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,
No Comments