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

["Craig Russell (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/OPENJPA-147?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12473224 ] 

Craig Russell commented on OPENJPA-147:
---------------------------------------

>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" 

With a), does the failure occur in OpenJPA code, or does the compiler complain? What is the stack trace?

With b), did you provide metadata as a file, in addition to referring to the interface in persistence.xml?


> <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
>
> 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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