first commit

Author: bzdgn

.gitignore

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+bin
+target
+.classpath
+.project
+.settings
+src/main/webapp/META-INF
+.idea
+*.iml

Dockerfile

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+# Use an official OpenJDK runtime as a parent image
+FROM openjdk:8-jre-alpine
+
+# set shell to bash
+# source: https://stackoverflow.com/a/40944512/3128926
+RUN apk update && apk add bash
+
+# Set the working directory to /app
+WORKDIR /app
+
+# Copy the fat jar into the container at /app
+COPY /target/docker-java-app-example.jar /app
+
+# Make port 8080 available to the world outside this container
+EXPOSE 8080
+
+# Run jar file when the container launches
+CMD ["java", "-jar", "docker-java-app-example.jar"]

README.md

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+
+1- Maven install to create the fat jar
+
+mvn clean install
+
+2- Docker build
+
+docker build --tag=docker-java-hello-world-app .
+
+3- Docker run
+
+docker run -p 80:8080 docker-java-hello-world-app
+
+4- Test the app
+
+http://localhost/docker-java-app/test
+
+5- Get the container id
+
+docker container ls
+
+6- Get into the app
+
+docker exec -it <container_id> /bin/bash
+
+7- To stop the container
+
+docker container stop <container_id>

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.levo.dockerexample</groupId>
+    <artifactId>docker-java-app-example</artifactId>
+    <packaging>jar</packaging>
+    <version>1.0-SNAPSHOT</version>
+    <name>docker-java-app-example</name>
+    <url>http://maven.apache.org</url>
+
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
+        <java.version>1.8</java.version>
+        <start-class>com.levo.dockerexample.DockerApp</start-class>
+    </properties>
+
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>2.1.1.RELEASE</version>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+    </dependencies>
+
+    <build>
+    	<finalName>docker-java-app-example</finalName>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>

src/main/java/com/levo/dockerexample/DockerApp.java

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+package com.levo.dockerexample;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class DockerApp {
+	public static void main(String[] args) {
+		SpringApplication.run(DockerApp.class, args);
+	}
+}

src/main/java/com/levo/dockerexample/controller/HelloController.java

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+package com.levo.dockerexample.controller;
+
+import java.util.Date;
+
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("docker-java-app")
+public class HelloController {
+	
+	@RequestMapping(value = "/test", method = RequestMethod.GET)
+	public String test() {
+		return "docker-java-app is up and running: " + new Date();
+	}
+
+}

src/test/java/com/levo/dockerexample/Test.java

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+package com.levo.dockerexample;
+
+public class Test {
+
+}