[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-3232) Null Pointer Exception on Sort in a set
Dmitry Geraskov (JIRA)
noreply at atlassian.com
Wed May 21 09:58:33 EDT 2008
[ http://opensource.atlassian.com/projects/hibernate/browse/HHH-3232?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_30228 ]
Dmitry Geraskov commented on HHH-3232:
--------------------------------------
Oh, sorry my previous comment is useless.
FOIRET,
See in your Elemaction#compareTo()
public int compareTo(Object o) {
if (!(o instanceof Elemaction)) return 0;
Elemaction el = (Elemaction)o;
int resultat = this.libelle.compareTo(el.getLibelle());
return resultat;
}
When el.getLibelle()==null you'll get your exception. Or you'll get other if this.libelle==null.
Change method to:
public int compareTo(Object o) {
if (!(o instanceof Elemaction)) return 0;
Elemaction el = (Elemaction)o;
if (this.libelle == null && el.getLibelle() == null) return 0;
if (this.libelle == null) return -1;
if (el.getLibelle() == null) return 1;
int resultat = this.libelle.compareTo(el.getLibelle());
return resultat;
}
The comparator think that null==null, null less than not null.
> 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: R.java, 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>
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