[hibernate-issues] [Hibernate-JIRA] Closed: (HHH-5098) AssertionFailure thrown when collection contains a parameterized type

AssertionFailure thrown when collection contains a parameterized type --------------------------------------------------------------------- Key: HHH-5098 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-5098 Project: Hibernate Core Issue Type: Bug Components: entity-manager Affects Versions: 3.5.0-Final, 3.5.1 Reporter: Kahli Burke Assignee: Steve Ebersole Fix For: 3.5.x, 3.6 Attachments: patch.txt The following exception is thrown when an entity exists with a collection containing a parameterized type: ERROR [AssertionFailure] an assertion failure occured (this may indicate a bug in Hibernate): org.hibernate.annotations.common.AssertionFailure: Fail to process type argument in a generic declaration. Type: class sun.reflect.generics.reflectiveObjects.ParameterizedTypeImpl at org.hibernate.ejb.metamodel.AttributeFactory$PluralAttributeMetadataImpl.getClassFromGenericArgument(AttributeFactory.java:836) at org.hibernate.ejb.metamodel.AttributeFactory$PluralAttributeMetadataImpl.<init>(AttributeFactory.java:748) at org.hibernate.ejb.metamodel.AttributeFactory$PluralAttributeMetadataImpl.<init>(AttributeFactory.java:723) at org.hibernate.ejb.metamodel.AttributeFactory.determineAttributeMetadata(AttributeFactory.java:518) at org.hibernate.ejb.metamodel.AttributeFactory.buildAttribute(AttributeFactory.java:93) at org.hibernate.ejb.metamodel.MetadataContext.wrapUp(MetadataContext.java:183) at org.hibernate.ejb.metamodel.MetamodelImpl.buildMetamodel(MetamodelImpl.java:66) at org.hibernate.ejb.EntityManagerFactoryImpl.<init>(EntityManagerFactoryImpl.java:83) at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:883) at org.hibernate.ejb.HibernatePersistence.createContainerEntityManagerFactory(HibernatePersistence.java:73) at org.jboss.jpa.builder.DefaultCEMFBuilder.build(DefaultCEMFBuilder.java:47) at org.jboss.jpa.deployment.PersistenceUnitDeployment.start(PersistenceUnitDeployment.java:316) For example if a field exists like: @OneToMany List<SomeEntity<SomeClass>> associatedList; I've attached a patch that includes a test case for the entity-manager project and a proposed fix.