Executable war file that starts jetty without maven

Question

I'm trying to make an "executable" war file (java -jar myWarFile.war) that will start up a jetty webserver that hosts the webapp contained in the war file I executed.

I found a page that described how to make what I'm looking for:

http://eclipsesource.com/blogs/2009/10/02/executable-wars-with-jetty/

however, following that advice along with how I think I'm supposed to make an executable jar (war) isn't working.

I have an ant task creating a war with a manifest that looks like:

Manifest-Version: 1.0
Ant-Version: Apache Ant 1.7.1
Created-By: 1.5.0_18-b02 (Sun Microsystems Inc.)
Main-Class: Start

The contents of the war look like:

> Start.class
> jsp
>   build.jsp 
> META-INF  
>   MANIFEST.MF
> WEB-INF
>   lib
>     jetty-6.1.22.jar
>     jetty-util.6.1.22.jar

When I try to execute the .war file, the error is:

Exception in thread "main" java.lang.NoClassDefFoundError: org/mortbay/jetty/Handler
Caused by: java.lang.ClassNotFoundException: org.mortbay.jetty.Handler
        at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
Could not find the main class: Start. Program will exit.

There appears to be two errors here, one where it seems the jar files can't be found and one where the Start.class can't be found.

To fix the first one, I put the jetty .jar files in the base of the war and tried again, same error. I also tried adding the WEB-INF/lib/ to the Class-path attribute of the manifest. That did not work either.

Does anyone have any insight as to what I'm doing right/wrong and how I can get this executable war up and running?

Answer 1

• Putting .jars inside a .war file root does nothing
• Putting .jars inside WEB-INF/lib doesn't help the JVM find the Jetty files to even begin launching your .war. It's "too late" to put them there.
• Putting .jars in the manifest Class-Path only works for external .jar files, not those contained in the .jar

So what to do?

• Use a build script to simply merge all the .jar files you need into the .war file. This takes a little extra work. It's also a bit ugly in that the compiled code is part of the servable files in the .war
• Add dependent .jars to the JVM's classpath with "java -cp jetty.jar:... ..." Works though this kind of defeats the purpose of one stand-alone .war

Answer 2

I have done a similar thing before but are you launchign the app as "java -jar xxx.war" ?. You have only 2 jars and it is not going to be enough I think. Also try using Jetty 7.0.0M1 (which is the latest version). When I added jetty-server and jetty-webapp as two dependencies (they are from org.eclipse.jetty) I get the following jar's in the lib directory. FYI the org.mortbay.jetty.Handler was in the jetty-server*.jar.

• jetty-continuation-7.0.0.M1.jar
• jetty-http-7.0.0.M1.jar
• jetty-io-7.0.0.M1.jar
• jetty-security-7.0.0.M1.jar
• jetty-server-7.0.0.M1.jar
• jetty-servlet-7.0.0.M1.jar
• jetty-util-7.0.0.M1.jar
• jetty-webapp-7.0.0.M1.jar
• jetty-xml-7.0.0.M1.jar

Answer 3

Hudson solves this exact problem using the Winstone servlet container, which supports this use case directly. http://winstone.sourceforge.net/#embedding

Perhaps this would work for you?

Answer 4

This is my example ANT extract. The idea is to unpackage the Jetty dependencies and then include them locally just like a normal JAR file:

<!-- Hack: Java doesn't support jars within jars/wars -->
<unjar src="${lib.dir}/container/jetty.jar" dest="${build.dir}/unjar"/>
<unjar src="${lib.dir}/container/jetty-util.jar" dest="${build.dir}/unjar"/>
<unjar src="${lib.dir}/container/servlet-api.jar" dest="${build.dir}/unjar"/>
<unjar src="${lib.dir}/container/jsp-api.jar" dest="${build.dir}/unjar"/>

<!-- Build war file as normal, just including the compiled and unjar'ed files -->
<war destfile="${war.file}" webxml="${config.dir}/web.xml">
    <fileset dir="${build.dir}/classes"/>
    <fileset dir="${build.dir}/unjar"/>
    <fileset dir="${resources.dir}" excludes="*.swp"/>
    <lib dir="${lib.dir}/runtime"/>
    <manifest>
        <attribute name="Main-Class" value="Start"/>
    </manifest>
</war>

Note:

The WEB-INF/lib direcory is for the web applications dependencies. In this case we're packaging the WAR file so that it works like the normal Jetty JAR file on startup

Answer 5

The link you have in your question provides most of what you need. However, there are a few things that need to be done in addition to that.

