Instantiate meta-model classes for JPA 2.0 from XML descriptors
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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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