Update Dockerfile

Author: Hasinibitla2404

Dockerfile

@@ -1,18 +1,20 @@
 # Multi-stage build setup (https://docs.docker.com/develop/develop-images/multistage-build/)
 
 # Stage 1 (to create a "build" image, ~140MB)
-FROM openjdk:11
-RUN java -version
+FROM adoptopenjdk/openjdk11:latest
+ARG MAVEN_VERSION="3.8.1"
+ARG USER_HOME_DIR="/root"
+ARG SHA="b98a1905eb554d07427b2e5509ff09bd53e2f1dd7a0afa38384968b113abef02"
+ARG BASE_URL="https://apache.osuosl.org/maven/maven-3/${MAVEN_VERSION}/binaries"
 
-COPY . /usr/src/myapp/
-WORKDIR /usr/src/myapp/
-RUN mvn --version
-RUN mvn package
+RUN mkdir -p /usr/share/maven \
+    && curl -Lso  /tmp/maven.tar.gz ${BASE_URL}/apache-maven-${MAVEN_VERSION}-bin.tar.gz \
+    && echo "${SHA}  /tmp/maven.tar.gz" | sha256sum -c - \
+    && tar -xzC /usr/share/maven --strip-components=1 -f /tmp/maven.tar.gz \
+    && rm -v /tmp/maven.tar.gz \
+    && ln -s /usr/share/maven/bin/mvn /usr/bin/mvn
 
-# Stage 2 (to create a downsized "container executable", ~87MB)
-FROM openjdk:8-jre-alpine3.7
-WORKDIR /root/
-COPY --from=builder /usr/src/myapp/target/app.jar .
+ENV MAVEN_HOME /usr/share/maven
+ENV MAVEN_CONFIG "${USER_HOME_DIR}/.m2"
 
-EXPOSE 8123
-ENTRYPOINT ["java", "-jar", "./app.jar"]
+CMD ["/usr/bin/mvn"]