# Codehaus Cargo : Application Classpath

Created by S. Ali Tokmen, last modified on Jan 28, 2021

### Definition

How to configure the classpath of the application without changing the container's own classpath

This feature is only available for local containers

This feature is not available on all containers! Currently, the only containers that support shared classpaths are:

- JBoss 5.x to 6.1.x (inclusive)
- All JBoss 7.x containers and all WildFly containers; by modifying your application's `MANIFEST.MF` file (read more on the how to put an external file in the classpath article from the JBoss website)
- Jetty 6.x and onwards
- All Tomcat containers

On other containers, please change the container classpath instead.

### Explanation

This topic is not about the classpath requirements to run Cargo (see the Installation page for this); it's about configuring the classpath for the application being executed on a container.

Some environments may require you to add some libraries to your application, without exposing them to the server itself. This concept is called a Shared Classpath.

### Example using the Java API

Starting a WAR on Tomcat 6.x with some additional classpath entries:

    LocalConfiguration configuration = new Tomcat6xStandaloneLocalConfiguration("target/tomcat6x");
    Deployable war = new WAR("target/war/grails-example-without-libs.war");
    configuration.addDeployable(war);

    InstalledLocalContainer container = new Tomcat6xInstalledLocalContainer(configuration);
    container.setHome("/srv/tomcat/catalina-home");

    List<String> jars = new List<String>();
    for (File jar : new File("/opt/grails").listFiles())
    {
        if (jar.isFile())
        {
            jars.add(jar.getAbsolutePath());
        }
    }

    container.setSharedClasspath(jars.toArray());

    container.start();

### Example using the Ant tasks

Starting a WAR on Tomcat 6.x with some additional classpath entries:

    <cargo containerId="tomcat6x" home="/srv/tomcat/catalina-home" action="start">
      <sharedClasspath>
        <fileset dir="/opt/grails">
          <include name="*.jar"/>
        </fileset>
      </sharedClasspath>
      <configuration home="target/tomcat6x">
        <deployable type="war" file="target/war/grails-example-without-libs.war"/>
      </configuration>
    </cargo>

### Example using the Maven 3 Plugin

Configuring a Tomcat 6.x container with a `com.foo` `bar-api-1.0.jar` dependency provided using the shared classpath:

    [...]
    <dependencies>
      <dependency>
        <groupId>com.foo</groupId>
        <artifactId>bar-api</artifactId>
        <scope>provided</scope>
        <version>1.0</version>
      </dependency>
    </dependencies>
    [...]
    <plugin>
      <groupId>org.codehaus.cargo</groupId>
      <artifactId>cargo-maven3-plugin</artifactId>
      <configuration>
        <container>
          <containerId>tomcat6x</containerId>
          [...]
          <dependencies>
            <dependency>
              <groupId>com.foo</groupId>
              <artifactId>bar-api</artifactId>
              <classpath>shared</classpath>
            </dependency>
          </dependencies>
        </container>
        [...]
      </configuration>
    </plugin>