org.apache.maven.surefire 无法引用或无法下载问题

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问题报错：

Failure to transfer org.apache.maven.surefire:surefire:pom:2.10 from http://repo.maven.apache.org/maven2 was cached in the local repository,

resolution will not be reattempted until the update interval of central has elapsed or updates are forced. Original error: Could not transfer
artifact org.apache.maven.surefire:surefire:pom:2.10 from/to central (http://repo.maven.apache.org/maven2): java.net.ConnectException:

connection timed out to http://repo.maven.apache.org/maven2/org/apache/maven/surefire/surefire/2.10/surefire-2.10.pom

错误原因：

org.apache.maven.surefire    没有配置    和 http://repo.maven.apache.org/maven2 连接不上的问题

解决方式：

   在pom.xml文件中注意配置如下内容：

       <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-surefire-plugin</artifactId>
                <version>2.7</version>
            </plugin>
     </plugins>

   其次如果还报 connection timed out ，请再setting.xml添加仓储镜像解决，比如使用阿里云的仓储镜像速度非常快，配置如下：
<mirrors>
    <mirror>
      <id>alimaven</id>
      <name>aliyun maven</name>
      <url>http://maven.aliyun.com/nexus/content/groups/public/</url>
      <mirrorOf>central</mirrorOf>
    </mirror>
</mirrors>

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