mirror of https://github.com/apache/openjpa.git
36 lines
1.6 KiB
Plaintext
36 lines
1.6 KiB
Plaintext
|
Metamodel generator (mmg)
|
||
|
|
|
||
|
|
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% <javac options> <mmg options> <*.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<option>=<value> syntax
|
||
|
|
|
||
|
|
-Alog log level. Permissible values are TRACE, INFO and WARN.
|
||
|
|
Default is INFO.
|
||
|
|
-Aout the directory location of the generated canonical model source output files.
|
||
|
|
Default is the current directory.
|
||
|
|
-Asource compatibility level of the generated canonical model source code. Permissible values are 5 and 6.
|
||
|
|
Default is 6.
|
||
|
|
-Aheader flags if a header is created for the generated source code. Permissible values are true and false.
|
||
|
|
Default is true.
|
||
|
|
|