Any class files that Jetty needs to start up will need to be located at the root of the war file when it's packaged. We can leverage Ant to do that for us before we <war> the file. The war's manifest file will also need a Main-Class attribute to execute the server.

Here's a step-by-step:

Create your Jetty server class:

This is adapted from the link you provided.

package com.mycompany.myapp;

import java.net.URL;
import java.security.ProtectionDomain;

import org.mortbay.jetty.Server;
import org.mortbay.jetty.webapp.WebAppContext;

public final class EmbeddedJettyServer
{
    public static void main(String[] args) throws Exception
    {
        int port = Integer.parseInt(System.getProperty("port", "8080"));
        Server server = new Server(port);

        ProtectionDomain domain = EmbeddedJettyServer.class.getProtectionDomain();
        URL location = domain.getCodeSource().getLocation();

        WebAppContext webapp = new WebAppContext();
        webapp.setContextPath("/");
        webapp.setDescriptor(location.toExternalForm() + "/WEB-INF/web.xml");
        webapp.setServer(server);
        webapp.setWar(location.toExternalForm());

        server.setHandler(webapp);
        server.start();
        server.join();
    }
}

Build the war with Ant:

This uses a staging directory to unpack the necessary class files into the root of the war so they're accessible when the war is executed.

<target name="war" description="--> Creates self-executing war">
  <property name="staging.dir" location="${basedir}/staging"/>
  <property name="webapp.dir" location="${basedir}/src/webapp"/>

  <mkdir dir="${staging.dir}"/>

  <!-- assumes you have all of your war content (excluding classes and libraries) already structured in a directory called src/webapp -->
  <!-- e.g. -->
  <!-- src/webapp/index.html -->
  <!-- src/webapp/WEB-INF/web.xml -->
  <!-- src/webapp/WEB-INF/classes/my.properties -->
  <!-- etc ... -->
  <copy todir="${staging.dir}">
    <fileset dir="${webapp.dir}" includes="**/*"/>
  </copy>

  <unjar dest="${staging.dir}">
    <!-- you'll have to locate these jars or appropriate versions; note that these include JSP support -->
    <!-- you might find some of them in the downloaded Jetty .tgz -->
    <fileset dir="path/to/jetty/jars">
      <include name="ant-1.6.5.jar"/>
      <include name="core-3.1.1.jar"/>
      <include name="jetty-6.1.24.jar"/>
      <include name="jsp-2.1-glassfish-2.1.v20091210.jar"/><!-- your JSP implementation may vary -->
      <include name="jsp-api-2.1-glassfish-2.1.v20091210.jar"/><!-- your JSP implementation may vary -->
      <include name="servlet-api-2.5-20081211.jar"/><!-- your Servlet API implementation may vary -->
    </fileset>
    <patternset><!-- to exclude some of the stuff we don't really need -->
      <exclude name="META-INF/**/*"/>
      <exclude name="images/**/*"/>
      <exclude name=".options"/>
      <exclude name="about.html"/>
      <exclude name="jdtCompilerAdapter.jar"/>
      <exclude name="plugin*"/>
    </patternset>
  </unjar>

  <!-- copy in the class file built from the above EmbeddedJettyServer.java -->
  <copy todir="${staging.dir}">
    <fileset dir="path/to/classes/dir" includes="com/mycompany/myapp/EmbeddedJettyServer.class"/>
  </copy>

  <war destfile="myapp.war" webxml=${webapp.dir}/WEB-INF/web.xml">
    <fileset dir="${staging.dir}" includes="**/*"/>
    <classes dir="path/to/classes/dir"/><!-- your application classes -->
    <lib dir="path/to/lib/dir"/><!-- application dependency jars -->
    <manifest>
      <!-- add the Main-Class attribute that will execute our server class -->
      <attribute name="Main-Class" value="com.mycompany.myapp.EmbeddedJettyServer"/>
    </manifest>
  </war>

  <delete dir="${staging.dir}"/>
</target>

Execute the war:

If everything's set up properly above, you should be able to:

java -jar myapp.war

// or if you want to configure the port (since we are using the System property in the code)

java -Dport=8443 -jar myapp.war

Answer 6

There is also ant plugin to do that

http://docs.codehaus.org/display/JETTY/Ant+Jetty+Plugin