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Re: [eclipselink-users] Virtual entities and XMLMetadataSource
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Hi Harpreet,
Would would your users be adding in SubProject? How would it be different
from a Project with some virtual attributes?
-Tom
On 13/11/2012 3:14 PM, Harpreet Singh wrote:
Tom, thanks for all your help. Can you expand on what you mean by create a
static entity with a one-to-one with the dynamic entity? How would that work?
Hi Harpreet,
Currently Dynamic entities are implemented using weaving and the weaving
support will not take into account a parent class other than
DynamicEntityImpl. As a result, I'm afraid you won't be able to create a
dynamic entity that is a subclass of an existing entity. Please feel free to
add an enhancement request.
Perhaps you can, instead create a static entity that has a One-to-One with
the dynamic entity and hide relationship in your getters and setters.
-Tom
On Mon, Nov 12, 2012 at 12:00 PM, Harpreet Singh <hsingh9@xxxxxxxxx
<mailto:hsingh9@xxxxxxxxx>> wrote:
Hi Tom,
I'm looking for both. In my project I have a entity called Project, which
is extensible and uses VirtualAccessMethods. Using this and
XMLMetaDataSource I allow my user to add new attributes to the project
entity. Now I want to go further and allow the user to create a SubProject
entity for example. This new dynamic entity created by the user would extend
entities that I ship, e.g. Project. I thought I could use DynamicEntities to
achieve this. However, it seems Project would have to extend
DynamicEntityImpl and implement the fetchPropertiesManager method, which I'm
not sure how to do. Is this the only way to do this in eclipselink?
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
<http://wiki.eclipse.org/EclipseLink/Examples/JPA/Extensibility>
-Tom
On Thu, Nov 8, 2012 at 2:38 PM, Harpreet Singh <hsingh9@xxxxxxxxx
<mailto:hsingh9@xxxxxxxxx>> 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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