Re: [eclipselink-users] Virtual entities and XMLMetadataSource

[Tom Ware <tom.ware@xxxxxxxxxx>]

Hi Harpreet,

  Do you still see the same problem with the latest 2.4.2 milestone?

-Tom

On 06/11/2012 5:43 PM, Harpreet Singh 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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