mirror of https://github.com/apache/openjpa.git
42 lines
1.8 KiB
Plaintext
42 lines
1.8 KiB
Plaintext
Apache OpenJPA - Metamodel generator (mmg) README
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Licensed under Apache License 2.0 - http://www.apache.org/licenses/LICENSE-2.0
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JPA 2.0 provides an utility to generate canonical metamodel for each persistent
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domain entity. This brief note describes how to generate these canonical
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metamodel classes.
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The canonical metamodel classes are generated during compilation of persistent
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domain entity classes. The generation process depends on Annotation Processing
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facility available in JDK6. Naturally, this process *only* works if the
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persistent domain entity classes are compiled with a JDK6 compiler.
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Effectively, the process appears to be normal compilation process with a
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specialized Annotation Processor:
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$ javac -classpath %CLASSPATH% <javac options> <mmg options> <*.java source files>
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Compiler Classpath
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------------------
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The compiler classpath must include OpenJPA libraries.
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mmg options
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-----------
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These options specify the Annotation processor to be used as well as options
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for the processor. The only mandatory option is:
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-processor org.apache.openjpa.persistence.meta.AnnotationProcessor6
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The other options qualify the Annotation processor itself and specified
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with -A<option>=<value> syntax:
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-Alog log level. Permissible values are TRACE, INFO and WARN.
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Default is INFO.
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-Aout the directory location of the generated canonical model source output
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files. Default is the current directory.
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-Asource compatibility level of the generated canonical model source code.
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Permissible values are 5 and 6. Default is 6.
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-Aheader flags if a header is created for the generated source code.
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Permissible values are true and false. Default is true.
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