[jira] Updated: (OPENJPA-147) T OpenJPAEntityManager.createInstance(Class cls) fails when T is interface

["Pinaki Poddar (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/OPENJPA-147?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Pinaki Poddar updated OPENJPA-147:
----------------------------------

    Attachment: iface.trace.3.txt

> <T> T OpenJPAEntityManager.createInstance(Class<T> cls) fails when T is interface
> ---------------------------------------------------------------------------------
>
>                 Key: OPENJPA-147
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-147
>             Project: OpenJPA
>          Issue Type: Bug
>          Components: jpa
>            Reporter: Pinaki Poddar
>         Attachments: iface.trace.1.txt, iface.trace.2.txt, iface.trace.3.txt, iface.trace.4.txt
>
>
> According to JavaDoc, OpenJPAEntityManager.createInstance() method 
>        public <T> T createInstance(Class<T> cls);
>      behaves as follows:
> "Create a new instance of type <code>cls</code>. If <code>cls</code> is
>   an interface or an abstract class whose abstract methods follow the
>   JavaBeans convention, this method will create a concrete implementation
>   according to the metadata that defines the class"
> The method fails when T is an interface. The failure may be due to incorrect user configuration, however, further
> information on this extension method is not available in OpenJPA documentation.
> Firstly, how to specify metadata for a interface that has bean-style methods? 
> Possibilities are:
> a) Annotating the Java interface definition with @Entity 
> b) Specifying in <class>org.acme.IPerson</class> in persistence.xml
> Either of the above fails. a) fails at parsing b) fails with "no metadata" 
> There may be a correct but undocumented way of specifying a managed interface. If that is the case, then this JIRA report should be treated as a documentation bug. 
>  

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