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/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!