maven在执行过程中抛错：
引用… was cached in the local repository, resolution will not be reattempted until the update interval of nexus has elapsed or updates are forced -> [Help 1]
原因就是有些jar包没有完全下载完成，在编译的时候找不到jar包。只需要在配置文件中增加一个更新策略<updatePolicy>always</updatePolicy>就可以了。
找到你的conf/setting.xml
引用 <profile>
<id>nexus</id>
<!–Enable snapshots for the built in central repo to direct –>
<!–all requests to nexus via the mirror –>
<repositories>
<repository>
<id>central</id>
<url>http://central</url>
<releases><enabled>true</enabled><updatePolicy>always</updatePolicy></releases>
<snapshots><enabled>true</enabled><updatePolicy>always</updatePolicy></snapshots>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>central</id>
<url>http://central</url>
<releases><enabled>true</enabled><updatePolicy>always</updatePolicy></releases>
<snapshots><enabled>true</enabled><updatePolicy>always</updatePolicy></snapshots>
</pluginRepository>
</pluginRepositories>
</profile>
