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https://issues.apache.org/jira/browse/OPENJPA-147?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12557843#action_12557843
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Pinaki Poddar commented on OPENJPA-147:
---------------------------------------
Excellent!
But something I am still missing once I changed to new @ManagedInterface
Here is an Interface:
===================================================
package jira147;
import org.apache.openjpa.persistence.ManagedInterface;
@ManagedInterface
public interface IPerson {
public String getName();
public void setName(String name);
}
=====================================================
Here is a test methood
public void testNewInstance() {
EntityManager em = emf.createEntityManager();
OpenJPAEntityManager oem = (OpenJPAEntityManager)em;
Object ipc = oem.createInstance(IPerson.class);
oem.getTransaction().begin();
oem.persist(ipc);
oem.getTransaction().commit();
}
=====================================================
Here is a persistence unit
<persistence-unit name="test">
<class>jira147.IPerson</class>
<properties>
<property name="openjpa.ConnectionDriverName"
value="com.mysql.jdbc.Driver"/>
<property name="openjpa.ConnectionURL"
value="jdbc:mysql://localhost/openjpa"/>
</properties>
</persistence-unit>
====================================================
Here is the console
Using OpenJPA 420667:610924
62 test INFO [main] openjpa.Runtime - Starting OpenJPA 1.1.0-SNAPSHOT
=======================================================
Here is the Stack Trace
java.lang.IllegalArgumentException: No registered metadata for type "interface
jira147.IPerson".
at org.apache.openjpa.enhance.PCRegistry.getMeta(PCRegistry.java:255)
at
org.apache.openjpa.enhance.PCRegistry.newInstance(PCRegistry.java:111)
at
org.apache.openjpa.kernel.BrokerImpl.newInstance(BrokerImpl.java:4167)
at
org.apache.openjpa.kernel.DelegatingBroker.newInstance(DelegatingBroker.java:1358)
at
org.apache.openjpa.persistence.EntityManagerImpl.createInstance(EntityManagerImpl.java:1068)
at jira147.TestInterface.testNewInstance(TestInterface.java:22)
> <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: New Feature
> Components: jpa
> Reporter: Pinaki Poddar
> Fix For: 1.1.0
>
> Attachments: iface.trace.1.txt, iface.trace.2.txt, iface.trace.3.txt,
> iface.trace.4.txt, IPerson.java, TestInterface.java
>
>
> 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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