Pushing Java Program - Hello World

.dockerignore

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+target
+.ufo

.gitignore

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+pkg
+target
+*.class
+.ufo/current
+.ufo/data
+.ufo/log
+.ufo/output

POM.xml

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+<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>com.domain</groupId>
+  <artifactId>demo</artifactId>
+  <packaging>war</packaging>
+  <version>1.0-SNAPSHOT</version>
+  <name>Demo Maven Webapp</name>
+  <url>https://github.com/tongueroo/demo-java</url>
+  <build>
+    <finalName>demo</finalName>
+    <sourceDirectory>src</sourceDirectory>
+    <plugins>
+      <plugin>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <version>3.7.0</version>
+        <configuration>
+          <source>1.8</source>
+          <target>1.8</target>
+        </configuration>
+      </plugin>
+      <plugin>
+        <artifactId>maven-war-plugin</artifactId>
+        <version>3.0.0</version>
+      </plugin>
+    </plugins>
+  </build>
+  <dependencies>
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <version>3.8.1</version>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>log4j</groupId>
+      <artifactId>log4j</artifactId>
+      <version>1.2.17</version>
+    </dependency>
+    <dependency>
+        <groupId>javax.servlet</groupId>
+        <artifactId>javax.servlet-api</artifactId>
+        <version>3.1.0</version>
+    </dependency>
+  </dependencies>
+</project>

README.md

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+# Demo Java Web App
+
+[![BoltOps Badge](https://img.boltops.com/boltops/badges/boltops-badge.png)](https://www.boltops.com)
+
+Simple java project demos how to build a war file to be deployed on a Tomcat server.
+
+## Build

bin/build

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+#!/bin/bash -exu
+
+# brew install maven # for macosx
+mvn package
+# move the artifact into pkg so we do not have to send the whole target file
+# to the docker build context. We will dockerignore target.
+mvn package # creates target/demo.war
+# Move the artifact into pkg so we do not have to send the whole target file
+# to the docker build context. We will dockerignore target because it contains
+# other build files that bloats the upload context sent to docker.
+mkdir -p pkg
+mv target/demo.war pkg/demo.war

dockerfile

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+FROM tomcat:8.5
+MAINTAINER Tung Nguyen <tongueroo@gmail.com>
+
+# Debugging tools: A few ways to handle debugging tools.
+# Trade off is a slightly more complex volume mount vs keeping the image size down.
+RUN apt-get update && \
+  apt-get install -y \
+    net-tools \
+    tree \
+    vim && \
+  rm -rf /var/lib/apt/lists/* && apt-get clean && apt-get purge
+
+RUN echo "export JAVA_OPTS=\"-Dapp.env=staging\"" > /usr/local/tomcat/bin/setenv.sh
+COPY pkg/demo.war /usr/local/tomcat/webapps/demo.war
+
+EXPOSE 8080
+CMD ["catalina.sh", "run"]

src/main/java/Hello.java

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+// Import required java libraries
+import java.io.*;
+import javax.servlet.*;
+import javax.servlet.http.*;
+
+// Extend HttpServlet class
+public class Hello extends HttpServlet {
+
+   private String message;
+
+   public void init() throws ServletException {
+      // Do required initialization
+      message = "Hello World: src/main/java/Hello.java";
+   }
+
+   public void doGet(HttpServletRequest request, HttpServletResponse response)
+      throws ServletException, IOException {
+
+      // Set response content type
+      response.setContentType("text/html");
+
+      // Actual logic goes here.
+      PrintWriter out = response.getWriter();
+      out.println("<h1>" + message + "</h1>");
+   }
+}

src/main/webapp/WEB-INF/web.xml

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+<!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>demo java web app</display-name>
+  <welcome-file-list>
+    <welcome-file>index.html</welcome-file>
+    <welcome-file>index.htm</welcome-file>
+    <welcome-file>index.jsp</welcome-file>
+    <welcome-file>default.html</welcome-file>
+    <welcome-file>default.htm</welcome-file>
+    <welcome-file>default.jsp</welcome-file>
+  </welcome-file-list>
+
+  <servlet>
+     <servlet-name>Hello</servlet-name>
+     <servlet-class>Hello</servlet-class>
+  </servlet>
+  <servlet-mapping>
+     <servlet-name>Hello</servlet-name>
+     <url-pattern>/Hello</url-pattern>
+  </servlet-mapping>
+
+</web-app>

src/main/webapp/index.jsp

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+<html>
+<body>
+<h2>Hello World: src/main/webapp/index.jsp</h2>
+</body>
+</html>