Description Karsten Wutzke 2010-11-29 20:09:39 EST

I have three tables:

    CREATE TABLE PostAddresses
    (
      contact_id INTEGER NOT NULL,
      ordinal_nbr SMALLINT NOT NULL,
      PRIMARY KEY (contact_id, ordinal_nbr)
    );

    CREATE TABLE Foos
    (
      contact_id INTEGER NOT NULL,
      ordinal_nbr SMALLINT NOT NULL,
      PRIMARY KEY (contact_id, ordinal_nbr),
      FOREIGN KEY (contact_id, ordinal_nbr) REFERENCES PostAddresses (contact_id, ordinal_nbr)
    );

    CREATE TABLE Bars
    (
      contact_id INTEGER NOT NULL,
      ordinal_nbr SMALLINT NOT NULL,
      numba INTEGER NOT NULL,
      PRIMARY KEY (contact_id, ordinal_nbr, numba),
      FOREIGN KEY (contact_id, ordinal_nbr) REFERENCES Foos (contact_id, ordinal_nbr)
    );

Simple logic: Bars -> Foos -> PostAddresses all by (contact_id, ordinal_nbr), whatever it means.

Here the six entity and respective composite key classes.

    @Entity
    @Table(name = "PostAddresses")
    public class PostAddress implements Serializable
    {
        @EmbeddedId
        private PostAddressId embeddedId;
        
        ...
    }

    @Embeddable
    public class PostAddressId implements Serializable
    {
        @Column(name = "contact_id")
        private Integer contactId;

        @Column(name = "ordinal_nbr")
        private Integer ordinalNbr = 1;

        ...
    }

    @Entity
    @Table(name = "Foos")
    public class Foo implements Serializable
    {
        @EmbeddedId
        private FooId embeddedId;

        @MapsId(value = "postAddressId")
        @OneToOne
        @JoinColumns(value = {@JoinColumn(name = "contact_id", referencedColumnName = "contact_id"), @JoinColumn(name = "ordinal_nbr", referencedColumnName = "ordinal_nbr")})
        private PostAddress postAddress = null;
        
        ...
    }

    @Embeddable
    public class FooId implements Serializable
    {
        @Embedded
        private PostAddressId postAddressId; //just one field!

        ...
    }

    @Entity
    @Table(name = "Bars")
    public class Bar implements Serializable
    {
        @EmbeddedId
        private BarId embeddedId;

        ...
    }

    @Embeddable
    public class BarId implements Serializable
    {
        @Embedded
        private FooId fooId;

        @Column(name = "numba")
        private Integer numba;

        ...
    }

It's really nothing special, Bar references Foo, Foo references PostAddress, all via composite key class. Since the foreign keys are composite and part of the PK, I must nest the ID classes into the ID classes. I thought this is correct. However, I get the following stack trace with EclipseLink 2.2.0:

    Exception in thread "main" Local Exception Stack: 
    Exception [EclipseLink-30005] (Eclipse Persistence Services - 2.2.0.v20101118-r8514): org.eclipse.persistence.exceptions.PersistenceUnitLoadingException
    Exception Description: An exception was thrown while searching for persistence archives with ClassLoader: sun.misc.Launcher$AppClassLoader@1f7182c1
    Internal Exception: javax.persistence.PersistenceException: Exception [EclipseLink-28018] (Eclipse Persistence Services - 2.2.0.v20101118-r8514): org.eclipse.persistence.exceptions.EntityManagerSetupException
    Exception Description: Predeployment of PersistenceUnit [transmuc] failed.
    Internal Exception: java.lang.NullPointerException
        at org.eclipse.persistence.exceptions.PersistenceUnitLoadingException.exceptionSearchingForPersistenceResources(PersistenceUnitLoadingException.java:126)
        at org.eclipse.persistence.jpa.PersistenceProvider.createEntityManagerFactory(PersistenceProvider.java:136)
        at org.eclipse.persistence.jpa.PersistenceProvider.createEntityManagerFactory(PersistenceProvider.java:65)
        at javax.persistence.Persistence.createEntityManagerFactory(Unknown Source)
        at javax.persistence.Persistence.createEntityManagerFactory(Unknown Source)
        at tld.transmuc.Main.main(Main.java:27)
    Caused by: javax.persistence.PersistenceException: Exception [EclipseLink-28018] (Eclipse Persistence Services - 2.2.0.v20101118-r8514): org.eclipse.persistence.exceptions.EntityManagerSetupException
    Exception Description: Predeployment of PersistenceUnit [transmuc] failed.
    Internal Exception: java.lang.NullPointerException
        at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.predeploy(EntityManagerSetupImpl.java:1021)
        at org.eclipse.persistence.internal.jpa.deployment.JPAInitializer.callPredeploy(JPAInitializer.java:95)
        at org.eclipse.persistence.jpa.PersistenceProvider.createEntityManagerFactory(PersistenceProvider.java:127)
        ... 4 more
    Caused by: Exception [EclipseLink-28018] (Eclipse Persistence Services - 2.2.0.v20101118-r8514): org.eclipse.persistence.exceptions.EntityManagerSetupException
    Exception Description: Predeployment of PersistenceUnit [transmuc] failed.
    Internal Exception: java.lang.NullPointerException
        at org.eclipse.persistence.exceptions.EntityManagerSetupException.predeployFailed(EntityManagerSetupException.java:210)
        ... 7 more
    Caused by: java.lang.NullPointerException
        at org.eclipse.persistence.internal.jpa.metadata.accessors.mappings.EmbeddedIdAccessor.process(EmbeddedIdAccessor.java:189)
        at org.eclipse.persistence.internal.jpa.metadata.MetadataDescriptor.processMappingAccessors(MetadataDescriptor.java:1417)
        at org.eclipse.persistence.internal.jpa.metadata.accessors.classes.ClassAccessor.processMappingAccessors(ClassAccessor.java:1405)
        at org.eclipse.persistence.internal.jpa.metadata.accessors.classes.EntityAccessor.processMappingAccessors(EntityAccessor.java:1061)
        at org.eclipse.persistence.internal.jpa.metadata.accessors.classes.EntityAccessor.process(EntityAccessor.java:601)
        at org.eclipse.persistence.internal.jpa.metadata.MetadataProject.processStage2(MetadataProject.java:1464)
        at org.eclipse.persistence.internal.jpa.metadata.MetadataProcessor.processORMMetadata(MetadataProcessor.java:483)
        at org.eclipse.persistence.internal.jpa.deployment.PersistenceUnitProcessor.processORMetadata(PersistenceUnitProcessor.java:453)
        at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.predeploy(EntityManagerSetupImpl.java:975)
        ... 6 more

EclipseLink gives me absolutely no hint as to which class is the offending one. I found out using Hibernate telling me about a problem with the @MapsId annotation and the Foo class:

    org.hibernate.AssertionFailure: Unexpected nested component on the referenced entity when mapping a @MapsId: tld.transmuc.model.Foo

It appears to be an EclipseLink bug. Even if I omit the @Embedded annotation from the ID classes, the exception is still there.