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Patrali
 Post subject: object is not an instance of declaring class
PostPosted: Fri Dec 09, 2016 6:22 pm 
Newbie

Joined: Fri Dec 09, 2016 6:11 pm
Posts: 2
I am using hibernate to handle database transactions. I am new in hibernate.

I have to entities :

- AttributeEntity
- TaxonomyEntity

AttributeEntity can have one or more taxonomyEntities.

AttributeEntity constraints:

- attributeId is the primary key
- attributeCd is unique

TaxonomyEntity constraints:

- taxonomyId is the primary key
- attributeCd is the foreign key to the table "Attribute"

What am I trying to do?

Create the relationships between these two entities so that if I can create/delete the whole tree structure ( Attribue and it's taxonomies). Like attributeEntity.save() or attributeEntity.delete()

The problem:

Using the test below, when I am trying to save the attributeEntity,hibernate saves the data. But when using a list of taxonomyEntity as part of AttributeEntity, I am seeing the error described below. **May I get any insight on the reason of the error?**



My AttributeEntity class:

Code:
   package com.myplace.online.attribute.api.entities;

   import java.io.Serializable;
   import java.sql.Time;
   import java.util.ArrayList;
   import java.util.Collection;
   import java.util.List;

   import javax.persistence.*;


   @Entity
   @SequenceGenerator( name = "attribute_seq", sequenceName = "OAP_META_NEW.ATTRIBUTE_SEQ" )
   @Table(name = "ATTRIBUTE", schema = "OAP_META_NEW")
   public class AttributeEntity implements Serializable
   {
      private int attributeId;
      private Integer attributeCategoryId;
      private String attributeName;
      private String attributeCd;

      private List<TaxonomyEntity> taxonomyEntities;


      @Id
      @Column(name = "ATTRIBUTE_ID", nullable = false, unique = true)
      @GeneratedValue( strategy = GenerationType.AUTO, generator = "attribute_seq" )
      public int getAttributeId()
      {
         return attributeId;
      }

      public void setAttributeId( int attributeId )
      {
         this.attributeId = attributeId;
      }

      @Basic
      @Column(name = "ATTRIBUTE_CATEGORY_ID", nullable = false, precision = 0)
      @JoinColumn(name = "ATTRIBUTE_CATEGORY_ID", referencedColumnName = "ATTRIBUTE_CATEGORY_ID")
      public Integer getAttributeCategoryId()
      {
         return attributeCategoryId;
      }

      public void setAttributeCategoryId( Integer attributeCategoryId )
      {
         this.attributeCategoryId = attributeCategoryId;
      }

      @Basic
      @Column(name = "ATTRIBUTE_NAME", nullable = false, length = 70)
      public String getAttributeName()
      {
         return attributeName;
      }

      public void setAttributeName( String attributeName )
      {
         this.attributeName = attributeName;
      }

      
      [b]@Basic
      @Column(name = "ATTRIBUTE_CD", nullable = false, length = 6)
      public String getAttributeCd()
      {
         return attributeCd;
      }

      public void setAttributeCd( String attributeCd )
      {
         this.attributeCd = attributeCd;
      }[/b]

      

   
      [b]@OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, orphanRemoval = true)
      @JoinColumn( name = "ATTRIBUTE_CD", referencedColumnName = "ATTRIBUTE_CD", nullable = false )
      public List<TaxonomyEntity> getTaxonomyEntities()
      {
         return taxonomyEntities;
      }

      public void setTaxonomyEntities(List<TaxonomyEntity> taxonomyEntities)
      {
         this.taxonomyEntities = taxonomyEntities;
      }[/b]


   }



My TaxonomyEntity class

Code:
package com.myplace.online.attribute.api.entities;

   import java.io.Serializable;
   import java.util.List;

   import javax.persistence.*;


   @Entity
   @SequenceGenerator( name = "taxonomy_seq", sequenceName = "OAP_META_NEW.TAXONOMY_SEQ" )
   @Table(name = "TAXONOMY", schema = "OAP_META_NEW")
   public class TaxonomyEntity implements Serializable
   {
      private int taxonomyId;
      private String attributeCd;
      private String taxonomyCategory;
      private String taxonomySubcategory;
      private String taxonomyAttributeName;


      @Id
      @Column(name = "TAXONOMY_ID", nullable = false, unique = true)
      @GeneratedValue( strategy = GenerationType.AUTO, generator = "taxonomy_seq" )
      public int getTaxonomyId()
      {
         return taxonomyId;
      }

      public void setTaxonomyId( int taxonomyId )
      {
         this.taxonomyId = taxonomyId;
      }

      [b]@Basic
      @Column(name = "ATTRIBUTE_CD", length = 6,  nullable = false, insertable = false ,updatable = false)
      public String getAttributeCd()
      {
         return attributeCd;
      }

      public void setAttributeCd( String attributeCd )
      {
         this.attributeCd = attributeCd;
      }[/b]

