executablewar
=============

This package can be overlaid into a WAR file to make it executable,
automatically loading the WEB-INF/lib directory into the classpath
and launching a different main class.

Add the magic block to your Maven pom.xml, setting the value of
`Executable-War-Package` to the package of your main classes.

With this magic in place, users can execute your WAR file as
a standard JAR, including the class name on the command line:

====
  java -jar your.war Action ...
====

At runtime the class `${Executable-War-Package}.${Action}` will be
loaded dynamically from the WEB-INF/lib directory and its static
main method will be invoked with all remaining arguments.

Files under `WEB-INF/` may also be accessed by the built-in actions
`--ls` (list files) and `--cat` (output content to standard out).
This may be useful for user-level documentation to unpack resources
packaged with the application.  The `WEB-INF`/ prefix is assumed by
these actions, and should not be specified on the command line.


pom.xml magic
-------------

====
  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-war-plugin</artifactId>
        <configuration>
          <archive>
            <manifest>
              <mainClass>ExecutableWarMain</mainClass>
            </manifest>
            <manifestEntries>
              <Executable-War-Package>your.package.prefix</Executable-War-Package>
            </manifestEntries>
          </archive>
        </configuration>
      </plugin>

      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-dependency-plugin</artifactId>
        <executions>
          <execution>
            <id>make-executable</id>
            <phase>generate-resources</phase>
            <goals>
              <goal>unpack</goal>
            </goals>
            <configuration>
              <artifactItems>
                <artifactItem>
                  <groupId>gerrit</groupId>
                  <artifactId>executablewar</artifactId>
                  <overWrite>true</overWrite>
                  <outputDirectory>${project.build.directory}/executablewar</outputDirectory>
                  <includes>**/*.class</includes>
                </artifactItem>
              </artifactItems>
            </configuration>
          </execution>
        </executions>
      </plugin>

      <plugin>
        <artifactId>maven-antrun-plugin</artifactId>
        <executions>
          <execution>
            <id>fix-output</id>
            <phase>process-classes</phase>
            <configuration>
              <tasks>
                <property name="d" location="${basedir}/target/${project.name}-${project.version}"/>

                <copy todir="${d}">
                  <fileset dir="${basedir}/target/executablewar" includes="**/*"/>
                </copy>
              </tasks>
            </configuration>
            <goals>
              <goal>run</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>

  <dependencies>
    <dependency>
      <groupId>gerrit</groupId>
      <artifactId>executablewar</artifactId>
      <version>1.0-SNAPSHOT</version>
      <scope>provided</scope>
    </dependency>
  </dependencies>
====