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From "Pinaki Poddar (JIRA)" <j...@apache.org>
Subject [jira] Created: (OPENJPA-1011) Instantiate meta-model classes for JPA 2.0 from XML descriptors
Date Tue, 31 Mar 2009 16:26:50 GMT
Instantiate meta-model classes for JPA 2.0 from XML descriptors
---------------------------------------------------------------

                 Key: OPENJPA-1011
                 URL: https://issues.apache.org/jira/browse/OPENJPA-1011
             Project: OpenJPA
          Issue Type: Improvement
            Reporter: Pinaki Poddar
            Assignee: Pinaki Poddar
             Fix For: 2.0.0-M1


JPA 2.0 has introduced a specification for strictly-typed dynamic query construction. The
type-strictness is based on availability of a meta-model. The user application can either
use meta-model API to access the type information or instantiate the meta-model (referred
as canonical meta-model) with a set of auto-generated classes for compile-time binding. This
issue refers to instantiating the canonical meta-model at compile-time.
The process involves processing source code annotations or xml descriptors.

Annotation processing support in Java platform has significantly changed across JDK version
5 and 6. In JDK5, the annotation processing was supported by a command-line tool named apt
based on com.sun.mirror API library. In JDK 6, the annotation processing is more seamlessly
integrated with javac compilation process with javax.annotation API libraries.

It is not obvious at this point on how to hook into compiler life-cycle when source code has
*no* annotation and persistence meta-data is *only* available in XML descriptors.

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