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hibernate 3:

<hibernate-mapping package="poles">
<class name="Question" table="Questions">
<id column="questionNo" name="questionId" type="integer">
<generator class="identity"/>
</id>
<property name="questionText" column="question"/>
<set name="answers" cascade="all">
<key foreign-key="questionNo" column="questionNo"/>
<one-to-many class="Answer"/>
</set>
</class>
</hibernate-mapping>


<hibernate-mapping package="poles">
<class name="Answer" table="answers">

<id column="answerNo" name="answerId" type="integer">
<generator class="identity"/>
</id>

<property name="answerText" column="answer"/>
</class>
</hibernate-mapping>


Session s=c.buildSessionFactory().openSession();
Question q= new Question();
q.setQuestionText("win?");
Set l =new HashSet();
Answer a= new Answer();
a.setAnswerText("NO");
l.add(a);
q.setAnswers(l);
s.saveOrUpdate(q);
s.connection().commit();
s.close();[

is it becouse hibernate wouldn't update the questionNo in the answer Table?

org.hibernate.exception.ConstraintViolationException: could not insert: [poles.Answer]
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:71)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:1986)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2405)
at org.hibernate.action.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:37)
at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:248)
at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:269)
at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:167)
at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:101)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:186)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:175)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:98)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:70)
at org.hibernate.impl.SessionImpl.fireSaveOrUpdate(SessionImpl.java:502)
at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:494)
at org.hibernate.engine.CascadingAction$1.cascade(CascadingAction.java:134)
at org.hibernate.engine.Cascade.cascadeToOne(Cascade.java:213)
at org.hibernate.engine.Cascade.cascadeAssociation(Cascade.java:157)
at org.hibernate.engine.Cascade.cascadeProperty(Cascade.java:108)
at org.hibernate.engine.Cascade.cascadeCollectionElements(Cascade.java:290)
at org.hibernate.engine.Cascade.cascadeCollection(Cascade.java:185)
at org.hibernate.engine.Cascade.cascadeAssociation(Cascade.java:160)
at org.hibernate.engine.Cascade.cascadeProperty(Cascade.java:108)
at org.hibernate.engine.Cascade.cascade(Cascade.java:248)
at org.hibernate.event.def.AbstractSaveEventListener.cascadeAfterSave(AbstractSaveEventListener.java:410)
at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:299)
at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:167)
at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:101)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:186)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:175)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:98)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:70)
at org.hibernate.impl.SessionImpl.fireSaveOrUpdate(SessionImpl.java:502)
at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:494)
at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:490)
at tests.TestPoleHibernate.testPole(TestPoleHibernate.java:30)
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:324)
at junit.framework.TestCase.runTest(TestCase.java:154)
at junit.framework.TestCase.runBare(TestCase.java:127)
at junit.framework.TestResult$1.protect(TestResult.java:106)
at junit.framework.TestResult.runProtected(TestResult.java:124)
at junit.framework.TestResult.run(TestResult.java:109)
at junit.framework.TestCase.run(TestCase.java:118)
at junit.framework.TestSuite.runTest(TestSuite.java:208)
at junit.framework.TestSuite.run(TestSuite.java:203)
at org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:128)
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)
Caused by: java.sql.SQLException: Cannot add or update a child row: a foreign key constraint fails
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2851)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1531)
at com.mysql.jdbc.ServerPreparedStatement.serverExecute(ServerPreparedStatement.java:1366)
at com.mysql.jdbc.ServerPreparedStatement.executeInternal(ServerPreparedStatement.java:952)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1974)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1897)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1758)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:1968)
... 51 more


mysql 4.1 :

Hibernate: insert into poles.Questions (question) values (?)
Hibernate: insert into poles.answers (answer) values (?)


Debug level Hibernate log excerpt:

2006-10-06 16:22:34,927 WARN [net.sf.ehcache.config.Configurator] - <No configuration found. Configuring ehcache from ehcache-failsafe.xml found in the classpath: jar:file:/C:/eclipse/workspace/poles/lib/ehcache-1.1.jar!/ehcache-failsafe.xml>
2006-10-06 16:22:35,287 INFO [org.hibernate.impl.SessionFactoryObjectFactory] - <Not binding factory to JNDI, no JNDI name configured>
2006-10-06 16:22:35,407 WARN [org.hibernate.util.JDBCExceptionReporter] - <SQL Error: 1216, SQLState: 23000>
2006-10-06 16:22:35,407 ERROR [org.hibernate.util.JDBCExceptionReporter] - <Cannot add or update a child row: a foreign key constraint fails>


Problems with Session and transaction handling? no