      @Basic
      @Column(name = "TAXONOMY_CATEGORY", nullable = true, length = 100)
      public String getTaxonomyCategory()
      {
         return taxonomyCategory;
      }

      public void setTaxonomyCategory( String taxonomyCategory )
      {
         this.taxonomyCategory = taxonomyCategory;
      }

      @Basic
      @Column(name = "TAXONOMY_SUBCATEGORY", nullable = true, length = 100)
      public String getTaxonomySubcategory()
      {
         return taxonomySubcategory;
      }

      public void setTaxonomySubcategory( String taxonomySubcategory )
      {
         this.taxonomySubcategory = taxonomySubcategory;
      }

      @Basic
      @Column(name = "TAXONOMY_ATTRIBUTE_NAME", nullable = false, length = 100)
      public String getTaxonomyAttributeName()
      {
         return taxonomyAttributeName;
      }

      public void setTaxonomyAttributeName( String taxonomyAttributeName )
      {
         this.taxonomyAttributeName = taxonomyAttributeName;
      }

      
   }


This is the way I am trying to test:

Code:
      //create attribute
        attributeEntity = new AttributeEntity();
        attributeEntity.setAttributeCategoryId(0);
        attributeEntity.setAttributeCd("E_TEST");
        attributeEntity.setAttributeId(0);
        attributeEntity.setAttributeName("TEST_ATTRIBUTE");

        //Create Taxomony
        taxonomyEntity = new TaxonomyEntity();
       // taxonomyEntity.setTaxonomyId(0); -- expecting this to be created by the sequence
        taxonomyEntity.setDescription("A test taxonomy");
        taxonomyEntity.setTaxonomyCategory("123123123CategoryTest");
        taxonomyEntity.setTaxonomySubcategory("123123123SubcategoryTest");
       // taxonomyEntity.setAttributeCd(attributeEntity.getAttributeCd()); -- Expecting this to be created from AttributeEntity
        taxonomyEntity.setTaxonomyAttributeName("TEST_TAXONOMY_ATTRIBUTE");


        List<TaxonomyEntity> taxonomyList = new ArrayList<TaxonomyEntity>();
        taxonomyList.add(taxonomyEntity);

        attributeEntity.setTaxonomyEntities(taxonomyList);

        attributeService = context.getBean( AttributeService.class );
        attributeService.saveAttributeEntity(attributeEntity);



This is the error I am seeing :

- IllegalArgumentException occurred calling getter of com.myplace.online.attribute.api.entities.AttributeEntity.attributeCd
- and then towards the end : Caused by: java.lang.IllegalArgumentException: object is not an instance of declaring class


org.hibernate.PropertyAccessException: IllegalArgumentException occurred calling getter of com.myplace.online.attribute.api.entities.AttributeEntity.attributeCd


