如何在开发环境中使用maven-docker以避免重复下载jar？
这是我的Dockerfile，但是如果我改了java代码，然后input“docker-compose up -d –build”到terminal，maven会重新下载jar，如何避免重复下载？
Dockerfile：
FROM maven:3.5.0-jdk-8 WORKDIR /app COPY pom.xml . COPY src ./src RUN mvn verify ENTRYPOINT ["java","-jar","target/cloud-user.jar"] 泊坞窗，compose.yml：
version: "2" services: cloud-nginx: build: cloud-nginx image: registry.cn-beijing.aliyuncs.com/wangdali/cloud-nginx restart: always ports: ["80:80"] cloud-consul: image: consul:0.9.2 command: consul agent -dev -client 0.0.0.0 cloud-front: build: cloud-front image: registry.cn-beijing.aliyuncs.com/wangdali/cloud-front restart: always volumes: - ./cloud-front/static:/app cloud-user: build: cloud-user image: registry.cn-beijing.aliyuncs.com/wangdali/cloud-user restart: always mysql: image: mysql:5.7.19 hostname: mysql volumes: - ./docker/mysql/data:/var/lib/mysql - ./docker/mysql/conf:/etc/mysql/conf.d - /etc/localtime:/etc/localtime ulimits: nproc: 65535 mem_limit: 1024m restart: always environment: MYSQL_ROOT_PASSWORD: root ports: - "3306:3306"
我简化了我的testing项目，然后使用maven的spring-boot插件
mvn spring-boot：运行
启动项目，现在先挂载.m2文件夹，然后运行mvn命令。 但是当我更改了java源代码后，它不会自动加载devtools，怎么解决？
这是我的Dockerfile / docker-compose.yml：
Dockerfile：
version: "2" services: user: build: user volumes: - $HOME/.m2/repository:/root/.m2/repository - ./user/src:/app/src ports: - "8080:8080"
泊坞窗，compose.yml：
FROM maven:3.5.0-jdk-8 WORKDIR /app COPY pom.xml . COPY src ./src ENTRYPOINT ["mvn","spring-boot:run"]
解决了，我将目标文件夹挂载到容器，它可以自动加载，这是最终的dockerfile和docker-compose.yml，当然在生产环境中我们不能写：
Dockerfile：
FROM maven:3.5.0-jdk-8 WORKDIR /app COPY pom.xml . COPY src ./src ENTRYPOINT ["mvn","spring-boot:run"]
泊坞窗，compose.yml
version: "2" services: user: build: user volumes: - $HOME/.m2/repository:/root/.m2/repository - ./user/target:/app/target ports: - "8080:8080" - "5005:5005"
pom.xml中：
<plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> <configuration> <mainClass>cn.codeforfun.Application</mainClass> <jvmArguments>-agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=5005</jvmArguments> </configuration> </plugin> </plugins>