[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-3441) Null pointer exception on org.hibernate.type.AbstractType.getHashCode(AbstractType.java:112)
Muammer Yucel (JIRA)
noreply at atlassian.com
Fri Jan 7 07:45:05 EST 2011
[ http://opensource.atlassian.com/projects/hibernate/browse/HHH-3441?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=39505#action_39505 ]
Muammer Yucel commented on HHH-3441:
------------------------------------
I encountered to this problem and after debug I saw that hibernate tries to calculate hascode with IDs of other persistent entities. Since they are transient at the moment and ids are not generated, NPE is thrown. Why does hibernate use IDs instead of using Object's hashCode() method to get hash code of the entity?
> Null pointer exception on org.hibernate.type.AbstractType.getHashCode(AbstractType.java:112)
> --------------------------------------------------------------------------------------------
>
> Key: HHH-3441
> URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3441
> Project: Hibernate Core
> Issue Type: Bug
> Components: core
> Affects Versions: 3.2.5
> Environment: Hibernate 3.25., Oracle 10g, Spring 2.5.5
> Reporter: DEROUET
> Priority: Blocker
>
> The issue concerns a problem already signaled in different forums, and I decided to report it in JIRA, because many people have this same problem and after days and days of work around, the solutions possibles are heavy or dangerous for a database integrity (for example remove a non-nullability constraint...).
> Here it is the problem a previous forum participant had perfectly summarized (see http://opensource.atlassian.com/projects/hibernate/browse/HHH-2326):
> A null pointer exception is thrown when:
> a) we have a composite key with one of the attributes of the key being an FK to another persistent class.
> b) The other persistent class has an ID field whose value is being generated.
> c) The instance of the other persistent class is transient (does not yet have an ID)
> We do not get the null pointer if we explicitly set the ID (generator=assigned)
> Here it is the failure trace:
> -->
> -->
> java.lang.NullPointerException
> at org.hibernate.type.AbstractType.getHashCode(AbstractType.java:112)
> at org.hibernate.type.AbstractType.getHashCode(AbstractType.java:120)
> at org.hibernate.type.EntityType.getHashCode(EntityType.java:279)
> at org.hibernate.type.ComponentType.getHashCode(ComponentType.java:189)
> at org.hibernate.engine.EntityKey.generateHashCode(EntityKey.java:104)
> at org.hibernate.engine.EntityKey.<init>(EntityKey.java:48)
> at org.hibernate.engine.StatefulPersistenceContext.getDatabaseSnapshot(StatefulPersistenceContext.java:240)
> at org.hibernate.engine.ForeignKeys.isTransient(ForeignKeys.java:189)
> at org.hibernate.event.def.AbstractSaveEventListener.getEntityState(AbstractSaveEventListener.java:512)
> at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:80)
> at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:70)
> at org.hibernate.impl.SessionImpl.fireSaveOrUpdate(SessionImpl.java:507)
> at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:499)
> at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:495)
> at org.springframework.orm.hibernate3.HibernateTemplate$16.doInHibernate(HibernateTemplate.java:747)
> at org.springframework.orm.hibernate3.HibernateTemplate.doExecute(HibernateTemplate.java:419)
> at org.springframework.orm.hibernate3.HibernateTemplate.executeWithNativeSession(HibernateTemplate.java:374)
> at org.springframework.orm.hibernate3.HibernateTemplate.saveOrUpdate(HibernateTemplate.java:744)
> at eu.cec.argus.bcm.dao.businessContinuityEvent.BusinessContinuityEventDAOImpl.createBCEvent(BusinessContinuityEventDAOImpl.java:39)
> at eu.cec.argus.bcm.dao.businessContinuityEvent.BusinessContinuityEventDAOTest.testSaveBcEventAndRelatedMessagesAndMeetings(BusinessContinuityEventDAOTest.java:127)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:585)
> at org.springframework.test.context.junit4.SpringTestMethod.invoke(SpringTestMethod.java:198)
