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From Himadri <hima_...@yahoo.co.in>
Subject Issue with ID column for Database view as Entity (EJB3.0)
Date Wed, 30 Jun 2010 05:00:37 GMT

Hi,

My requirement is to use a database view as EJB3.0 Entity. I suppose this
doesnt need any extra effort. table name tag is db view name instead of
table name. This is how it looks like 

@Entity
@Table(name="Property_V")
@NamedQueries({
@NamedQuery(name="findPropsByName" ,query="Select o from PropertyView o
where o.name = :a"),
})
public class PropertyView extends PropertyViewBean {}


I have only getter methods in Entity and no setters. The issue comes only
when I declare ID column in entity.
	@Column(name="ID")
	public String id ;
	public String getId() {
		return this.id; 
	}

Its varchar2 in oracle database but somehow openjpa interpret it as BIGINT
and throws me below ! This is coming when I try to call the namedquery. 

javax.ejb.EJBException: EJB Exception: ; nested exception is: 
	<openjpa-0.0.0-rnull fatal user error>
org.apache.openjpa.persistence.ArgumentException:
"com.sample.magic.poc.domain.PropertyViewBean.id" declares a column that is
not compatible with the expected type "varchar".  Column details:
Full Name: Property_V.id
Type: bigint
Size: 0
Default: null
Not Null: true

	at
weblogic.ejb.container.internal.RemoteBusinessIntfProxy.unwrapRemoteException(RemoteBusinessIntfProxy.java:105)
	at
weblogic.ejb.container.internal.RemoteBusinessIntfProxy.invoke(RemoteBusinessIntfProxy.java:87)
	at $Proxy0.getProperties(Unknown Source)
	at test.junit.TestSample.testView(TestSample.java:67)
	at test.junit.TestSample.main(TestSample.java:26)
Caused by: <openjpa-0.0.0-rnull fatal user error>
org.apache.openjpa.persistence.ArgumentException:
"com.tieto.magic.poc.domain.PropertyViewBean.id" declares a column that is
not compatible with the expected type "varchar".  Column details:
Full Name: Property_V.id
Type: bigint
Size: 0
Default: null
Not Null: true

	at
org.apache.openjpa.jdbc.meta.MappingInfo.mergeColumn(MappingInfo.java:659)
	at
org.apache.openjpa.jdbc.meta.MappingInfo.createColumns(MappingInfo.java:518)
	at
org.apache.openjpa.jdbc.meta.ValueMappingInfo.getColumns(ValueMappingInfo.java:143)
	at
org.apache.openjpa.jdbc.meta.strats.StringFieldStrategy.map(StringFieldStrategy.java:79)
	at
org.apache.openjpa.jdbc.meta.FieldMapping.setStrategy(FieldMapping.java:120)
	at
org.apache.openjpa.jdbc.meta.RuntimeStrategyInstaller.installStrategy(RuntimeStrategyInstaller.java:80)
	at
org.apache.openjpa.jdbc.meta.FieldMapping.resolveMapping(FieldMapping.java:438)
	at org.apache.openjpa.jdbc.meta.FieldMapping.resolve(FieldMapping.java:403)
	at
org.apache.openjpa.jdbc.meta.ClassMapping.resolveNonRelationMappings(ClassMapping.java:851)
	at
org.apache.openjpa.jdbc.meta.MappingRepository.prepareMapping(MappingRepository.java:324)
	at
org.apache.openjpa.meta.MetaDataRepository.preMapping(MetaDataRepository.java:662)
	at
org.apache.openjpa.meta.MetaDataRepository.resolve(MetaDataRepository.java:549)
	at
org.apache.openjpa.meta.MetaDataRepository.getMetaData(MetaDataRepository.java:308)
	at
org.apache.openjpa.meta.MetaDataRepository.getMetaData(MetaDataRepository.java:363)
	at org.apache.openjpa.kernel.QueryImpl.classForName(QueryImpl.java:1563)
	at
org.apache.openjpa.kernel.ExpressionStoreQuery$1.classForName(ExpressionStoreQuery.java:108)
	at
org.apache.openjpa.kernel.jpql.JPQLExpressionBuilder.getClassMetaData(JPQLExpressionBuilder.java:168)
	at
org.apache.openjpa.kernel.jpql.JPQLExpressionBuilder.resolveClassMetaData(JPQLExpressionBuilder.java:139)
	at
org.apache.openjpa.kernel.jpql.JPQLExpressionBuilder.getCandidateMetaData(JPQLExpressionBuilder.java:225)
	at
org.apache.openjpa.kernel.jpql.JPQLExpressionBuilder.getCandidateMetaData(JPQLExpressionBuilder.java:195)
	at
org.apache.openjpa.kernel.jpql.JPQLExpressionBuilder.getCandidateType(JPQLExpressionBuilder.java:188)
	at
org.apache.openjpa.kernel.jpql.JPQLExpressionBuilder.access$600(JPQLExpressionBuilder.java:69)
	at
org.apache.openjpa.kernel.jpql.JPQLExpressionBuilder$ParsedJPQL.populate(JPQLExpressionBuilder.java:1754)
	at org.apache.openjpa.kernel.jpql.JPQLParser.populate(JPQLParser.java:56)
	at
org.apache.openjpa.kernel.ExpressionStoreQuery.populateFromCompilation(ExpressionStoreQuery.java:153)
	at org.apache.openjpa.kernel.QueryImpl.newCompilation(QueryImpl.java:657)
	at
org.apache.openjpa.kernel.QueryImpl.compilationFromCache(QueryImpl.java:638)
	at
org.apache.openjpa.kernel.QueryImpl.compileForCompilation(QueryImpl.java:604)
	at
org.apache.openjpa.kernel.QueryImpl.compileForExecutor(QueryImpl.java:666)
	at org.apache.openjpa.kernel.QueryImpl.compile(QueryImpl.java:573)
	at kodo.kernel.KodoQuery.compile(KodoQuery.java:75)
	at
org.apache.openjpa.persistence.EntityManagerImpl.createNamedQuery(EntityManagerImpl.java:892)
	at
org.apache.openjpa.persistence.EntityManagerImpl.createNamedQuery(EntityManagerImpl.java:77)
	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:597)
	at
weblogic.deployment.BasePersistenceContextProxyImpl.invoke(BasePersistenceContextProxyImpl



My P.xml is a very simple one
  <persistence-unit name="pocDS" transaction-type="JTA">
    <jta-data-source>pocDS</jta-data-source>
    <properties>
    <property name="openjpa.jdbc.DBDictionary"
value="oracle(UseGetBytesForBlobs=true)"/>
    
    </properties>    
  </persistence-unit>
</persistence>


This works fine with actual table in database . Only view has this problem.
Is there any specific configuration required when working with view ?

Thanks in advance,

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