JAVA_HOME gets mangled by Maven

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Thats the down side of external links in an accepted answer. Codehaus shut down and thus the solution is gone. For reference here’s the content behind the link – you basically only need to copy the <dependencies>...</dependencies> block to your antrun plugin…

The maven-antrun-plugin runs ant with JAVA_HOME set to the jre subdirectory of the JDK, even if the JAVA_HOME for the overall run is a JDK.
There is documentation elsewhere about how to create a dependency at the project level for the JDK’s tools.jar, but this does not help out antrun, which is a plugin.
The following profile does the job. The ‘..’ in the path hauls up past the ‘jre’ directory to the lib directory. 

<profiles>
      <profile>
          <id>tools.jar</id>
          <build>
            <plugins>
            <plugin>
              <groupId>org.apache.maven.plugins</groupId>
              <artifactId>maven-antrun-plugin</artifactId>
              <dependencies>
                <dependency>
                  <groupId>com.sun</groupId>
                  <artifactId>tools</artifactId>
                  <version>1.5.0</version>
                  <scope>system</scope>
                  <systemPath>${java.home}/../lib/tools.jar</systemPath>
                </dependency>
              </dependencies>
            </plugin>
            </plugins>
          </build>
      </profile>

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