Executable WAR

Recently I created very small and lightweight web application. It supposed to be using web sockets, so I decided to use Jetty as application server, but instead of using it like container, I decided to save on project and configuration folders and scripts and deploy it as executable WAR.
It was surprisingly easy to do. Basically, only thing that is needed is maven with Shade plugin. This plugin allows to pack all dependencies together in single JAR. Also it allows to modify manifest, and comes with simple examples.
So, all you need to do is to add jetty dependencies to pom.xml, for example:

        <dependency>
            <groupId>org.eclipse.jetty</groupId>
            <artifactId>jetty-server</artifactId>
            <version>8.0.0.M2</version>
        </dependency>

        <dependency>
            <groupId>org.eclipse.jetty</groupId>
            <artifactId>jetty-jndi</artifactId>
            <version>8.0.0.M2</version>
        </dependency>

        <dependency>
            <groupId>org.eclipse.jetty</groupId>
            <artifactId>jetty-plus</artifactId>
            <version>8.0.0.M2</version>
        </dependency>

        <dependency>
            <groupId>org.eclipse.jetty</groupId>
            <artifactId>jetty-start</artifactId>
            <version>8.0.0.M2</version>
        </dependency>

        <dependency>
            <groupId>org.eclipse.jetty</groupId>
            <artifactId>jetty-webapp</artifactId>
            <version>8.0.0.M2</version>
        </dependency>

        <dependency>
            <groupId>org.eclipse.jetty</groupId>
            <artifactId>jetty-servlet</artifactId>
            <version>8.0.0.M2</version>
        </dependency>

        <dependency>
            <groupId>org.eclipse.jetty</groupId>
            <artifactId>jetty-util</artifactId>
            <version>8.0.0.M2</version>
        </dependency>

        <dependency>
            <groupId>org.eclipse.jetty</groupId>
            <artifactId>jetty-jmx</artifactId>
            <version>8.0.0.M2</version>
        </dependency>

        <dependency>
            <groupId>org.mortbay.jetty</groupId>
            <artifactId>jsp-2.1-glassfish</artifactId>
            <version>2.1.v20100127</version>
        </dependency>

And Shade plugin configuration:

            <plugin>
              <groupId>org.apache.maven.plugins</groupId>
              <artifactId>maven-shade-plugin</artifactId>
              <version>1.4</version>
            <executions>
              <execution>
                <phase>package</phase>
                <goals>
                  <goal>shade</goal>
                </goals>
                <configuration>
                  <artifactSet>
                    <includes>
                      <include>org.eclipse.jetty:*</include>
                      <include>org.mortbay.jetty:*</include>
                      <include>net.sourceforge.jtds:jtds</include>
                      <include>org.slf4j:*</include>
                      <include>log4j:*</include>
                      <include>c3p0:c3p0</include>
                    </includes>
                  </artifactSet>
                  <transformers>
                    <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                      <manifestEntries>
                        <Main-Class>org.eclipse.jetty.start.Main</Main-Class>
                        <Build-Number>123</Build-Number>
                      </manifestEntries>
                    </transformer>
                  </transformers>
                </configuration>
              </execution>
            </executions>
            </plugin>

And as output you should get nice, executable WAR web application, that is ready to be launched as easy as:

java -jar myexecutable.war jetty.xml

Of course it is good idea to externalize logging or jetty configuration in separate jetty.xml file, so you can change it without creating new deployment.
It can be as simple as:

<?xml version="1.0"?>
<!DOCTYPE Configure PUBLIC "-//Mort Bay Consulting//DTD Configure//EN" "http://jetty.mortbay.org/configure.dtd">
<Configure id="FileServer" class="org.eclipse.jetty.server.Server">

    <Call name="addConnector">
      <Arg>
          <New class="org.eclipse.jetty.server.nio.SelectChannelConnector">
            <Set name="port">8080</Set>
            <Set name="Host">localhost</Set>
          </New>
      </Arg>
    </Call>

    <Set name="handler">
      <New class="org.eclipse.jetty.server.handler.HandlerList">
        <Set name="handlers">
          <Array type="org.eclipse.jetty.server.Handler">
            <Item>
              <New class="org.eclipse.jetty.webapp.WebAppContext">
                <Set name="contextPath">/myexecutable</Set>
                <Set name="war">myexecutable.war</Set>
              </New>
            </Item>
          </Array>
        </Set>
      </New>
    </Set>

  <New id="onewalletDS" class="org.eclipse.jetty.plus.jndi.Resource">
    <Arg>myDS</Arg>
    <Arg>
      <New class="com.mchange.v2.c3p0.ComboPooledDataSource">
         <Set name="driverClass">net.sourceforge.jtds.jdbcx.JtdsDataSource</Set>
         <Set name="user">user</Set>
         <Set name="password">password</Set>
         <Set name="jdbcUrl">jdbc:jtds:sqlserver://localhost/myds</Set>
     </New>
    </Arg>
  </New>

</Configure>