[jboss-user] [Persistence, JBoss/CMP, Hibernate, Database] - NPE:OneToOneSecondPass.java:135 - Consecutive One to one rel

[virtual82]

Hi Guys, this is my environment:

java 1.6 
jboss-version: 4.0.5.GA
Seam-Version: 1.2.1.GA 
Hibernate-Version: 3.2.3.ga

I' m using annotation and javax.persistence.EntityManager.

the problem is in the mapping of the following schema (the relation are all one-to-one):
First <-(Fk to First)-Second <-(Fk to Second)-Third
.First has a pk generated by a sequence.
.Second and Third tables have pk=fk

this is my mapping:


=======================

public class EBFirst  implements java.io.Serializable {

private EBSecond eBSecond;

@GenericGenerator(name="generator", strategy="myGenerator.TriggerGenerator")
	@Id 
	@GeneratedValue(generator="generator")
	@Column(name="PK_ID", unique=true, nullable=false, columnDefinition="NUMBER", precision=28, scale=0)
	public BigDecimal getPkId() {
		return this.pkId;
	}

@OneToOne(mappedBy="EBFirst", cascade=CascadeType.ALL)
	public EBSecond getEBSecond() {
		return eBSecond;
	}
.
.
.

}

------------

public class EBSecond  implements java.io.Serializable {

private EBFirst EBFirst;
private EBThird eBThird;

    @GenericGenerator(name="generator", strategy="foreign", parameters = {@Parameter(name = "property", value = "EBFirst")})
	@GeneratedValue(generator="generator")
	@Id 
    @Column(name="PK_ID", unique=true, nullable=false, columnDefinition="NUMBER", precision=28, scale=0)
    public BigDecimal getPkId() {
        return this.pkId;
    }

    @OneToOne
	@PrimaryKeyJoinColumn
	public EBFirst getEBFirst() {
        return this.EBFirst;
    }


    @OneToOne (mappedBy="EBSecond", cascade=CascadeType.ALL)
	public EBThird getEBThird() {
		return eBThird;
	}

.
.
.

}

-------------


public class EBThird  implements java.io.Serializable {

	@GenericGenerator(name="generator", strategy="foreign", parameters = {@Parameter(name = "property", value = "EBSecond")})
	@GeneratedValue(generator="generator")
	@Id 
	@Column(name="PK_ID", unique=true, nullable=false, columnDefinition="NUMBER", precision=28, scale=0)
    public BigDecimal getPkId() {
        return this.pkId;
    }

    @OneToOne
	@PrimaryKeyJoinColumn
    public EBSecond getEBSecond() {
        return this.EBSecond;
    }
    

.
.
.

}

=======================




this is the exception at startup:

[org.jboss.system.ServiceController] Problem starting service persistence.units:ear=cerssvd.ear,jar=cerssvd.ejb3.jar,unitName=entityManager
java.lang.NullPointerException
	at org.hibernate.cfg.OneToOneSecondPass.doSecondPass(OneToOneSecondPass.java:135)
	at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1054)
	at org.hibernate.cfg.AnnotationConfiguration.secondPassCompile(AnnotationConfiguration.java:296)
	at org.hibernate.cfg.Configuration.buildMappings(Configuration.java:1039)
	at org.hibernate.ejb.Ejb3Configuration.buildMappings(Ejb3Configuration.java:1211)
	at org.hibernate.ejb.EventListenerConfigurator.configure(EventListenerConfigurator.java:154)
	at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:847)
	at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:385)
	at org.hibernate.ejb.HibernatePersistence.createContainerEntityManagerFactory(HibernatePersistence.java:126)
	at org.jboss.ejb3.entity.PersistenceUnitDeployment.start(PersistenceUnitDeployment.java:264)
	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)
.
.
.



the problem is in the class EBSecond at the following:
@OneToOne (mappedBy="EBSecond", cascade=CascadeType.ALL)

he doesn't like the attribute mappedBy="EBSecond". But it's mandatory (in this context)



Can someone help me?
Thanks, Gianpaolo

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