Create a new Maven project as follows:

Edit pom.xml:

<project>

  <modelVersion>4.0.0</modelVersion>

  <groupId>com.acme.samples</groupId>

  <artifactId>hello-portlet</artifactId>

  <version>1.0</version>

  <packaging>war</packaging>

  <build>

    <finalName>hello-portlet</finalName>

  </build>



  <dependencies>

    <dependency>

      <groupId>javax.portlet</groupId>

      <artifactId>portlet-api</artifactId>

      <version>2.0</version>

      <scope>provided</scope>

    </dependency>

  </dependencies>

</project>

Edit WEB-INF/web.xml:

<web-app>

  <display-name>hello-portlet</display-name>

</web-app>

Edit WEB-INF/portlet.xml:

<portlet-app version="2.0" xmlns="http://java.sun.com/xml/ns/portlet/portlet-app_2_0.xsd"

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

  xsi:schemaLocation="http://java.sun.com/xml/ns/portlet/portlet-app_2_0.xsd http://java.sun.com/xml/ns/portlet/portlet-app_2_0.xsd">

  <portlet>

    <portlet-name>Hello</portlet-name>

    <portlet-class>com.acme.samples.HelloPortlet</portlet-class>

    <supports>

      <mime-type>text/html</mime-type>

    </supports>

    <portlet-info>

      <title>Hello</title>

    </portlet-info>

  </portlet>

</portlet-app>

Edit HelloPortlet.java:

package com.acme.samples;


import java.io.IOException;


import javax.portlet.GenericPortlet;

import javax.portlet.PortletRequestDispatcher;

import javax.portlet.RenderRequest;

import javax.portlet.RenderResponse;

import javax.portlet.PortletException;

import javax.portlet.RenderMode;


public class HelloPortlet extends GenericPortlet {

  @RenderMode(name = "view")

  public void Hello(RenderRequest request, RenderResponse response) throws IOException, PortletException {

    PortletRequestDispatcher prDispatcher = getPortletContext().getRequestDispatcher("/jsp/hello.jsp");

    prDispatcher.include(request, response);

  }

}

Edit jsp/hello.jsp:

<h2>Hello</h2>
<h6>Welcome to Hello portlet!</h6>
<p><i>Powered by eXo Platform.<i><p>