> at org.springframework.test.context.junit4.SpringMethodRoadie.runTestMethod(SpringMethodRoadie.java:274)
> at org.springframework.test.context.junit4.SpringMethodRoadie$2.run(SpringMethodRoadie.java:207)
> at org.springframework.test.context.junit4.SpringMethodRoadie.runBeforesThenTestThenAfters(SpringMethodRoadie.java:254)
> at org.springframework.test.context.junit4.SpringMethodRoadie.runWithRepetitions(SpringMethodRoadie.java:234)
> at org.springframework.test.context.junit4.SpringMethodRoadie.runTest(SpringMethodRoadie.java:204)
> at org.springframework.test.context.junit4.SpringMethodRoadie.run(SpringMethodRoadie.java:146)
> at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.invokeTestMethod(SpringJUnit4ClassRunner.java:151)
> at org.junit.internal.runners.JUnit4ClassRunner.runMethods(JUnit4ClassRunner.java:51)
> at org.junit.internal.runners.JUnit4ClassRunner$1.run(JUnit4ClassRunner.java:44)
> at org.junit.internal.runners.ClassRoadie.runUnprotected(ClassRoadie.java:26)
> at org.junit.internal.runners.ClassRoadie.runProtected(ClassRoadie.java:36)
> at org.junit.internal.runners.JUnit4ClassRunner.run(JUnit4ClassRunner.java:42)
> at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:38)
> at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
> at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
> at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
> at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
> at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)
> Here they are my classes:
> @Entity
> @Table(name = "BCM_BC_EVENT")
> @IdClass(BusinessContinuityEvent.BusinessContinuityEventId.class)
> @SequenceGenerator(name = "Generator.BusinessContinuityEvent", sequenceName = "SEQ_BCM_BC_EVENT")
> public class BusinessContinuityEvent implements Serializable {
> @Embeddable
> public static class BusinessContinuityEventId implements Serializable {
>
> private static final long serialVersionUID = 3513299649110908676L;
> @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "Generator.BusinessContinuityEvent")
> @Column(name = "BCE_ID", insertable = false, updatable = false, nullable = false)
> private Long id;
>
> @ManyToOne(fetch = FetchType.LAZY, cascade = {CascadeType.PERSIST, CascadeType.REFRESH, CascadeType.MERGE})
> @Cascade(org.hibernate.annotations.CascadeType.SAVE_UPDATE)
> @JoinColumn(name = "EVE_ID", referencedColumnName = "EVE_ID", nullable = false)
> private Event event;
>
> public BusinessContinuityEventId(){
>
> }
>
> public BusinessContinuityEventId(Long id, Event event) {
> this.id = id;
> this.event = event;
> }
> public Long getId() {
> return id;
> }
> public void setId(Long id) {
> this.id = id;
> }
> public Event getEvent() {
> return event;
> }
> public void setEvent(Event event) {
> this.event = event;
> }
> @Override
> public boolean equals(Object obj) {
> if (obj instanceof BusinessContinuityEventId) {
> BusinessContinuityEventId other = (BusinessContinuityEventId) obj;
>
> return this.event.getId().equals(other.event.getId())
> && this.id.equals(other.id);
> }
> return false;
> }
> @Override
> public int hashCode() {
> return this.event.getId().hashCode() ^ this.id.hashCode();
> }
> }
> private static final long serialVersionUID = 5385009048448590115L;
>
> @Id
> private Long id;
>
> @Id
> private Event event;
> @OneToMany(fetch = FetchType.LAZY, cascade = {CascadeType.PERSIST, CascadeType.REFRESH, CascadeType.MERGE})
> @Cascade(org.hibernate.annotations.CascadeType.SAVE_UPDATE)
> @JoinColumns({
> @JoinColumn(name = "BCE_ID", referencedColumnName = "BCE_ID"),
> @JoinColumn(name = "EVE_ID", referencedColumnName = "EVE_ID")})
> private List<Message> messages;
> public Long getId() {
> return id;
> }
> public void setId(Long id) {
> this.id = id;
> }
> public Event getEvent() {
> return event;
> }
> public void setEvent(Event event) {
> this.event = event;
> }
> public List<Message> getMessages() {
> return messages;
> }
> public void setMessages(List<Message> messages) {
> this.messages = messages;
> }
> }
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