Deploying A Simple Hello World App using OpenLiberty S2I to Openshift

For this example im using OpenLiberty version 19.0.0.6, and install corresponding image to my Openshift registry using below command,

oc import-image openliberty/open-liberty-s2i:19.0.0.6

Can check our list of images on our imagestream by using this command,

oc get is

Next is creating a simple hello-world webapps, with below pom

<?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/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>hello-world-servlet</groupId>
    <artifactId>com.edw</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>war</packaging>

    <dependencies>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>4.0.1</version>
            <scope>provided</scope>
        </dependency>
    </dependencies>

    <build>
        <sourceDirectory>src/main/java</sourceDirectory>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-war-plugin</artifactId>
                <version>2.4</version>
                <configuration>
                    <failOnMissingWebXml>false</failOnMissingWebXml>
                    <webXml>src\main\webapp\WEB-INF\web.xml</webXml>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.1</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

And web.xml,

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app
        PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
        "http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
    <display-name>My Web Application</display-name>

    <servlet>
        <servlet-name>helloServlet</servlet-name>
        <servlet-class>com.edw.MyServlet</servlet-class>
    </servlet>

    <servlet-mapping>
        <servlet-name>helloServlet</servlet-name>
        <url-pattern>/hello.servlet</url-pattern>
    </servlet-mapping>

    <welcome-file-list>
        <welcome-file>/hello.jsp</welcome-file>
    </welcome-file-list>
    <session-config>
        <session-timeout>30</session-timeout>
    </session-config>
</web-app>

A simple JSP file,

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Hello World</title>
</head>
<body>
Hello World
</body>
</html>

And a simple java file,

package com.edw;

import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class MyServlet  extends HttpServlet {
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws IOException {
        response.getWriter().println("Hello");
    }
}

And a simple server.xml file,

<?xml version="1.0" encoding="UTF-8"?>
<server description="OpenLiberty Server">
    <httpEndpoint id="defaultHttpEndpoint" host="*" httpPort="9080" httpsPort="9443"/>
    <webApplication location="com.edw-1.0-SNAPSHOT.war"/>
</server>

After project is properly setup, we can do a simple mvn build,

mvn clean package

And push our application to Openshift, run below command on the root of your project location

oc new-build --name=my-openliberty-full --image-stream=open-liberty-s2i:19.0.0.6 --binary=true

oc start-build my-openliberty-full --from-dir=.

oc new-app my-openliberty-full --name=my-openliberty-full

We can access our newly created app directly thru browser,

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