Chapter 5 Docker edits

Author: dpw67

5-reactive/Dockerfile

@@ -0,0 +1,14 @@
+FROM adoptopenjdk/openjdk8:latest as builder
+WORKDIR application
+ARG JAR_FILE=target/*.jar
+COPY ${JAR_FILE} application.jar
+RUN java -Djarmode=layertools -jar application.jar extract
+
+FROM adoptopenjdk/openjdk8:latest
+WORKDIR application
+COPY --from=builder application/dependencies/ ./
+COPY --from=builder application/snapshot-dependencies/ ./
+COPY --from=builder application/resources/ ./
+COPY --from=builder application/application/ ./
+ENTRYPOINT ["java", "org.springframework.boot.loader.JarLauncher"]
+