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Nullpointer exception when binding a type (SortedMap)

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nickyjaspers

Post subject: Nullpointer exception when binding a type (SortedMap)

Posted: Tue Jun 19, 2007 3:38 am

Newbie

Joined: Tue Jun 19, 2007 2:44 am
Posts: 2

Hibernate version:
3.2.4.sp1

Mapping documents:
@CollectionOfElements
@JoinTable(name="user_play_history", schema="service_users_tracking",
joinColumns = @JoinColumn(name="user_id"))
@MapKey(columns = {@Column(name="time")})
@Column(name = "track_id")
@Type(type="integer")
@Sort(type=SortType.NATURAL)
private SortedMap<Date,Integer> trackHistory = new TreeMap<Date,Integer>();

Full stack trace of any exception that occurs:

java.lang.NullPointerException
at org.hibernate.cfg.annotations.MapBinder.bindKeyFromAssociationTable(MapBinder.java:129)
at org.hibernate.cfg.annotations.MapBinder.access$000(MapBinder.java:53)
at org.hibernate.cfg.annotations.MapBinder$1.secondPass(MapBinder.java:83)
at org.hibernate.cfg.CollectionSecondPass.doSecondPass(CollectionSecondPass.java:43)
at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1130)
at org.hibernate.cfg.AnnotationConfiguration.secondPassCompile(AnnotationConfiguration.java:316)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1286)
at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:915)
at com.philips.xstream.database.entity.user.impl.TestUserDao.setUp(TestUserDao.java:30)
at junit.framework.TestCase.runBare(TestCase.java:125)
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)

Name and version of the database you are using:
Mysql 5.0.27

The generated SQL (show_sql=true):
09:33:33,500 DEBUG CollectionSecondPass:57 - Mapped collection key: user_event_id, index: map_key, element: map_value
09:33:33,500 DEBUG CollectionSecondPass:41 - Second pass for collection: user.impl.UserImpl.trackHistory
09:33:33,500 DEBUG CollectionBinder:1026 - Binding a collection of element: user.impl.UserImpl.trackHistory
09:33:33,500 DEBUG SimpleValueBinder:220 - building SimpleValue for null

Debug level Hibernate log excerpt:

I need some help with this please.

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publicvoid

Post subject:

Posted: Fri Mar 07, 2008 9:16 am

Newbie

Joined: Fri Mar 07, 2008 8:56 am
Posts: 1

hibernate: 3.2.5.ga
hibernate-annotations: 3.3.0.ga

I'm having exactly the same issue.

Browsing a bit the source code, i realized that the NullPointerException is being raised beacause the following method returns null in org.hibernate.annotations.common.reflection.java.JavaXCollectionType:

Code:

public XClass getMapKey() {
   return new TypeSwitch<XClass>() {
      @Override
      public XClass caseParameterizedType(ParameterizedType parameterizedType) {
         if ( getCollectionClass().isAssignableFrom( Map.class ) ) {
            return toXClass( parameterizedType.getActualTypeArguments()[0] );
         }
         return null;
      }
   }.doSwitch( approximate() );
}

More specifically, the following expression seems misconstructed to me:

Code:

getCollectionClass().isAssignableFrom( Map.class )

The correct expression would be, imho:

Code:

Map.class.isAssignableFrom( getCollectionClass() )

I couldn't find any similar bug in Hibernate JIRA. Should I fire a bug for this?

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