[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-4275) Method in entity with return type of ArrayList<Object[]> causes failure to build session factory

[Ivan Prisiazhnyy (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-4275?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=37683#action_37683 ] 

Ivan Prisiazhnyy commented on HHH-4275:
---------------------------------------

The same error goes in Hibernate Distribution 3.5.3-Final when there is a FIELD in the mapping class containing Array of Collection generic interfaces. See following code:

private Collection<Thing>[][] levels;

If you change generic collection to extender interface of it or use just a Collection, hibernate goes fine.
The following code works:

private Collection[][] levels;
private CollectionOfThing[][] levels;
private List<Thing>[][] levels;


> Method in entity with return type of ArrayList<Object[]> causes failure to build session factory
> ------------------------------------------------------------------------------------------------
>
>                 Key: HHH-4275
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-4275
>             Project: Hibernate Core
>          Issue Type: Bug
>          Components: annotations
>         Environment: Hibernate 3.2.X, no database needed (happens during factory build before connecting to db)
>            Reporter: Clint Popetz
>         Attachments: propertyTypeExtractorBug.tar.gz
>
>
> The following source:
> @javax.persistence.Entity
> public class TestEntity {
>         
>         @javax.persistence.Id
>         public int Id;
>         
>         public java.util.ArrayList<Object[]> badMethod() { return null; }
>         public static void main(String args[]) {
>                         new org.hibernate.cfg.AnnotationConfiguration().addAnnotatedClass(TestEntity
> .class).configure().buildSessionFactory();
>   }
> }
> will cause:
> java.lang.IllegalArgumentException: No PropertyTypeExtractor available for type void
> at org.hibernate.annotations.common.reflection.java.JavaReflectionManager.toXType(JavaReflectionManager.java:164)^M
> at org.hibernate.annotations.common.reflection.java.JavaXMethod.create(JavaXMethod.java:18)
> at org.hibernate.annotations.common.reflection.java.JavaReflectionManager.getXMethod(JavaReflectionManager.java:128)
> at org.hibernate.annotations.common.reflection.java.JavaXClass.getDeclaredMethods(JavaXClass.java:114)
> at org.hibernate.validator.ClassValidator.initValidator(ClassValidator.java:214)
> at org.hibernate.validator.ClassValidator.<init>(ClassValidator.java:133)
> at org.hibernate.validator.event.ValidateEventListener.initialize(ValidateEventListener.java:91)
> at org.hibernate.event.EventListeners.initializeListeners(EventListeners.java:356)
> at org.hibernate.cfg.Configuration.getInitializedEventListeners(Configuration.java:1304)
> at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1294) 
> Changing the return type to List<Object[]> avoids the bug.
> Attached is a tgz of an ant-buildable project; typing "ant run" will illustrate the bug.

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