[hibernate-issues] [Hibernate-JIRA] Created: (HHH-6589) Support "Any" mappings when building metamodel

[Robert Brady (JIRA)]

Support "Any" mappings when building metamodel
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                 Key: HHH-6589
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-6589
             Project: Hibernate Core
          Issue Type: Improvement
          Components: entity-manager
    Affects Versions: 3.5.6
         Environment: Hibernate entity manager 3.5.5, PostgreSQL 8.4
            Reporter: Robert Brady


I am upgrading from Hibernate 3.2.x to 3.5.5 and getting UnsupportedOperationExceptions thrown when Hibernate is trying to create the metamodel.  This is due to the dependency of my application upon jBPM 3.x, which uses "any" mappings for some of its classes.

The exception occurs in org.hibernate.ejb.metamodel.AttributeFactory.determineAttributeMetadata(...)
{noFormat}
java.lang.UnsupportedOperationException: any not supported yet
at org.hibernate.ejb.metamodel.AttributeFactory.determineAttributeMetadata(AttributeFactory.java:452)
{noFormat}

It is due to the logic in AttributeFactory at line 451:
{noFormat}
if ( type.isAnyType() ) {
   throw new UnsupportedOperationException( "any not supported yet" );
}
{noFormat}

The "Big Hammer" approach of globally disabling the creation of the metamodel with the property setting:
{noFormat}
hibernate.ejb.metamodel.generation=disabled
{noFormat}
is not feasible: other components in my application depend upon the criteria search api, which need a generated meatamodel.  Splitting the single application persistence unit into two parts ( one for the jBPM persisted classes with metamodel disabled and all other classes with metamodel enabled) is not feasible either.  The split persistence unit approach would also split transaction boundaries of operations that are desired to be in a single transaction.

Hibernate should support "any" mappings in the metamodel.  The @Any annotation is supported in Hibernate Annotation 3.5.5.

If Hibernate can not support "any" mappings then maybe it could:
* Allow the exclusion of persistent classes by package in the metamodel.  I tried this successfully by changing the following code in org.hibernate.ejb.EntityManagerFactoryImpl constructor:
{noFormat}
...
List<PersistentClass> persistentClasses = new ArrayList<PersistentClass>();
while (classes.hasNext()) {
    PersistentClass persistentClass = classes.next();
    // Hardcode jBPM classes for now, but make tidy with a property like "hibernate.ejb.metamodel.excluded.pkgs"
    if (persistentClass.getClassName().startsWith("org.jbpm")) {
       continue;
    } else {
       persistentClasses.add(persistentClass);
    }
}
// a safe guard till we are confident that metamodel is wll tested
if (!"disabled".equalsIgnoreCase(cfg.getProperty("hibernate.ejb.metamodel.generation"))) {
    this.metamodel = MetamodelImpl.buildMetamodel(persistentClasses.iterator(),
            (SessionFactoryImplementor) sessionFactory);}
...
{noFormat}
* Exclude persistent classes having "any" mappings from the metamodel generation.  


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