Instantiate meta-model classes for JPA 2.0 from source code annotations
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Key: OPENJPA-1010
URL: https://issues.apache.org/jira/browse/OPENJPA-1010
Project: OpenJPA
Issue Type: New Feature
Components: jpa
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.
Source code 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.
While it is possible, albeit more complex, to support both style (they are not
only based on different libraries, their life-cycle is somewhat different too),
at this stage we will scope this activity to support only JDK 6 environment
i.e. we assume that the user application compiles with a JDK6 compiler.
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