Error with <many-to-one> mapping

[Nav een]

Hi,

I am getting the following error while trying to insert a record.

SEVERE: IllegalArgumentException in class: org.nav.tracker.hdto.TemplateDTO, getter method of property: tempID
org.hibernate.PropertyAccessException: IllegalArgumentException occurred calling getter of org.nav.tracker.hdto.TemplateDTO.tempID
at org.hibernate.property.BasicPropertyAccessor$BasicGetter.get(BasicPropertyAccessor.java:171)
at org.hibernate.tuple.entity.AbstractEntityTuplizer.getIdentifier(AbstractEntityTuplizer.java:183)
at org.hibernate.persister.entity.AbstractEntityPersister.getIdentifier(AbstractEntityPersister.java:3589)
at org.hibernate.persister.entity.AbstractEntityPersister.isTransient(AbstractEntityPersister.java:3305)
at org.hibernate.engine.ForeignKeys.isTransient(ForeignKeys.java:181)
at org.hibernate.engine.ForeignKeys$Nullifier.isNullifiable(ForeignKeys.java:137)
at org.hibernate.engine.ForeignKeys$Nullifier.nullifyTransientReferences(ForeignKeys.java:69)
at org.hibernate.engine.ForeignKeys$Nullifier.nullifyTransientReferences(ForeignKeys.java:47)
at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:288)
at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:181)
at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:121)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:187)
at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:33)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:172)
at org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:27)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:70)
at org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:535)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:523)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:519)
at test.Test.main(Test.java:66)
Caused by: java.lang.IllegalArgumentException: object is not an instance of declaring class
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 org.hibernate.property.BasicPropertyAccessor$BasicGetter.get(BasicPropertyAccessor.java:145)
... 19 more


MApping File :

 <!-- Template Master -->
  <class name="org.nav.tracker.hdto.TemplateDTO" table="TEMPLATE_MAS">
  	<id name="tempID" type="string" column="TEMP_ID">
  	</id>
  	<property name="templateName" type="string" column="TEMP_NAME"></property>
  	<property name="templateDesc" type="string" column="TEMP_DESC"></property>
  	<property name="active" type="string" column="ACTIVE"></property>
  	<property name="ctdTmsp" type="timestamp" column="CTD_TMSP" insert="false" update="false">
  		<meta attribute="default-value">CURRENT_TIMESTAMP</meta>
  	</property>
  	<property name="updTmsp" type="timestamp" column="UPD_TMSP">
  	</property>
  	
  </class>
  
  <!-- Template UI -->
  <class name="org.nav.tracker.hdto.TemplateUIDTO" table="TEMPLATE_UI">
  	<id name="fieldID" type="string" column="FIELD_ID">
  	</id>
  	<property name="fieldType" type="string" column="FIELD_TYPE"></property>
  	<property name="fieldLabel" type="string" column="FIELD_LABEL"></property>
  	<property name="active" type="string" column="ACTIVE"></property>
  	<property name="maxLength" type="integer" column="MAX_LENGTH"></property>
  	<property name="minlength" type="integer" column="MIN_LENGTH"></property>
  	<property name="ctdTmsp" type="timestamp" column="CTD_TMSP" insert="false" update="false">
  		<meta attribute="default-value">CURRENT_TIMESTAMP</meta>
  	</property>
  	<property name="updTmsp" type="timestamp" column="UPD_TMSP"></property>
  	
  	<many-to-one name="tempID" column="TEMP_ID" class="org.nav.tracker.hdto.TemplateDTO"/> 
  </class>

Code executed :

SessionFactory sf = new Configuration().configure().buildSessionFactory();
			Session session = sf.openSession();
			Transaction tx = session.beginTransaction();
			System.out.println("session opened");
			
			
			TemplateUIDTO uidto = new TemplateUIDTO();
			uidto.setFieldID("FL090611-000");
			uidto.setFieldLabel("Name");
			uidto.setFieldType("TEXT");
			uidto.setActive("A");
			uidto.setMaxLength(50);
			uidto.setMinlength(6);
			uidto.setTempID("TP190611-000");
			
			session.save(uidto);
			tx.commit();
			session.close();
			System.out.println("record saved");

[Rishi Shehrawat]

In the mapping you have

<many-to-one name="tempID" column="TEMP_ID" class="org.nav.tracker.hdto.TemplateDTO"/>

But in java code you are setting this as String, this I think is causing the problem.

[Nav een]

Rishi Shehrawat wrote:In the mapping you have

<many-to-one name="tempID" column="TEMP_ID" class="org.nav.tracker.hdto.TemplateDTO"/>

But in java code you are setting this as String, this I think is causing the problem.

Here, class is the pojo(model) class in which the foreign key is declared.

[prathamesh bandivadekar]

can you post your pojo class?

[Waswani Naresh]

Hi Naveen,

As Rishi mentioned, you should have TemplateDTO and not String tempID as a member of TemplateUIDTO class. Though you are trying to make that as foreign key, the way you are doing it is wrong.

Replace

private String tempID;    --> Hoping this is the way you have in your TemplateUIDTO 

with

private TemplateDTO tempID;

While saving TemplateUIDTO object, hibernate will take care of the foreign key (using the hbm file mapping). You need not worry on that front.

Regards,
Naresh Waswani