Maven 安装错误：无法解析依赖关系

Question

我使用的是Maven 3.1.1。当我运行mvn install时，我收到以下错误：

D:\spring source>mvn install
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building SpringDependencies 1.0
[INFO] ------------------------------------------------------------------------
Downloading: http://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-
dependency-plugin/2.8/maven-dependency-plugin-2.8.pom
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 0.648s
[INFO] Finished at: Mon Dec 16 15:01:47 IST 2013
[INFO] Final Memory: 4M/15M
[INFO] ------------------------------------------------------------------------
[ERROR] Plugin org.apache.maven.plugins:maven-dependency-plugin:2.8 or one of it
s dependencies could not be resolved: Failed to read artifact descriptor for org
.apache.maven.plugins:maven-dependency-plugin:jar:2.8: Could not transfer artifa
ct org.apache.maven.plugins:maven-dependency-plugin:pom:2.8 from/to central (htt
p://repo.maven.apache.org/maven2): repo.maven.apache.org: Unknown host repo.mave
n.apache.org -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e swit
ch.
[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 rea
d the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/PluginResoluti
onException

我的< code>pom.xml是:

<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>
  <groupId>spring-source-download</groupId>
  <artifactId>SpringDependencies</artifactId>
  <version>1.0</version>
  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>
  <dependencies>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>4.0.0.RELEASE</version>
    </dependency>
  </dependencies>
  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-dependency-plugin</artifactId>
            <version>3.1.1</version>
            <executions>
              <execution>
                <id>download-dependencies</id>
                  <phase>generate-resources</phase>
                    <goals>
                      <goal>copy-dependencies</goal>
                    </goals>
                    <configuration>
                      <outputDirectory> ${project.build.directory}/dependencies </outputDirectory>
                    </configuration>
              </execution>
            </executions>
      </plugin>
    </plugins>
  </build>
</project>

Answer 1

这是由损坏的maven或插件文件夹引起的。要解决此问题，请执行以下操作：

1. 删除\. m2\repository\org\apache\maven
2. mvn依赖：解决-X

Answer 2

此错误是由于代理设置造成的。

首先，检查您是否能够连接到maven存储库(http://repo1.maven.org/maven2)从浏览器。

然后更新Maven代理设置创建/更新. m2目录中的settings.xml，详细信息如下:

 <proxies>
    <proxy>
      <active>true</active>
      <protocol>http</protocol>
      <host>{your proxy server host name}</host>
      <port>{your proxy server port}</port>
      <nonProxyHosts>maven</nonProxyHosts>
    </proxy>
  </proxies>

Maven 社区给出的解决方案：http://maven.apache.org/guides/mini/guide-proxies.html

Answer 3

无法将工件组织从/传输到中心 （http://repo.maven.apache.org/maven2）： repo.maven.apache.org： 未知主机 repo.maven.apache.org

您的maven似乎无法访问远程中央存储库。

• 检查您是否已建立Internet连接。
• 检查是否可以在浏览器中访问默认的maven存储库http://repo.maven.apache.org/maven2。
• 检查中是否有正确的配置