Code:
   at org.hibernate.property.BasicPropertyAccessor$BasicGetter.get(BasicPropertyAccessor.java:192)
      at org.hibernate.tuple.component.AbstractComponentTuplizer.getPropertyValue(AbstractComponentTuplizer.java:76)
      at org.hibernate.tuple.component.AbstractComponentTuplizer.getPropertyValues(AbstractComponentTuplizer.java:82)
      at org.hibernate.tuple.component.PojoComponentTuplizer.getPropertyValues(PojoComponentTuplizer.java:107)
      at org.hibernate.type.ComponentType.getPropertyValues(ComponentType.java:433)
      at org.hibernate.type.ComponentType.getPropertyValues(ComponentType.java:421)
      at org.hibernate.event.internal.WrapVisitor.processComponent(WrapVisitor.java:135)
      at org.hibernate.event.internal.AbstractVisitor.processValue(AbstractVisitor.java:127)
      at org.hibernate.event.internal.WrapVisitor.processValue(WrapVisitor.java:125)
      at org.hibernate.event.internal.AbstractVisitor.processEntityPropertyValues(AbstractVisitor.java:76)
      at org.hibernate.event.internal.AbstractSaveEventListener.visitCollectionsBeforeSave(AbstractSaveEventListener.java:372)
      at org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:273)
      at org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:194)
      at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:137)
      at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:209)
      at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:194)
      at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:114)
      at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:90)
      at org.hibernate.internal.SessionImpl.fireSaveOrUpdate(SessionImpl.java:684)
      at org.hibernate.internal.SessionImpl.saveOrUpdate(SessionImpl.java:676)
      at org.hibernate.engine.spi.CascadingActions$5.cascade(CascadingActions.java:235)
      at org.hibernate.engine.internal.Cascade.cascadeToOne(Cascade.java:350)
      at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:293)
      at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:161)
      at org.hibernate.engine.internal.Cascade.cascadeCollectionElements(Cascade.java:379)
      at org.hibernate.engine.internal.Cascade.cascadeCollection(Cascade.java:319)
      at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:296)
      at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:161)
      at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:118)
      at org.hibernate.event.internal.AbstractSaveEventListener.cascadeAfterSave(AbstractSaveEventListener.java:460)
      at org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:294)
      at org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:194)
      at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:137)
      at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:209)
      at org.hibernate.event.internal.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:55)
      at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:194)
      at org.hibernate.event.internal.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:49)
      at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:90)
      at org.hibernate.internal.SessionImpl.fireSave(SessionImpl.java:715)
      at org.hibernate.internal.SessionImpl.save(SessionImpl.java:707)
      at org.hibernate.internal.SessionImpl.save(SessionImpl.java:702)
      at com.myplace.online.attribute.api.dao.GenericDAOImpl.save(GenericDAOImpl.java:85)
      at com.myplace.online.attribute.api.services.AttributeServiceImpl.saveAttributeEntity(AttributeServiceImpl.java:41)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      at java.lang.reflect.Method.invoke(Method.java:497)
      at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:302)
      at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)
      at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
      at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99)
      at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:281)
      at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
      at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
      at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:208)
      at com.sun.proxy.$Proxy39.saveAttributeEntity(Unknown Source)
      at com.myplace.online.attribute.api.TaxonomyTest.setUpEntity(TaxonomyTest.java:97)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      at java.lang.reflect.Method.invoke(Method.java:497)
      at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:80)
      at org.testng.internal.Invoker.invokeConfigurationMethod(Invoker.java:564)
      at org.testng.internal.Invoker.invokeConfigurations(Invoker.java:213)
      at org.testng.internal.Invoker.invokeConfigurations(Invoker.java:138)
      at org.testng.internal.TestMethodWorker.invokeBeforeClassMethods(TestMethodWorker.java:175)
      at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:107)
      at org.testng.TestRunner.privateRun(TestRunner.java:767)
      at org.testng.TestRunner.run(TestRunner.java:617)
      at org.testng.SuiteRunner.runTest(SuiteRunner.java:334)
      at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:329)
      at org.testng.SuiteRunner.privateRun(SuiteRunner.java:291)
      at org.testng.SuiteRunner.run(SuiteRunner.java:240)
      at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
      at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
      at org.testng.TestNG.runSuitesSequentially(TestNG.java:1198)
      at org.testng.TestNG.runSuitesLocally(TestNG.java:1123)
      at org.testng.TestNG.run(TestNG.java:1031)
      at org.testng.IDEARemoteTestNG.run(IDEARemoteTestNG.java:72)
      at org.testng.RemoteTestNGStarter.main(RemoteTestNGStarter.java:124)
      [b] Caused by: java.lang.IllegalArgumentException: object is not an instance of declaring class[/b]
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      at java.lang.reflect.Method.invoke(Method.java:497)
      at org.hibernate.property.BasicPropertyAccessor$BasicGetter.get(BasicPropertyAccessor.java:169)
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vlad
 Post subject: Re: object is not an instance of declaring class
PostPosted: Sun Dec 11, 2016 2:30 am 
Hibernate Team
Hibernate Team

Joined: Thu Sep 11, 2014 2:50 am
Posts: 1628
Location: Romania
In ToxonomyEntity, change attributeCd property as follows:

Code:
     
      @ManyToOne
      @JoinColumn(name = "ATTRIBUTE_CD", length = 6,  nullable = false)
      public AttributeEntity getAttributeEntity()
      {
         return attributeEntity;
      }


In AttributeEntity, you need to:

1. Remove the attributeCd property
2. Change the taxonomyEntities property to:

Code:
     
      @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, orphanRemoval = true, mappedBy="attributeEntity")
      public List<TaxonomyEntity> getTaxonomyEntities()
      {
         return taxonomyEntities;
      }


The data access logic becomes

Code:
    //create attribute
        attributeEntity = new AttributeEntity();
        attributeEntity.setAttributeCategoryId(0);
        attributeEntity.setAttributeId(0);
        attributeEntity.setAttributeName("TEST_ATTRIBUTE");

        //Create Taxomony
        taxonomyEntity = new TaxonomyEntity();
        taxonomyEntity.setDescription("A test taxonomy");
        taxonomyEntity.setTaxonomyCategory("123123123CategoryTest");
        taxonomyEntity.setTaxonomySubcategory("123123123SubcategoryTest");
        taxonomyEntity.setAttributeEntity(attributeEntity);
        taxonomyEntity.setTaxonomyAttributeName("TEST_TAXONOMY_ATTRIBUTE");


        List<TaxonomyEntity> taxonomyList = new ArrayList<TaxonomyEntity>();
        taxonomyList.add(taxonomyEntity);

        attributeEntity.setTaxonomyEntities(taxonomyList);

        attributeService = context.getBean( AttributeService.class );
        attributeService.saveAttributeEntity(attributeEntity);
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Patrali
 Post subject: Re: object is not an instance of declaring class
PostPosted: Mon Dec 12, 2016 11:11 am 
Newbie

Joined: Fri Dec 09, 2016 6:11 pm
Posts: 2
It worked . Thanks so much vlad
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vlad
 Post subject: Re: object is not an instance of declaring class
PostPosted: Mon Dec 12, 2016 11:30 am 
Hibernate Team
Hibernate Team

Joined: Thu Sep 11, 2014 2:50 am
Posts: 1628
Location: Romania
You're welcome.
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