Question

我正在尝试从DockerFile构建Docker映像，但不断出现错误，例如找不到父pom.xml在Docker文件中执行maven命令并构建项目。我一直在环顾四周，您会看到人们在做的事就是给孩子pom.xml添加对父pom.xml的引用y尝试向孩子添加relativePath>.. /pom.xml/relativePath>但仍然无法正常工作。

Maven多模块项目

[ project structure[1]

DockerFile

FROM alpine/git as clone
WORKDIR /app
RUN git clone https://github.com/RicardoVargasLeslie/manager.git

FROM openjdk:8-jdk-alpine as build
WORKDIR /workspace/app

COPY mvnw .
COPY .mvn .mvn
COPY pom.xml .
COPY src src

RUN ./mvnw install -DskipTests

ENTRYPOINT ["java","-jar","/Web-0.0.1-SNAPSHOT.jar"]

Child-pom.xml（Web）

<project xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>com.imricki.manager</groupId>
        <artifactId>core</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <relativePath>../pom.xml</relativePath>
    </parent>
    <artifactId>Web</artifactId>
    <name>Web</name>
    <description>Web Module</description>

Parent-pom.xml（Core）

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.6.RELEASE</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.imricki.manager</groupId>
    <artifactId>core</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>Core</name>
    <description>Core Module</description>
    <packaging>pom</packaging>

Docker comand构建映像

docker build -t rest-api .

命令行跟踪

$ docker build -t rest-api .
Sending build context to Docker daemon  42.92MB
Step 1/11 : FROM alpine/git as clone
 ---> a1d22e4b51ad
Step 2/11 : WORKDIR /app
 ---> Using cache
 ---> e53f5b4941b5
Step 3/11 : RUN git clone https://github.com/RicardoVargasLeslie/manager.git
 ---> Using cache
 ---> 490b2afea22c
Step 4/11 : FROM openjdk:8-jdk-alpine as build
 ---> a3562aa0b991
Step 5/11 : WORKDIR /workspace/app
 ---> Using cache
 ---> 0b7c106319e9
Step 6/11 : COPY mvnw .
 ---> Using cache
 ---> 2c7ab0b79d25
Step 7/11 : COPY .mvn .mvn
 ---> Using cache
 ---> eb9ec36b737a
Step 8/11 : COPY pom.xml .
 ---> Using cache
 ---> 2296a5fbd6ae
Step 9/11 : COPY src src
 ---> Using cache
 ---> 022a609f4376
Step 10/11 : RUN ./mvnw install -DskipTests
 ---> Running in 897cff2e3c3b
[INFO] Scanning for projects...
[ERROR] [ERROR] Some problems were encountered while processing the POMs:
[FATAL] Non-resolvable parent POM for com.imricki.manager:Web:[unknown-version]: Could not find artifact com.imricki.manager:core:pom:0.0.1-SNAPSHOT and 'parent.relativePath' points at wrong local POM @ line 5, column 10
 @
[ERROR] The build could not read 1 project -> [Help 1]
[ERROR]
[ERROR]   The project com.imricki.manager:Web:[unknown-version] (/workspace/app/pom.xml) has 1 error
[ERROR]     Non-resolvable parent POM for com.imricki.manager:Web:[unknown-version]: Could not find artifact com.imricki.manager:core:pom:0.0.1-SNAPSHOT and 'parent.relativePath' points at wrong local POM @ line 5, column 10 -> [Help 2]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/ProjectBuildingException
[ERROR] [Help 2] http://cwiki.apache.org/confluence/display/MAVEN/UnresolvableModelException
The command '/bin/sh -c ./mvnw install -DskipTests' returned a non-zero code: 1

我不确定要执行什么工作或如何使构建正常进行，感谢您的帮助。

Answer 1

Maven是一种工具，可通过声明方式来管理项目的依赖项。它通过标准化项目共享jar和pom文件（工件）的方式并使用maven坐标声明项目依赖项（groupId，artifactId和version）来做到这一点，然后在jar和pom文件的大型公共Maven存储库中查找叫做Maven Central。

为了将jar / pom文件（例如您的核心）作为Maven工件进行管理，您需要将工件部署到Maven Central（任何人都可以访问的公共存储库）或私有存储库中的某些位置您的专用网络（或什至在Internet上，并可能带有身份验证）。对于私有存储库，您需要包括私有存储库，以便您的Maven执行不仅在Maven Central中查找工件，而且还在私有存储库中查找工件。您可以通过将以下内容添加到settings.xml文件中来实现此目的：

<!-- Authentication here -->
<servers>
  <server>
      <id>nexus</id>
      <username>some_username</username>
      <password>some_passowrd</password>
    </server>
</servers>
...
 <profiles>
    <profile>
      <id>nexus</id>
      <!--Override the repository (and pluginRepository) "central" from the
   Maven Super POM -->
      <repositories>
        <repository>
          <id>nexus-release</id>
          <name>nexus-release</name>
          <url>http://hostname_or_ip_address/content/repositories/releases</url>
        </repository>
        <repository>
          <id>nexus-thirdparty</id>
          <name>nexus-thirdparty</name>
          <url>http://hostname_or_ip_address/content/repositories/thirdparty</url>
        </repository>
      </repositories>
      <pluginRepositories>
        <pluginRepository>
          <id>nexus-plugin-release</id>
          <name>nexus-plugin-release</name>
          <url>http://hostname_or_ip_address/content/repositories/releases/</url>
        </pluginRepository>
        <pluginRepository>
          <id>nexus-plugin-third-party</id>
          <name>nexus-plugin-third-party</name>
          <url>http://hostname_or_ip_address/content/repositories/thirdparty/</url>
        </pluginRepository>
      </pluginRepositories>
    </profile>
  </profiles>
...

我注意到您的孩子pom.xml文件引用了自定义父模块。您需要确保父模块位于maven存储库（Nexus / Artifactory）中，并为settings.xml文件提供Docker容器的存储库设置，以便能够提取父pom。

Docker Build上不可解析的父POM