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https://issues.apache.org/jira/browse/OPENJPA-146?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12473911
]
Gokhan Ergul commented on OPENJPA-146:
--------------------------------------
Alright, it did manifest itself in a different way as you guessed:
java.lang.NullPointerException
at
org.apache.openjpa.jdbc.meta.strats.EmbedValueHandler.map(EmbedValueHandler.java:50)
at
org.apache.openjpa.jdbc.meta.strats.ObjectIdValueHandler.map(ObjectIdValueHandler.java:46)
at
org.apache.openjpa.jdbc.meta.strats.HandlerStrategies.map(HandlerStrategies.java:56)
at
org.apache.openjpa.jdbc.meta.strats.HandlerFieldStrategy.map(HandlerFieldStrategy.java:77)
at
org.apache.openjpa.jdbc.meta.FieldMapping.setStrategy(FieldMapping.java:117)
...
Bit of debugging into the code:
(EmbedValueHandler.java)
protected void map(ValueMapping vm, String name, ColumnIO io,
boolean adapt, List cols, List args) {
// have to resolve embedded value to collect its columns
vm.getEmbeddedMapping().resolve(vm.MODE_META | vm.MODE_MAPPING);
...
vm .getEmbeddedMapping() returns null, since:
(ValueMetaDataImpl.java)
public ClassMetaData getEmbeddedMetaData() {
if (_embeddedMeta == null && isEmbeddedPC())
addEmbeddedMetaData();
return _embeddedMeta;
}
and
public boolean isEmbeddedPC() {
return _decCode == JavaTypes.PC && isEmbedded();
}
_decCode is JavaTypes.OID.
JavaTypes.PC was possibly overwritten by:
public boolean resolve(int mode) {
...
// oid as primary key field?
if (_decCode == JavaTypes.PC && isEmbedded()
&& _owner.isPrimaryKey() && _owner.getValue() == this)
_code = _decCode = JavaTypes.OID;
So I've changed
public boolean isEmbeddedPC() {
return _decCode == JavaTypes.PC && isEmbedded();
}
to
public boolean isEmbeddedPC() {
return (_decCode == JavaTypes.PC || _decCode == JavaTypes.OID) &&
isEmbedded();
}
seems to have fixed the problem, tho I'm not sure if it has any nasty
sideeffects.
Any comments?
> Entity enhancement fails while using EmbeddedId on a MappedSuperclass
> ---------------------------------------------------------------------
>
> Key: OPENJPA-146
> URL: https://issues.apache.org/jira/browse/OPENJPA-146
> Project: OpenJPA
> Issue Type: Bug
> Components: kernel
> Environment: openjpa 0.9.6
> Reporter: Gokhan Ergul
> Attachments: test-case.zip
>
>
> Both buildtime and runtime class enhancement fail with the following error:
> ...
> 1339 TRACE [main] openjpa.Enhance - Enhancing type "class test.B".
> Exception in thread "main" <0|false|0.9.6-incubating>
> org.apache.openjpa.util.GeneralException: null
> at org.apache.openjpa.enhance.PCEnhancer.run(PCEnhancer.java:350)
> at org.apache.openjpa.enhance.PCEnhancer.run(PCEnhancer.java:3711)
> at org.apache.openjpa.enhance.PCEnhancer.run(PCEnhancer.java:3661)
> at org.apache.openjpa.enhance.PCEnhancer.main(PCEnhancer.java:3633)
> Caused by: java.lang.NullPointerException
> at
> org.apache.openjpa.enhance.PCEnhancer.enhanceObjectId(PCEnhancer.java:2745)
> at org.apache.openjpa.enhance.PCEnhancer.run(PCEnhancer.java:338)
> ... 3 more
> Test code as follows:
> test/A.java:
> --------------
> package test;
> import javax.persistence.*;
> import java.io.Serializable;
> @MappedSuperclass
> abstract public class A {
> @Embeddable
> public static class A_PK implements Serializable {
> @Basic
> protected int id1;
>
> @Basic
> protected String id2;
>
> public boolean equals (Object other) {
> return false;
> }
> public int hashCode () {
> return 0;
> }
> }
> @EmbeddedId
> protected A_PK pk;
> @Basic
> protected String val;
> }
> --------------
> test/B.java:
> --------------
> package test;
> import javax.persistence.Entity;
> @Entity
> public class B extends A {
> }
> --------------
> META-INF/persistence.xml:
> --------------
> <persistence xmlns="http://java.sun.com/xml/ns/persistence";
> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
> xsi:schemaLocation="http://java.sun.com/xml/ns/persistence/orm
> http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd";
> version="1.0">
> <persistence-unit name="TestService" transaction-type="RESOURCE_LOCAL">
> <class>test.A$A_PK</class>
> <class>test.A</class>
> <class>test.B</class>
> <properties>
> <property name="openjpa.Log" value="DefaultLevel=TRACE"/>
> <property name="openjpa.ConnectionUserName" value="test"/>
> <property name="openjpa.ConnectionPassword" value="test"/>
> <property name="openjpa.ConnectionURL"
> value="jdbc:mysql://localhost:3306/oam?useServerPrepStmts=false"/>
> <property name="openjpa.ConnectionDriverName"
> value="com.mysql.jdbc.Driver"/>
> </properties>
> </persistence-unit>
> </persistence>
> --------------
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