[hibernate-issues] [Hibernate-JIRA] Created: (HHH-2336) UserCollectionType: add support for ParameterizedTypes and typedef'ed types to the collection-type attribute for a collection mapping

[Holger Brands (JIRA)]

UserCollectionType: add support for ParameterizedTypes and typedef'ed types to the collection-type attribute for a collection mapping
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         Key: HHH-2336
         URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2336
     Project: Hibernate3
        Type: Improvement

  Components: core  
    Versions: 3.2.1    
 Environment: Hibernate 3.2.1, independent of database platform
    Reporter: Holger Brands
 Attachments: usercollectionwithparameters.zip

Currently, it's required to specify a class name as value for the collection-type attribute of a collection mapping.
Therefore you can't use a typedef'ed type as collection-type and consequently you can't pass parameters to a custom collection type.

Please enhance the support for custom collection types such that you can do something like this:

<typedef name="MyEventListType" class="ca.odell.glazedlists.hibernate.EventListType">
        <param name="category">Test</param>
</typedef>
<class name="User" table="`USERS`">
        <id name="userName" column="USERNAME"/>
        <!-- mapping a value collection -->
        <list name="nickNames" table="USER_NICKNAMES"
            collection-type="MyEventListType">
            <key column="USER_ID"/>
            <list-index column="DISPLAY_ORDER"/>
            <element column="NAME" type="string" length="50"/>
        </list>       
</class>

Currently this mapping fails with this exception:

org.hibernate.MappingException: user colllection type class not found: MyEventListType
   at org.hibernate.type.TypeFactory.customCollection(TypeFactory.java:267)
   at org.hibernate.mapping.Collection.getCollectionType(Collection.java:348)
   at org.hibernate.mapping.Collection.getType(Collection.java:340)
   at org.hibernate.tuple.PropertyFactory.buildStandardProperty(PropertyFactory.java:120)
   at org.hibernate.tuple.entity.EntityMetamodel.<init>(EntityMetamodel.java:163)
   at org.hibernate.persister.entity.AbstractEntityPersister.<init>(AbstractEntityPersister.java:425)
   at org.hibernate.persister.entity.SingleTableEntityPersister.<init>(SingleTableEntityPersister.java:109)
   at org.hibernate.persister.PersisterFactory.createClassPersister(PersisterFactory.java:55)
   at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:226)
   at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1291)
   at ca.odell.glazedlists.hibernate.AbstractHibernateTestCase.buildSessionFactory(AbstractHibernateTestCase.java:133)
   at ca.odell.glazedlists.hibernate.AbstractHibernateTestCase.setUp(AbstractHibernateTestCase.java:167)
   at junit.framework.TestCase.runBare(TestCase.java:125)
   at junit.framework.TestResult$1.protect(TestResult.java:106)
   at junit.framework.TestResult.runProtected(TestResult.java:124)
   at junit.framework.TestResult.run(TestResult.java:109)
   at junit.framework.TestCase.run(TestCase.java:118)
   at junit.framework.TestSuite.runTest(TestSuite.java:208)
   at junit.framework.TestSuite.run(TestSuite.java:203)
   at org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:128)
   at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
   at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
   at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
   at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
   at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)
Caused by: java.lang.ClassNotFoundException: MyEventListType
   at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
   at java.security.AccessController.doPrivileged(Native Method)
   at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
   at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
   at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
   at java.lang.Class.forName0(Native Method)
   at java.lang.Class.forName(Class.java:164)
   at org.hibernate.util.ReflectHelper.classForName(ReflectHelper.java:100)
   at org.hibernate.type.TypeFactory.customCollection(TypeFactory.java:264)
   ... 24 more

Also see the coresponding forum entry for details:
http://forum.hibernate.org/viewtopic.php?t=969043

Attached is a test case that demonstrates this problem.
It's a modified copy of the existing "usercollection" test case in the Hibernate 3.2.1 distribution.
Just copy the directory into your org.hibernate.test directory and include it in your testsuite.

As I'm not familiar enough with the internals of Hibernate, I have no patch at hand, sorry.

Resolving this issue would enhance mapping flexibility for custom collection types because you
would be able to pass parameters as it's possible right now for UserTypes and CompositeUserTypes.


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