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parmendratyagi
 Post subject: OneToMany in Composite PK Entity causes PropertyAccessExcept
PostPosted: Sat Oct 18, 2008 8:40 am 
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Regular

Joined: Thu Sep 06, 2007 2:22 am
Posts: 108
Location: Noida,India
I am using Hibernate Core-3.2.4sp1 and Hibernate Annotation - 3.2.0 GA.

I need to create @OneToMany join between two tables using join on two non-directly related columns.

I've tried to simplify this code to illustrate the objective.


Code:
@Embeddable
public class StudentPK implements Serializable {

   private String studentName;

   private String fatherName;

   @Override
   public int hashCode() {
      String str = "" + this.studentName.hashCode()
            + this.fatherName.hashCode();
      return Integer.parseInt(str);
   }

   @Override
   public boolean equals(Object obj) {
      if (obj == null || !(obj instanceof StudentPK)) {
         return false;
      } else {
         StudentPK studentPK = (StudentPK) obj;

         return this.studentName.equals(studentPK.studentName)
               && this.fatherName.equals(studentPK.fatherName);
      }
   }

   public String getStudentName() {
      return studentName;
   }

   public void setStudentName(String studentName) {
      this.studentName = studentName;
   }

   public String getFatherName() {
      return fatherName;
   }

   public void setFatherName(String fatherName) {
      this.fatherName = fatherName;
   }

}

@Entity
@Table(name = "STUDENT")
public class Student implements Serializable{
   @Id
   @AttributeOverrides( {
         @AttributeOverride(name = "studentName", column = @Column(name = "STUDENT_NAME")),
         @AttributeOverride(name = "fatherName", column = @Column(name = "FATHER_NAME")) })
   private StudentPK studentPK;

   @Column(name = "CLASS_ID")
   private int classId;

   @OneToMany(fetch = FetchType.EAGER)
   @JoinColumn(name = "CLASS_ID", referencedColumnName = "CLASS_ID")
   Set<TimeTable> timeTable;

   public StudentPK getStudentPK() {
      return studentPK;
   }

   public void setStudentPK(StudentPK studentPK) {
      this.studentPK = studentPK;
   }

   public int getClassId() {
      return classId;
   }

   public void setClassId(int classId) {
      this.classId = classId;
   }

   public Set<TimeTable> getTimeTable() {
      return timeTable;
   }

   public void setTimeTable(Set<TimeTable> timeTable) {
      this.timeTable = timeTable;
   }

}

@Entity
@Table(name="TIME_TABLE")
public class TimeTable {
   
   @Id
   @Column(name="TIME_TABLE_ID")
   private int timeTableId;
   
   @Column(name="CLASS_ID")
   private int classId;

   public int getTimeTableId() {
      return timeTableId;
   }

   public void setTimeTableId(int timeTableId) {
      this.timeTableId = timeTableId;
   }

   public int getClassId() {
      return classId;
   }

   public void setClassId(int classId) {
      this.classId = classId;
   }
}


When i tried to execute simple HQL query " FROM Student ", it throw the following error -


Code:
org.hibernate.PropertyAccessException: could not get a field value by reflection getter of StudentPK.studentName
   at org.hibernate.property.DirectPropertyAccessor$DirectGetter.get(DirectPropertyAccessor.java:35)
   at org.hibernate.tuple.component.AbstractComponentTuplizer.getPropertyValue(AbstractComponentTuplizer.java:64)
   at org.hibernate.tuple.component.AbstractComponentTuplizer.getPropertyValues(AbstractComponentTuplizer.java:70)
   at org.hibernate.tuple.component.PojoComponentTuplizer.getPropertyValues(PojoComponentTuplizer.java:83)
   at org.hibernate.type.ComponentType.getPropertyValues(ComponentType.java:353)
   at org.hibernate.type.ComponentType.getHashCode(ComponentType.java:184)
   at org.hibernate.engine.EntityKey.generateHashCode(EntityKey.java:104)
   at org.hibernate.engine.EntityKey.<init>(EntityKey.java:48)
   at org.hibernate.engine.StatefulPersistenceContext.getCollectionOwner(StatefulPersistenceContext.java:675)
   at org.hibernate.loader.Loader.readCollectionElement(Loader.java:993)
   at org.hibernate.loader.Loader.readCollectionElements(Loader.java:646)
   at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:591)
   at org.hibernate.loader.Loader.doQuery(Loader.java:701)
   at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:236)
   at org.hibernate.loader.Loader.loadCollection(Loader.java:1994)
   at org.hibernate.loader.collection.CollectionLoader.initialize(CollectionLoader.java:36)
   at org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:565)
   at org.hibernate.event.def.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:60)
   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:794)
   at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:241)
   at org.hibernate.loader.Loader.doList(Loader.java:2220)
   at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2104)
   at org.hibernate.loader.Loader.list(Loader.java:2099)
   at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:378)
   at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:338)
   at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:172)
   at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1121)
   at org.hibernate.impl.QueryImpl.list(QueryImpl.java:79)
   at com.gehciits.cpn.dps.DummyTest.testing(DummyTest.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:585)
   at junit.framework.TestCase.runTest(TestCase.java:154)
   at junit.framework.TestCase.runBare(TestCase.java:127)
   at com.gehciits.cpn.dps.CpnJavaTestCase.runBare(CpnJavaTestCase.java:29)
   at junit.framework.TestResult$1.protect(TestResult.java:106)
   at junit.framework.TestResult.runProtected(TestResult.java:124)
   at junit.framework.TestResult.run(TestResult.java:109)
   at junit.framework.TestCase.run(TestCase.java:118)
   at junit.framework.TestSuite.runTest(TestSuite.java:208)
   at junit.framework.TestSuite.run(TestSuite.java:203)
   at org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:130)
   at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
   at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
   at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
   at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
   at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)
Caused by: java.lang.IllegalArgumentException
   at sun.reflect.UnsafeFieldAccessorImpl.ensureObj(UnsafeFieldAccessorImpl.java:37)
   at sun.reflect.UnsafeObjectFieldAccessorImpl.get(UnsafeObjectFieldAccessorImpl.java:18)
   at java.lang.reflect.Field.get(Field.java:357)
   at org.hibernate.property.DirectPropertyAccessor$DirectGetter.get(DirectPropertyAccessor.java:32)
   ... 49 more


