[OPENJPA-2728] Metamodel generation of entity or mapped superclass

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Fix Version/s: 3.2.3
• Assignee: Unassigned
• Reporter: Karl-Philipp Richter
• Created: 03/Feb/18 21:15
• Updated: 16/Mar/22 07:41

Description

A simple entity or mapped superclass with a generic type parameter causes the metamodel generation to fail because of syntax errors, e.g.

@MappedSuperclass
public abstract class MyEntity2<T extends MyEntity> implements Serializable {
    private static final long serialVersionUID = 1L;
    @Id
    @GeneratedValue
    private Long id;
    private T myEntity;

causes the generation of

import java.lang.Long;
import javax.persistence.metamodel.SingularAttribute;

@javax.persistence.metamodel.StaticMetamodel
(value=richtercloud.openjpa.generic.metamodel.MyEntity2.class)
@javax.annotation.Generated
(value="org.apache.openjpa.persistence.meta.AnnotationProcessor6",date="Sat Feb 03 20:59:32 CET 2018")
public class MyEntity2_ {
    public static volatile SingularAttribute<MyEntity2,Long> id;
    public static volatile SingularAttribute<MyEntity2,T> myEntity;
}

which is invalid because `T` isn't specified and thus unknown to the compiler.

A SSCCE is provided at https://gitlab.com/krichter/openjpa-generic-metamodel.

experienced with 3.0.0-SNAPSHOT