mirror of https://github.com/apache/openjpa.git
38 lines
1.8 KiB
Plaintext
38 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 domain entity.
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This brief note describes how to generate these canonical metamodel classes.
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The canonical metamodel classes are generated during compilation of persistent domain entity classes.
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The generation process depends on Annotation Processing facility available in JDK6. Naturally, this
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process *only* works if the 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 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 for the processor. The only mandatory
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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 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 files.
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Default is the current directory.
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-Asource compatibility level of the generated canonical model source code. Permissible values are 5 and 6.
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Default is 6.
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-Aheader flags if a header is created for the generated source code. Permissible values are true and false.
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Default is true.
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