Java 4293 update dockerizing spring boot app article (#10512)

* JAVA-4293 Fix Dockerize Spring Boot article

* JAVA-4293 Remove authentication / fix pom file

Co-authored-by: mikr <michael.krimgen@ximedes.com>

spring-cloud/spring-cloud-docker/docker-message-server/Dockerfile

@@ -0,0 +1,4 @@
+FROM openjdk:8-jdk-alpine
+MAINTAINER baeldung.com
+COPY target/docker-message-server-1.0.0.jar message-server.jar
+ENTRYPOINT ["java","-jar","/message-server.jar"]

spring-cloud/spring-cloud-docker/docker-message-server/pom.xml

@@ -0,0 +1,55 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xmlns="http://maven.apache.org/POM/4.0.0"
+    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>
+    <artifactId>docker-message-server</artifactId>
+    <name>docker-message-server</name>
+    <version>1.0.0</version>
+
+    <parent>
+        <groupId>com.baeldung.spring.cloud</groupId>
+        <artifactId>spring-cloud-docker</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.vintage</groupId>
+            <artifactId>junit-vintage-engine</artifactId>
+            <scope>test</scope>
+            <exclusions>
+                <exclusion>
+                    <groupId>org.hamcrest</groupId>
+                    <artifactId>hamcrest-core</artifactId>
+                </exclusion>
+            </exclusions>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <goals>
+                            <goal>repackage</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+</project>

spring-cloud/spring-cloud-docker/docker-message-server/src/main/java/com/baeldung/spring/cloud/config/docker/DockerMessageController.java

@@ -0,0 +1,12 @@
+package com.baeldung.spring.cloud.config.docker;
+
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+public class DockerMessageController {
+    @GetMapping("/messages")
+    public String getMessage() {
+        return "Hello from Docker!";
+    }
+}

spring-cloud/spring-cloud-docker/docker-message-server/src/main/java/com/baeldung/spring/cloud/config/docker/DockerServer.java

@@ -0,0 +1,11 @@
+package com.baeldung.spring.cloud.config.docker;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class DockerServer {
+    public static void main(String[] args) {
+        SpringApplication.run(DockerServer.class, args);
+    }
+}

spring-cloud/spring-cloud-docker/docker-message-server/src/main/resources/application.properties

@@ -0,0 +1,3 @@
+server.port=8888
+spring.security.user.name=root
+spring.security.user.password=docker!