maven -- 問題解決（二）解決「Could not calculate build plan」問題

錯誤提示以下：（eclipse+maven）

Could not calculate build plan: Failure to transfer org.apache.maven.plugins:maven-surefire-plugin:pom:2.7.1 from http://repo1.maven.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.plugins:maven-surefire-plugin:pom:2.7.1 from/to central (http://repo1.maven.org/maven2): Access denied to http://repo1.maven.org/maven2/org/apache/maven/plugins/maven-surefire-plugin/2.7.1/maven-surefire-plugin-2.7.1.pom. Error code 407, Proxy Authentication Required ( The ISA Server requires authorization to fulfill the request. Access to the Web Proxy service is denied.  ) log4j-test01 Unknown Maven Problem

解決方法以下：

（1）將C:\User\.m2\repository\org\apache\maven\plugins\maven-deploy-plugin目錄下的文件夾刪除，

（2）而後右擊項目Maven->Update Project->Update Dependencies（若是更新無效，選擇強制更新以下圖）

這樣問題就解決了！