Tom,
Users would be adding SubProject. SubProject may include additional attributes
that do not exist in Project. Users may add multiple children under Project:
SubProject, MiniProject, TempProject, etc...
Could you please explain how to "create a static entity that has a One-to-One
with the dynamic entity and hide relationship in your getters and setters"? From
what I can see dynamic entities can only have relationships to other dynamic
entities.
Hi Harpreet,
Would would your users be adding in SubProject? How would it be different
from a Project with some virtual attributes?
-Tom
On Tue, Nov 13, 2012 at 3:14 PM, Harpreet Singh <hsingh9@xxxxxxxxx
<mailto:hsingh9@xxxxxxxxx>> 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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