Deploying a Java Apps and JBoss EAP into Openshift 4

Sometimes we still have to maintain an application which is still deployed on top of JBoss EAP and in a Virtual Machine, and planning in onboarding them into Openshift.

Deploying this kind of applications is almost the same as deploying a Spring Boot applications on Openshift. Only need one command for doing it.

So lets start with a basic maven file,

<?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>com.edw</groupId>
    <artifactId>HelloWorldWar</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>war</packaging>
    <dependencies>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <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>
                    <optimize>true</optimize>
                    <debug>true</debug>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-war-plugin</artifactId>
                <version>2.6</version>
                <configuration>
                    <warName>${project.name}</warName>
                    <failOnMissingWebXml>false</failOnMissingWebXml>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

Lets set the context root of this app,

<jboss-web>
    <context-root>/</context-root>
</jboss-web>

And a servlet for serving some content,

package com.edw;

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

@WebServlet(name = "HelloServlet", urlPatterns = "/")
public class HelloServlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest request,
                         HttpServletResponse response)
            throws ServletException, IOException {

        response.setContentType("text/html");

        PrintWriter out = response.getWriter();
        out.println("<h1> Hello World </h1>");

    }
}

And make sure the structure of our project is like below,

+--- .gitignore
+--- pom.xml
+--- README.md
+--- src
|   +--- main
|   |   +--- java
|   |   |   +--- com
|   |   |   |   +--- edw
|   |   |   |   |   +--- HelloServlet.java
|   |   +--- webapp
|   |   |   +--- WEB-INF
|   |   |   |   +--- jboss-web.xml

We can deploy our code to test-project namespace in our Openshift by using below command,

$ oc new-app openshift/jboss-eap73-openjdk11-openshift:latest~. \ 
	--name=hello-world -n test-project

Code for this tutorial can be seen in below Github url

https://github.com/edwin/hello-world-jboss-eap