Hi, I previously posted about my problem on the geronimo-user mailing list, so some of you may have seen parts of this mail before. Thanks to the help of David Jencks and Jarek Gabor I was able to isolate the core of my problem and write a unit-test for OpenJPA (see attachment).
In my code I derive an entity from an interface, that uses generics:
public interface GenericEntity<PK extends Serializable> {
PK getEntityId();
void setEntityId();
}
public interface LongObjIdEntity extends GenericEntity<Long> {
}
@Entity
public class SomeEntity implements LongObjIdEntity, Serializable {
private Long entityId;
@Id
@GeneratedValue
Long getEntityId() {
return entityId;
}
void setEntityId(Long entityId) {
this.entityId = entityId;
}
}
The enhancement process of OpenJPA seems to scramble the class somehow,
so that serialized objects can no longer be deserialized. More exactly
the call
Class.getDeclaredField("entityId");
somewhere inside the computation of the serialVersionUID inside the
ObjectOutputStream.readObject() method fails with a VerifyError. This
only happens if the @Id @GeneratedValue annotations are applied to the
getter/setter for PROPERTY-access (or instead of annotations the orm.xml
contains the access-type="PROPERTY" attribute). FIELD-access produces no
problems at all.
The attached unit-test contains tests for both cases and PROPERTY-access
fails reliably with release 1.0.0 and the current SVN-version of
OpenJPA. The stacktrace is:
java.lang.VerifyError: (class:
org/apache/openjpa/persistence/generics/SomeEntityWithPropertyAccess,
method: getEntityId signature: ()Ljava/lang/Long;) Wrong return type in
function
at java.lang.Class.getDeclaredFields0(Native Method)
at java.lang.Class.privateGetDeclaredFields(Class.java:2259)
at java.lang.Class.getDeclaredField(Class.java:1852)
at
org.apache.openjpa.persistence.generics.TestEnhancementOfGenerics.testPropertyAccess(TestEnhancementOfGenerics.java:21)
Regards, Janko
generic_entity_unit_test.patch.gz
Description: GNU Zip compressed data
