Unable to build docker image in one step

[mark-sivill-kong]

Hi,

The current docker file requires a maven build to occur first, which requires a user to set up Java and Maven on their local machine.

By using Docker multi-stage builds https://docs.docker.com/build/building/multi-stage/ the requirement for a local Java and Maven setup can be removed.

Below is an example of how this can be done.

Thanks

Mark

#
# mark-sivill-kong - Dec 2022
# 
FROM openjdk:8-jdk-alpine

WORKDIR /swagger-petstore

RUN apk add maven

COPY src/ /swagger-petstore/src
COPY pom.xml /swagger-petstore/pom.xml

RUN mvn --quiet package

#
# copy build assets into run
#
FROM openjdk:8-jre-alpine

WORKDIR /swagger-petstore

COPY src/main/resources/openapi.yaml /swagger-petstore/openapi.yaml
COPY inflector.yaml /swagger-petstore/
COPY --from=0 /swagger-petstore/target/lib/jetty-runner.jar /swagger-petstore/jetty-runner.jar
COPY --from=0 /swagger-petstore/target/*.war /swagger-petstore/server.war

EXPOSE 8080

CMD ["java", "-jar", "-DswaggerUrl=openapi.yaml", "/swagger-petstore/jetty-runner.jar", "--log", "/var/log/yyyy_mm_dd-requests.log", "/swagger-petstore/server.war"]