass type.

Caused by: java.lang.ClassCastException: problem.domain.InputItemRecord
at problem.domain.InputBatchHeaderRecord.pcReplaceField(InputBatchHeaderRecord.java)
at org.apache.openjpa.kernel.StateManagerImpl.replaceField(StateManagerImpl.java:3041)
at org.apache.openjpa.kernel.StateManagerImpl.storeObjectField(StateManagerImpl.java:2473)
at org.apache.openjpa.kernel.StateManagerImpl.storeObject(StateManagerImpl.java:2463)
at org.apache.openjpa.jdbc.meta.strats.RelationFieldStrategy.loadEagerJoin(RelationFieldStrategy.java:541)
at org.apache.openjpa.jdbc.meta.FieldMapping.loadEagerJoin(FieldMapping.java:807)
at org.apache.openjpa.jdbc.kernel.JDBCStoreManager.load(JDBCStoreManager.java:1052)
at org.apache.openjpa.jdbc.kernel.JDBCStoreManager.load(JDBCStoreManager.java:1012)
at org.apache.openjpa.jdbc.kernel.JDBCStoreManager.initializeState(JDBCStoreManager.java:378)
at org.apache.openjpa.jdbc.kernel.JDBCStoreManager.initialize(JDBCStoreManager.java:278)
at org.apache.openjpa.kernel.DelegatingStoreManager.initialize(DelegatingStoreManager.java:111)
at org.apache.openjpa.kernel.ROPStoreManager.initialize(ROPStoreManager.java:57)
at org.apache.openjpa.kernel.BrokerImpl.initialize(BrokerImpl.java:913)
at org.apache.openjpa.kernel.BrokerImpl.find(BrokerImpl.java:871)
... 38 more

For example:

@Entity
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(name = "DISCRIMATOR", discriminatorType = DiscriminatorType.INTEGER)
@DiscriminatorValue("99")
public class NachaInputRecord {

@Id
public long identifier;

@ManyToOne(cascade = CascadeType.MERGE,fetch=FetchType.EAGER)
@ForeignKey
@JoinColumn(name = "PARENT_ID")
private NachaInputRecord parent;
....

@Entity
@DiscriminatorValue("6")
public class InputItemRecord extends NachaInputRecord {
.....

@Entity
@DiscriminatorValue("8")
public class InputBatchControlRecord extends NachaInputRecord {
.....