BAEL-4148: Demo app for spring boot and Docker

docker/docker-spring-boot/src/main/docker/Dockerfile

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+# To build, run the following command from the top level project directory:
+#
+# docker build -f src/main/docker/Dockerfile .
+
+FROM adoptopenjdk:11-jre-hotspot as builder
+ARG JAR_FILE=target/*.jar
+COPY ${JAR_FILE} application.jar
+RUN java -Djarmode=layertools -jar application.jar extract
+
+FROM adoptopenjdk:11-jre-hotspot
+COPY --from=builder dependencies/ ./
+COPY --from=builder snapshot-dependencies/ ./
+COPY --from=builder spring-boot-loader/ ./
+COPY --from=builder application/ ./
+ENTRYPOINT ["java", "org.springframework.boot.loader.JarLauncher"]

docker/docker-spring-boot/src/main/java/com/baeldung/docker/DemoApplication.java

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

docker/docker-spring-boot/src/main/java/com/baeldung/docker/HelloController.java

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+package com.baeldung.docker;
+
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+public class HelloController {
+
+    @GetMapping("/hello")
+    public ResponseEntity<String> hello()
+    {
+        return ResponseEntity.ok("hello2    ");
+    }
+
+}

docker/docker-spring-boot/src/main/resources/application.properties

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+