[hibernate-issues] [Hibernate-JIRA] Created: (HHH-6813) @Id @OneToOne cause NullPointerException during query

[Alfio (JIRA)]

@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: 4.0.0.CR5, 3.6.8
         Environment: Hibernate 4.0.0.CR5, PostgreSQL 9.1.1, Glassfish 3.1.1
            Reporter: Alfio
         Attachments: 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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