4:19 a.m.
[
http://opensource.atlassian.com/projects/hibernate/browse/HHH-6813?page=c...
]
Alfio commented on HHH-6813:
----------------------------
I tried to debug hiberjta test to help you to solve this problem. I compared @Id @OneToOne
tecnique with @MapsId one.
The NPE is thrown in AbstractEntityPersister.loadByUniqueKey() because uniqueKeyLoaders
map is empty. In the @MapsId case there is one uniqueKeyLoader bound to person property
(wich has the @MapsId annotation).
(PS: If I set useStaticLoader to false the test passes, but I don't think this is a
solution.)
A uniqueKeyLoader is created scanning properties in entityMetamodel. This happens in
AbstractEntityPersister.createUniqueKeyLoader() method. What I noticed is that properties
do not include identifier, hence no uniqueKeyLoader can be created for id in @Id @OneToOne
case.
I think should be added a routine to add uniqueKeyLoader in the case of @Id @OneToOne. To
do so the needed information could be extracted from
entityMetamodel.getIdentifierProperty() but in @Id @OneToOne case identifierProperty is
not set properly. For example entityMetamodel.getIdentifierProperty().getName() returns
null intead of "id".
In PropertyBinder.bind() the control enters in 'if ( isXToMany ||
entityBinder.wrapIdsInEmbeddedComponents() ) {}' block only in @Id @OneToOne case.
There are two FIXME, the problem may be here.
I hope my efforts are usefull.
@Id @OneToOne cause NullPointerException during query
-----------------------------------------------------
Key: HHH-6813
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-6813
Project: Hibernate Core
Issue Type: Bug
Components: core, entity-manager
Affects Versions: 3.6.8, 4.0.0.CR5
Environment: Hibernate 4.0.0.CR5, PostgreSQL 9.1.1, Glassfish 3.1.1
Reporter: Alfio
Labels: jpa2
Attachments: hiberjta.zip, hiberlocal.zip, hibertest.war, hibertest.zip
I've two entities, Person and PersonInfo, with a one-to-one relation:
{code:title=Person.java}
@Entity
public class Person {
@Id
private Integer id;
@Basic
private String name;
@OneToOne( mappedBy = "id" )
private PersonInfo personInfo;
...getters&setters...
}
{code}
{code:title=PersonInfo.java}
@Entity
public class PersonInfo {
@Id
@OneToOne
private Person id;
@Basic
private String info;
...getters&setters...
}
{code}
Hibernate correctly creates two tables but a NPE occours during a simple select query
(only if tables have one or more records)
em.createQuery("SELECT p FROM Person p").getResultList();
...
java.lang.NullPointerException
at
org.hibernate.persister.entity.AbstractEntityPersister.loadByUniqueKey(AbstractEntityPersister.java:2202)
at org.hibernate.type.EntityType.loadByUniqueKey(EntityType.java:661)
at org.hibernate.type.EntityType.resolve(EntityType.java:441)
at org.hibernate.engine.internal.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:150)
at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:1006)
at org.hibernate.loader.Loader.doQuery(Loader.java:883)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:289)
at org.hibernate.loader.Loader.doList(Loader.java:2463)
at org.hibernate.loader.Loader.doList(Loader.java:2449)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2279)
at org.hibernate.loader.Loader.list(Loader.java:2274)
at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:470)
at
org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:355)
at org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:196)
at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1118)
at org.hibernate.internal.QueryImpl.list(QueryImpl.java:101)
at org.hibernate.ejb.QueryImpl.getResultList(QueryImpl.java:252)
at
com.sun.enterprise.container.common.impl.QueryWrapper.getResultList(QueryWrapper.java:195)
at nogroup.hibertest.Bean.execute(Bean.java:23)
at
nogroup.hibertest.org$jboss$weld$bean-hibertest-1$0-SNAPSHOT-ManagedBean-class_nogroup$hibertest$Bean_$$_WeldClientProxy.execute(org$jboss$weld$bean-hibertest-1$0-SNAPSHOT-ManagedBean-class_nogroup$hibertest$Bean_$$_WeldClientProxy.java)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at javax.el.BeanELResolver.invokeMethod(BeanELResolver.java:737)
at javax.el.BeanELResolver.invoke(BeanELResolver.java:467)
at javax.el.CompositeELResolver.invoke(CompositeELResolver.java:254)
at com.sun.el.parser.AstValue.invoke(AstValue.java:228)
at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:297)
at
org.jboss.weld.util.el.ForwardingMethodExpression.invoke(ForwardingMethodExpression.java:43)
at org.jboss.weld.el.WeldMethodExpression.invoke(WeldMethodExpression.java:56)
at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
at
javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:88)
... 33 more
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