[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-3232) Null Pointer Exception on Sort in a set

Null Pointer Exception on Sort in a set --------------------------------------- Key: HHH-3232 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3232 Project: Hibernate3 Issue Type: Bug Affects Versions: 3.0 final Environment: Windows Apache mySQL Tomcat Reporter: FOIRET Priority: Critical Attachments: test.sql, TEST.zip Hi, Find below a null pointer exception error when i try to find the ElemactionDAO by his ID (vdo.epi.hibernate.ElemactionDAO.findById) This error appears when i add a sort="natural" in the set of the entity (Action). An Action contains a set of Elemaction (Find after a part of the mapping file Action) This parameter resolves my sort issue in the set but it creates this one ... I use a TreeSet in the POJO Action for the Elemaction Could you tell me what is the issue ? java.lang.NullPointerException at java.lang.String.compareTo(Unknown Source) at vdo.epi.hibernate.Elemaction.compareTo(Elemaction.java:491) at java.util.TreeMap.compare(Unknown Source) at java.util.TreeMap.put(Unknown Source) at java.util.TreeSet.add(Unknown Source) at org.hibernate.collection.PersistentSet.initializeFromCache(PersistentSet.java:104) at org.hibernate.cache.entry.CollectionCacheEntry.assemble(CollectionCacheEntry.java:35) at org.hibernate.event.def.DefaultInitializeCollectionEventListener.initializeCollectionFromCache(DefaultInitializeCollectionEventListener.java:130) at org.hibernate.event.def.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:48) at org.hibernate.impl.SessionImpl.initializeCollection(SessionImpl.java:1716) at org.hibernate.collection.AbstractPersistentCollection.forceInitialization(AbstractPersistentCollection.java:454) at org.hibernate.engine.StatefulPersistenceContext.initializeNonLazyCollections(StatefulPersistenceContext.java:755) at org.hibernate.event.def.DefaultLoadEventListener.assembleCacheEntry(DefaultLoadEventListener.java:567) at org.hibernate.event.def.DefaultLoadEventListener.loadFromSecondLevelCache(DefaultLoadEventListener.java:494) at org.hibernate.event.def.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:356) at org.hibernate.event.def.DefaultLoadEventListener.load(DefaultLoadEventListener.java:137) at org.hibernate.event.def.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:193) at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:101) at org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java:878) at org.hibernate.impl.SessionImpl.internalLoad(SessionImpl.java:846) at org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:266) at org.hibernate.type.ManyToOneType.assemble(ManyToOneType.java:196) at org.hibernate.type.TypeFactory.assemble(TypeFactory.java:404) at org.hibernate.cache.entry.CacheEntry.assemble(CacheEntry.java:96) at org.hibernate.cache.entry.CacheEntry.assemble(CacheEntry.java:82) at org.hibernate.event.def.DefaultLoadEventListener.assembleCacheEntry(DefaultLoadEventListener.java:540) at org.hibernate.event.def.DefaultLoadEventListener.loadFromSecondLevelCache(DefaultLoadEventListener.java:494) at org.hibernate.event.def.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:356) at org.hibernate.event.def.DefaultLoadEventListener.load(DefaultLoadEventListener.java:137) at org.hibernate.event.def.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:193) at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:101) at org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java:878) at org.hibernate.impl.SessionImpl.get(SessionImpl.java:815) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.hibernate.context.ThreadLocalSessionContext$TransactionProtectionWrapper.invoke(ThreadLocalSessionContext.java:301) at $Proxy3.get(Unknown Source) at vdo.epi.hibernate.ElemactionDAO.findById(ElemactionDAO.java:159) at vdo.epi.page.ActioncreaPage.onEditElem(ActioncreaPage.java:424) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at net.sf.click.util.ClickUtils.invokeListener(ClickUtils.java:1393) at net.sf.click.control.ActionLink.onProcess(ActionLink.java:498) at net.sf.click.ClickServlet.processPage(ClickServlet.java:555) at net.sf.click.ClickServlet.handleRequest(ClickServlet.java:356) at net.sf.click.ClickServlet.doGet(ClickServlet.java:284) at javax.servlet.http.HttpServlet.service(HttpServlet.java:690) at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:174) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:151) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:874) at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528) at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689) at java.lang.Thread.run(Unknown Source) Lines in the Mapping file of Action which defines the set of Elemaction <set name="elemaction" inverse="true" cascade="all" lazy="false" sort="natural"> <cache usage="read-write" /> <key column="actionId" /> <one-to-many class="Elemaction" /> </set>