I'm getting the NPE shown below when performing a session.get(Port.class, portID). It seems that despite the fact that the NE persister
declares the entity as being lazy and therefore AbstractTuplizer not
creating a proxyFactory for it, when loading an instance of Port which
has a reference to an NE, the getProxyFactory() method is called in
order to create a proxy, and failing
Hibernate version: 3.03
Fragment of Mapping documents:
Code:
<class name="Port" table="PORT" discriminator-value="PO">
<!--- properties --->
<many-to-one name="project" class="Project"lazy="true" column="PROJECT_ID"/>
<many-to-one name="ne" class="NE" column="NE_ID" index="I_PORT_NE" />
</class>
<class name="NE" table="NE" abstract="true">
... other properties ...
<set name="ports"
inverse="true"
cascade="save-update">
<key column="NE_ID"/>
<one-to-many class="Port"/>
</set>
</class>
Code between sessionFactory.openSession() and session.close(): getSessionFactory().openSession();
getSession().beginTransaction();
getSession().saveOrUpdate(ne);
getSession().saveOrUpdate(nePort);
getSession().flush();
neID = getSession().getIdentifier(ne);
nePortID = getSession().getIdentifier(nePort);
getSession().commitTransaction();
getSession().clear();
getSession().disconnect();
getSessionFactory().openSession();
getSession().beginTransaction();
port = getSession().get( Port.class, nePortID));
// exception thrown here ^
[/code]
Full stack trace of any exception that occurs:
java.lang.NullPointerException
at org.hibernate.tuple.AbstractTuplizer.createProxy(AbstractTuplizer.java:249)
at org.hibernate.persister.entity.BasicEntityPersister.createProxy(BasicEntityPersister.java:2813)
at org.hibernate.event.def.DefaultLoadEventListener.createProxyIfNecessary(DefaultLoadEventListener.java:218)
at org.hibernate.event.def.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:163)
at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:79)
at org.hibernate.impl.SessionImpl.internalLoad(SessionImpl.java:655)
at org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:261)
at org.hibernate.type.EntityType.resolve(EntityType.java:286)
at org.hibernate.engine.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:105)
at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:510)
at org.hibernate.loader.Loader.doQuery(Loader.java:420)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:211)
at org.hibernate.loader.Loader.loadEntity(Loader.java:1312)
at org.hibernate.loader.entity.EntityLoader.load(EntityLoader.java:116)
at org.hibernate.loader.entity.EntityLoader.load(EntityLoader.java:101)
at org.hibernate.persister.entity.BasicEntityPersister.load(BasicEntityPersister.java:2461)
at org.hibernate.event.def.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:350)
at org.hibernate.event.def.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:331)
at org.hibernate.event.def.DefaultLoadEventListener.load(DefaultLoadEventListener.java:113)
at org.hibernate.event.def.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:167)
at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:79)
at org.hibernate.impl.SessionImpl.get(SessionImpl.java:621)
at org.hibernate.impl.SessionImpl.get(SessionImpl.java:614)
at au.com.siemens.ecs.spct.command.CreateTrailCommandTest.step1_execCommand(CreateTrailCommandTest.java:109)
at au.com.siemens.ecs.spct.command.CreateTrailCommandTest.testCreateTrailUsingCommand(CreateTrailCommandTest.java:64)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at com.intellij.rt.execution.junit2.JUnitStarter.main(JUnitStarter.java:31)
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