maven项目不能自动更新jar（造成jar缺失的问题）

1、问题如下：

 The container 'Maven Dependencies' references non existing library '/Users/xxx/.m2/repository/ognl/ognl/3.0.8/ognl-3.0.8.jar'xxx-xxx Build pathBuild Path Problem

2、解决措施，删除资源库里 出错的jar rm -rf ognl-3.0.8.jar.lastUpdated，之后maven 重新更新整个工程。(未能解决)---->删除，3.0.8整个文件夹，再次更新，解决问题。

另外的一个问题：

问题如下：

Description Resource Path Location Type
Failure to transfer org.apache.maven.plugins:maven-surefire-plugin:pom:2.18.1 from http://maven.aliyun.com/nexus/content/groups/public was cached in the local repository, resolution will not be reattempted until the update interval of nexus-aliyun has elapsed or updates are forced. Original error: Could not transfer artifact org.apache.maven.plugins:maven-surefire-plugin:pom:2.18.1 from/to nexus-aliyun (http://maven.aliyun.com/nexus/content/groups/public): The operation was cancelled. pom.xml /项目名字 line 1 Maven Configuration Problem

解决措施：

删除所有下载失败的文件：

linux环境下：find /Users/riibon/.m2/ -name "*.lastUpdated" -exec grep -q "Could not transfer" {} \; -print -exec rm {} \;