maven-compiler-plugin/src/test/resources/unit/compiler-fork-test/plugin-config.xml

<!--
  ~ Copyright 2001-2006 The Apache Software Foundation.
  ~
  ~ Licensed under the Apache License, Version 2.0 (the "License");
  ~ you may not use this file except in compliance with the License.
  ~ You may obtain a copy of the License at
  ~
  ~      http://www.apache.org/licenses/LICENSE-2.0
  ~
  ~ Unless required by applicable law or agreed to in writing, software
  ~ distributed under the License is distributed on an "AS IS" BASIS,
  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  ~ See the License for the specific language governing permissions and
  ~ limitations under the License.
  -->

<project>
  <build>
    <plugins>
      <plugin>
        <artifactId>maven-compiler-plugin</artifactId>
        <configuration>
          <fork>true</fork>
          <!--
             basedir is required to be set when forking
          -->
          <basedir>${basedir}</basedir>
          <meminitial>64m</meminitial>
          <maxmem>128m</maxmem>
          <showWarnings>true</showWarnings>
          <verbose>true</verbose>
          <compileSourceRoots>
            <compileSourceRoot>${basedir}/target/test-classes/unit/compiler-fork-test/src/main/java</compileSourceRoot>
          </compileSourceRoots>
          <compilerId>javac</compilerId>
          <debug>true</debug>
          <executable>javac</executable>
          <outputDirectory>${basedir}/target/test/unit/compiler-fork-test/target/classes</outputDirectory>
          <buildDirectory>${basedir}/target/test/unit/compiler-fork-test/target</buildDirectory>
        </configuration>
      </plugin>
    </plugins>
  </build>
</project>