[GSoC 2011] Provide XML-based configuration for OpenJPA's custom metadata and
mapping extensions
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Key: OPENJPA-1971
URL: https://issues.apache.org/jira/browse/OPENJPA-1971
Project: OpenJPA
Issue Type: New Feature
Components: competitive, jpa, usability
Affects Versions: 2.2.0
Reporter: Jeremy Bauer
Context: The JPA specification includes many annotations for the specification
of metadata and mapping information within Java classes. In addition, the spec
provides a means to supply the same information within XML configuration files
(orm.xml). One primary benefit of XML config files is it allows modification
of the ORM information without needing to recompile the source code.
OpenJPA has many custom metadata and mapping annotations that can be used to
provided functionality beyond the JPA specification. However, these extensions
are available only through annotations. There is currently no means to specify
the metadata or mapping extensions via XML. We've had several requests for
this capability, but it hasn't seen much/any activity.
Task:
1) Understand OpenJPA's annotation extensions.
2) Determine which annotations make sense to provide in XML configuration
3) Design a schema for the XML-based configuration file (openjpa-orm.xml?)
4) Creating metadata and mapping parsers for the new XML mapping file
5) Wire the new parsers into the existing code path.
6) Provide adequate jUnit tests for the new function.
Mentor: techhusky at gmail dot com
Complexity: moderate
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