在 docker 容器内构建 maven 项目

Question

I'm having some problems while trying to build a mvn project inside a Docker container. Everytime I try to build using the following Dockerfile, I get this error:

[10/10] COPY target/*.jar app.jar:
------
lstat /var/lib/docker/tmp/buildkit-mount9100795/target: no such file or directory

My current Dockerfile:

FROM maven:3.8.1-openjdk-17 as builder
COPY src /tmp/src/
COPY pom.xml /tmp/
WORKDIR /tmp/
RUN mvn clean install


FROM maven:3.8.1-openjdk-17
WORKDIR /tmp/app
COPY target/*.jar app.jar
EXPOSE 8081
ENTRYPOINT ["java","-jar","app.jar"]

Answer 1

I've found the correct configurations for the dockerfile and relative paths. Since I've set the WORKDIR for the buider as /tmp/ my target folder was being generated at /tmp/target/ , so specifying the source files with the ---from=builder tag, and updating the path, I was able to succesfully copy the .jar file

My current working dockerfile:

FROM maven:3.8.1-openjdk-17 as builder
COPY src /tmp/src/
COPY pom.xml /tmp/
WORKDIR /tmp/
RUN mvn clean install


FROM maven:3.8.1-openjdk-17
COPY --from=builder /tmp/target/*.jar app.jar
EXPOSE 8081
ENTRYPOINT ["java","-jar","app.jar"]