无法在全新的Maven安装中运行“ MVN验证清洁-脱机”

Question

I'm working on a linux (RHEL) box not connected to the internet. I currently have the "apache-maven-3.2.3-bin.tar.gz" from the maven-apache download page .

When I run "mvn verify clean --offline" in a terminal I get the following error:

[INFO] Scanning for projects...
[INFO] 
[INFO] ------------------------------------------------------
[INFO] Building ABC 2-SNAPSHOT
[INFO] ------------------------------------------------------
[WARNING] The POM for org.apache.maven.plugins:maven-=clean-plugin:jar:2.5 
          is missing, no dependency information available
[INFO] ------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------
[INFO] ................
[INFO] ------------------------------------------------------
[ERROR] Plugin org.apache.maven.plugins:maven-clean-plugin:2.5 or one of its 
        dependencies could not be resolved: Could not find artifact 
        org.apache.maven.plugins:maven-clean-plugin:jar:2.5 -> [Help 1]
[ERROR] 
[ERROR] ................
[ERROR] 

(I'm removing extraneous info. If you want me to add the flag -X or -e ask me to do so and I'll post the results. I didn't think they'd be useful.)

I followed the instructions on the download page to configure my box for "Unix-based Operating Systems" and converted my Eclipse 3.x RCP Application to a Maven Project, which created a pom.xml.

<project xmlns="http://maven.apache.org/POM/4.0.0" 
         xmlns:xsi="http://www.w3.oirg/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>
  <groupId>data.git_repo.abc_repos</groupId>
  <artifactId>cem.abc</artifactId>
  <version>2-SNAPSHOT</version>
  <packaging>pom</packaging>
  <name>RDC</name>

  <properties>
    <tycho-version>0.21.0</tycho-version>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEnconding>
  </properties>

  <profiles>
    <profile>
      <id>abc</id>
      <activation>
        <activeByDefault>true</activeByDefault>
        <property>
          <name>offline</name>
          <value>true</value>
        </property>
      </activation
    </profile>
  </profiles>

  <repositories>
    <repository>
      <id>central</id>
      <name>abc_repo</name>
      <layout>default</layout>
      <url>file:///data/git_repos/abc_repos/cem.abc</url>
      <releases>
        <enabled>false</enabled>
        <updatePolicy>never</updatePolicy>
      </releases>
    </repository>
  </repositories>

  <pluginRepositories>
    <pluginRepository>
      <id>central</id>
      <name>abc_repo</name>
      <layout>default</layout>
      <url>file:///data/git_repos/abc_repos/cem.abc</url>
      <snapshots>
        <enabled>true</enabled>
      <snapshots>
      <releases>
        <enabled>false</enabled>
        <updatePolicy>never</updatePolicy>
      </releases>
    <pluginRepository>    
  </pluginRepositories>

  <build>
    <sourceDirectory>src</sourceDirectory>
    <resources>
      <resources>
        <directory>src<directory>
      </resources>
    <resources>

    <pluginManagement>
      <plugins>
        <plugin>
          <groupId>org.eclipse.tycho</groupId>
          <artifactId>target-platform-configuration</artifactId>
          <version>${tycho.version}</version>
        </plugin>
      </plugins>
    </pluginManagement>
  </build>
</project>

Answer 1

To work off-line with Maven, you need a local Maven repository which has all the needed artifacts. Maven automatically downloads them when you are building without the --offline switch.

If you have a machine without Internet access, you can still build your project in the following way:

1. Build the on a machine with Internet access.
2. Copy the local Maven repository ~/.m2/repository/ from the on-line machine to the off-line machine.
3. Build the project with --offline .