I executed same query after changing Hibernate Annotation to 3.3.1 GA ( but without changing Hibernate Core version. Error remains persist, only error message get change. Now Error message become -

Code:
org.hibernate.PropertyAccessException: could not get a field value by reflection getter of StudentPK.fatherName
   at org.hibernate.property.DirectPropertyAccessor$DirectGetter.get(DirectPropertyAccessor.java:35)
   at org.hibernate.tuple.component.AbstractComponentTuplizer.getPropertyValue(AbstractComponentTuplizer.java:64)
   at org.hibernate.tuple.component.AbstractComponentTuplizer.getPropertyValues(AbstractComponentTuplizer.java:70)
   at org.hibernate.tuple.component.PojoComponentTuplizer.getPropertyValues(PojoComponentTuplizer.java:83)
   at org.hibernate.type.ComponentType.getPropertyValues(ComponentType.java:353)
   at org.hibernate.type.ComponentType.getHashCode(ComponentType.java:184)
   at org.hibernate.engine.EntityKey.generateHashCode(EntityKey.java:104)
   at org.hibernate.engine.EntityKey.<init>(EntityKey.java:48)
   at org.hibernate.engine.StatefulPersistenceContext.getCollectionOwner(StatefulPersistenceContext.java:675)
   at org.hibernate.loader.Loader.readCollectionElement(Loader.java:993)
   at org.hibernate.loader.Loader.readCollectionElements(Loader.java:646)
   at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:591)
   at org.hibernate.loader.Loader.doQuery(Loader.java:701)
   at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:236)
   at org.hibernate.loader.Loader.loadCollection(Loader.java:1994)
   at org.hibernate.loader.collection.CollectionLoader.initialize(CollectionLoader.java:36)
   at org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:565)
   at org.hibernate.event.def.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:60)
   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:794)
   at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:241)
   at org.hibernate.loader.Loader.doList(Loader.java:2220)
   at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2104)
   at org.hibernate.loader.Loader.list(Loader.java:2099)
   at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:378)
   at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:338)
   at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:172)
   at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1121)
   at org.hibernate.impl.QueryImpl.list(QueryImpl.java:79)
   at com.gehciits.cpn.dps.DummyTest.testing(DummyTest.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:585)
   at junit.framework.TestCase.runTest(TestCase.java:154)
   at junit.framework.TestCase.runBare(TestCase.java:127)
   at com.gehciits.cpn.dps.CpnJavaTestCase.runBare(CpnJavaTestCase.java:29)
   at junit.framework.TestResult$1.protect(TestResult.java:106)
   at junit.framework.TestResult.runProtected(TestResult.java:124)
   at junit.framework.TestResult.run(TestResult.java:109)
   at junit.framework.TestCase.run(TestCase.java:118)
   at junit.framework.TestSuite.runTest(TestSuite.java:208)
   at junit.framework.TestSuite.run(TestSuite.java:203)
   at org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:130)
   at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
   at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
   at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
   at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
   at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)
Caused by: java.lang.IllegalArgumentException
   at sun.reflect.UnsafeFieldAccessorImpl.ensureObj(UnsafeFieldAccessorImpl.java:37)
   at sun.reflect.UnsafeObjectFieldAccessorImpl.get(UnsafeObjectFieldAccessorImpl.java:18)
   at java.lang.reflect.Field.get(Field.java:357)
   at org.hibernate.property.DirectPropertyAccessor$DirectGetter.get(DirectPropertyAccessor.java:32)
   ... 49 more



Two interesting finding from my side. This error doesn't occur if any one of following condition happen-

1. Table "TIME_TABLE" (mapped to entity TimeTable) doesn't have any data.

2.if i remove "timeTable" associationd from entity Student.
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