Create a Maven project custom-extension having the structure as below:

Edit pom.xml:

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">

    <modelVersion>4.0.0</modelVersion>

    <groupId>org.exoplatform.samples</groupId>

    <artifactId>custom-extension</artifactId>

    <version>5.0.x</version>

    <packaging>war</packaging>

    <name>custom-extension-pom</name>

    <description>The sample extension</description>



    <properties>

        <project.version>5.0.x</project.version>

        <exoplatform.version>5.0.0</exoplatform.version>

    </properties>



    <dependencyManagement>

        <dependencies>

            <dependency>

                <groupId>org.exoplatform.platform</groupId>

                <artifactId>platform</artifactId>

                <version>${exoplatform.version}</version>

                <type>pom</type>

                <scope>import</scope>

            </dependency>

        </dependencies>

    </dependencyManagement>

</project>

Note that in this file you define the file name of the webapp. It will be custom-extension.war. You can change it here but you will have to change other configuration accordingly.

Edit WEB-INF/web.xml:

<?xml version="1.0" encoding="UTF-8"?>

<web-app>

    <display-name>custom-extension</display-name>

    <listener>

        <listener-class>org.exoplatform.container.web.PortalContainerConfigOwner</listener-class>

    </listener>

</web-app>

Edit WEB-INF/conf/configuration.xml:

<?xml version="1.0" encoding="UTF-8"?>

<configuration xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 

    xsi:schemaLocation="http://www.exoplatform.org/xml/ns/kernel_1_2.xsd http://www.exoplatform.org/xml/ns/kernel_1_2.xsd"

    xmlns="http://www.exoplatform.org/xml/ns/kernel_1_2.xsd">

</configuration>

This file is supposed to be a service configuration file, but you do not configure anything so far. In the examples that follow and in some later tutorials of the Developer guide, you will write more configuration when necessary.

Edit META-INF/exo-conf/configuration.xml:

<?xml version="1.0" encoding="UTF-8"?>

<configuration xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.exoplatform.org/xml/ns/kernel_1_2.xsd http://www.exoplatform.org/xml/ns/kernel_1_2.xsd"

  xmlns="http://www.exoplatform.org/xml/ns/kernel_1_2.xsd">



  <external-component-plugins>

    <target-component>org.exoplatform.container.definition.PortalContainerConfig</target-component>

    <component-plugin>

      <name>Change PortalContainer Definitions</name>

      <set-method>registerChangePlugin</set-method>

      <type>org.exoplatform.container.definition.PortalContainerDefinitionChangePlugin</type>

      <priority>101</priority>

      <init-params>

        <value-param>

          <name>apply.default</name>

          <value>true</value>

        </value-param>

        <object-param>

          <name>change</name>

          <object type="org.exoplatform.container.definition.PortalContainerDefinitionChange$AddDependencies">

            <field name="dependencies">

              <collection type="java.util.ArrayList">

                <value>

                  <string>custom-extension</string>

                </value>

              </collection>

            </field>

          </object>

        </object-param>     

      </init-params>

    </component-plugin>

  </external-component-plugins>



</configuration>

Build the project with mvn clean install command. You will have a war named custom-extension.warin /target/ folder.

Copy custom-extension.war to the $PLATFORM_TOMCAT_HOME/webapps/ directory.

Restart the server.

Add new WEB-INF/jboss-deployment-structure.xml file to custom-extension.war with the following content:

<jboss-deployment-structure xmlns="urn:jboss:deployment-structure:1.2">

    <deployment>

        <dependencies>

            <module name="deployment.platform.ear" export="true"/>

        </dependencies>

    </deployment>

</jboss-deployment-structure>

Add custom-extension.war to $PLATFORM_JBOSS_HOME/standalone/deployments/ platform.ear directory.

Restart the server.