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Re: [eclipselink-users] Virtual entities and XMLMetadataSource 
Hi Harpreet,

  Are you looking for a dynamic entity, or just an extensible entity?
DynamicEntities must extend DynamicEntityImpl. Any entity can be extensible. See: 

http://wiki.eclipse.org/EclipseLink/Examples/JPA/Extensibility

-Tom


On 08/11/2012 2:38 PM, Harpreet Singh wrote:

Tom,
  I get a little further with the latest 2.4.2 milestone. Now I get the error
below. I guess this means that my user definable dynamic entity cannot extend
something I ship in the product. Is there any other way to achieve this
inheritance? I want the dynamic entity to extend the entity I ship with the
product, which is not a dynamic entity.

Caused by: java.lang.IllegalArgumentException: DynamicClassLoader:
com.foo.Project not compatible with parent class
org.eclipse.persistence.internal.dynamic.DynamicEntityImpl
at
org.eclipse.persistence.dynamic.DynamicClassLoader.checkAssignable(DynamicClassLoader.java:174)
at
org.eclipse.persistence.dynamic.DynamicClassLoader.createDynamicClass(DynamicClassLoader.java:167)
at
org.eclipse.persistence.internal.jpa.metadata.MetadataProject.createDynamicClass(MetadataProject.java:844)
at
org.eclipse.persistence.internal.jpa.metadata.MetadataProject.createDynamicClass(MetadataProject.java:838)
at
org.eclipse.persistence.internal.jpa.metadata.MetadataProject.createDynamicClass(MetadataProject.java:838)
at
org.eclipse.persistence.internal.jpa.metadata.MetadataProject.createDynamicClasses(MetadataProject.java:865)
at
org.eclipse.persistence.internal.jpa.metadata.MetadataProcessor.createDynamicClasses(MetadataProcessor.java:153)
at
org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:469)
... 60 more


On Tue, Nov 6, 2012 at 5:30 PM, Harpreet Singh <hsingh9@xxxxxxxxx
<mailto:hsingh9@xxxxxxxxx>> wrote:

    In my project I need to be able to create a dynamic entity which extends a
    regular entity. The dynamic/virtual entity definition is loaded at startup
    from a configuration database (not using eclipselink). For this I've created
    a XMLMetadataSource which provides eclipselink with the dynamic entity
    definition, however startup fails b/c eclipselink is using the real
    classloader instead of the dynamic classloader. I'm using EclipseLink 2.4.0.

    Code from Metadatasource:

    EntityAccessor accessor = new EntityAccessor();
         accessor.setName("SubProject");
         //dynamic entity
         accessor.setClassName("com.foo.SubProject");
         //regular entity, see com/foo/Project.java
         accessor.setParentClassName("com.foo.Project");
         accessor.setAccess("VIRTUAL");
         accessor.setDiscriminatorValue("SP");

         List<SecondaryTableMetadata> secondaryTables = new
    ArrayList<SecondaryTableMetadata>();
         SecondaryTableMetadata table = new SecondaryTableMetadata();
         table.setName("pln_sub_project");
         secondaryTables.add(table);
         accessor.setSecondaryTables(secondaryTables);

         //based on Metadatasource example
         addExtension(accessor, new Extension("com.foo.SubProject",
    "java.lang.String", "foo"));
         mappings.getEntities().add(accessor);

    The problem seems to be here in EntityManagerSetupImpl#deploy(Classloader, Map)

    processor.setClassLoader(realClassLoader);
    processor.createDynamicClasses();

    The processor ends up using the realClassLoader instead of the dynamic class
    loader supplied in PersistenceUnit properties resulting in the following error:

    Caused by: Exception [EclipseLink-28019] (Eclipse Persistence Services -
    2.4.0.v20120608-r11652):
    org.eclipse.persistence.exceptions.EntityManagerSetupException
    Exception Description: Deployment of PersistenceUnit [p] failed. Close all
    factories for this PersistenceUnit.
    Internal Exception: Exception [EclipseLink-7328] (Eclipse Persistence
    Services - 2.4.0.v20120608-r11652):
    org.eclipse.persistence.exceptions.ValidationException
    Exception Description: When using VIRTUAL access a DynamicClassLoader must
    be provided when creating the entity manager factory using the eclipselink
    property [eclipselink.classloader]. That is,
    createEntityManagerFactory(String persistenceUnitName, Map properties) and
    add a new DynamicClassLoader() to the Map properties.
    at
    org.eclipse.persistence.exceptions.EntityManagerSetupException.deployFailed(EntityManagerSetupException.java:229)
    ... 62 more
    Caused by: Exception [EclipseLink-7328] (Eclipse Persistence Services -
    2.4.0.v20120608-r11652): org.eclipse.persistence.exceptions.ValidationException
    Exception Description: When using VIRTUAL access a DynamicClassLoader must
    be provided when creating the entity manager factory using the eclipselink
    property [eclipselink.classloader]. That is,
    createEntityManagerFactory(String persistenceUnitName, Map properties) and
    add a new DynamicClassLoader() to the Map properties.
    at
    org.eclipse.persistence.exceptions.ValidationException.invalidClassLoaderForDynamicPersistence(ValidationException.java:1070)
    at
    org.eclipse.persistence.internal.jpa.metadata.MetadataProject.createDynamicClasses(MetadataProject.java:861)
    at
    org.eclipse.persistence.internal.jpa.metadata.MetadataProcessor.createDynamicClasses(MetadataProcessor.java:153)
    at
    org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:463)
    ... 60 more
    [EL Severe]: ejb: 2012-11-06
    17:17:42.19--ServerSession(29272897)--Thread(Thread[http-bio-8080-exec-3,5,main])--Local
    Exception Stack:
    Exception [EclipseLink-7328] (Eclipse Persistence Services -
    2.4.0.v20120608-r11652): org.eclipse.persistence.exceptions.ValidationException
    Exception Description: When using VIRTUAL access a DynamicClassLoader must
    be provided when creating the entity manager factory using the eclipselink
    property [eclipselink.classloader]. That is,
    createEntityManagerFactory(String persistenceUnitName, Map properties) and
    add a new DynamicClassLoader() to the Map properties.
    at
    org.eclipse.persistence.exceptions.ValidationException.invalidClassLoaderForDynamicPersistence(ValidationException.java:1070)
    at
    org.eclipse.persistence.internal.jpa.metadata.MetadataProject.createDynamicClasses(MetadataProject.java:861)
    at
    org.eclipse.persistence.internal.jpa.metadata.MetadataProcessor.createDynamicClasses(MetadataProcessor.java:153)
    at
    org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:463)
    at
    org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.getDatabaseSession(EntityManagerFactoryDelegate.java:186)
    at
    org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.getMetamodel(EntityManagerFactoryDelegate.java:602)
    at
    org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.getMetamodel(EntityManagerFactoryImpl.java:516)




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