Apache OpenJPA - Metamodel generator (mmg) readme Licensed under Apache License 2.0 - http://www.apache.org/licenses/LICENSE-2.0 -------------------------------------------------------------------------------- JPA 2.0 provides an utility to generate canonical metamodel for each persistent domain entity. This brief note describes how to generate these canonical metamodel classes. The canonical metamodel classes are generated during compilation of persistent domain entity classes. The generation process depends on Annotation Processing facility available in JDK6. Naturally, this process *only* works if the persistent domain entity classes are compiled with a JDK6 compiler. Effectively, the process appears to be normal compilation process with a specialized Annotation Processor $ javac -classpath %CLASSPATH% <*.java source files> Compiler Classpath ------------------ The compiler classpath must include OpenJPA libraries. mmg options ----------- These options specify the Annotation processor to be used as well as options for the processor. The only mandatory option is -processor org.apache.openjpa.persistence.meta.AnnotationProcessor6 The other options qualify the Annotation processor itself and specified with -A