I am interested in writing an annotation processor for the maven-processor-plugin. I am relatively new to Maven.
Where in the project path should the processor Java source code go (e.g.: src/main/java/...) so that it gets compiled appropriately, but does not end up as part of my artifact JAR file?
The easiest way is to keep your annotation processor in a separate project that you include as dependency.
If that doesn't work for you, use this config
Compiler Plugin:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.2</version>
<configuration>
<source>1.5</source>
<target>1.5</target>
</configuration>
<inherited>true</inherited>
<executions>
<execution>
<id>default-compile</id>
<inherited>true</inherited>
<configuration>
<!-- limit first compilation run to processor -->
<includes>path/to/processor</includes>
</configuration>
</execution>
<execution>
<id>after-processing</id>
<phase>process-classes</phase>
<goals>
<goal>compile</goal>
</goals>
<inherited>false</inherited>
<configuration>
<excludes>path/to/processor</excludes>
</configuration>
</execution>
</executions>
</plugin>
Processor Plugin:
<plugin>
<groupId>org.bsc.maven</groupId>
<artifactId>maven-processor-plugin</artifactId>
<executions>
<execution>
<id>process</id>
<goals>
<goal>process</goal>
</goals>
<phase>compile</phase>
<configuration>
<processors>
<processor>com.yourcompany.YourProcessor</processor>
</processors>
</configuration>
</execution>
</executions>
</plugin>
(Note that this must be executed between the two compile runs, so it is essential that you place this code in the pom.xml after the above maven-compiler-plugin configuration)
Jar Plugin:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>2.3.1</version>
<configuration>
<excludes>path/to/processor</excludes>
</configuration>
<inherited>true</inherited>
</plugin>
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