Annotation processor output in maven

Question

I\'m using JSR 269 as a way to analyze code during compilation and to fail it if needed. I\'m having troubles with displaying output of my annotation processor in maven (Ant

Answer 1

I think you are running into a Maven bug or better a bug in the compiler plugin - MCOMPILER-66. When it comes to annotation processing the compiler plugin has several problems, eg also MCOMPILER-62. Really the best option imo is to disable annotation processing for the compiler plugin and use the maven-processor-plugin. In this blog post you can see how to use it. It looks like this:

   <plugins>
    <plugin>
        <artifactId>maven-compiler-plugin</artifactId>
        <configuration>
            <source>1.6</source>
            <target>1.6</target>
            <compilerArgument>-proc:none</compilerArgument>
        </configuration>
    </plugin>
    <plugin>
        <groupId>org.bsc.maven</groupId>
        <artifactId>maven-processor-plugin</artifactId>
        <version>1.3.7</version>
        <executions>
            <execution>
                <id>process</id>
                <goals>
                    <goal>process</goal>
                </goals>
                <phase>process-sources</phase>
            </execution>
        </executions>
        <dependencies>
            <dependency>
                <groupId>org.hibernate</groupId>
                <artifactId>hibernate-jpamodelgen</artifactId>
                <version>1.1.0.Final</version>
                <scope>compile</scope>
            </dependency>
        </dependencies>
    </plugin>

Note also how the annotation processor dependency is nicely scoped to the plugin only.

Answer 2

You can do this by enabling showWarnings flag in the maven-compiler-plugin configuration:

<build>
  <plugins>
    <plugin>
       <groupId>org.apache.maven.plugins</groupId>
       <artifactId>maven-compiler-plugin</artifactId>
       <configuration>
         <showWarnings>true</showWarnings>
       </configuration>
    </plugin>
  </plugins>
</build>

See also https://github.com/Cosium/annotation-processor-logger#enable-all-logging-levels