maven 依赖下载不了，出现lastUpdate文件_lastupdate maven 重新下载不成功

方案一，清maven缓存

windows系统

cd %userprofile%\.m2\repository
for /r %i in (*.lastUpdated) do del %i
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linux系统

find /app/maven/localRepository -name "*.lastUpdated" -exec grep -q "Could not transfer" {} \; -print -exec rm {} \;
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setting设置每次更新缓存

<repository>
  <id>central</id>
  <url>http://maven.aliyun.com/nexus/content/groups/public</url>
  <releases>
      <enabled>true</enabled>
  	  <updatePolicy>always</updatePolicy>
  </releases>
  <snapshots>
      <enabled>false</enabled>
	  <updatePolicy>always</updatePolicy>
  </snapshots>
</repository>
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打包更新

mvn -U clean package -Dmaven.test.skip=true
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方案二，lib放jar包

<dependency>
    <groupId>abc</groupId>
    <artifactId>abc</artifactId>
    <version>1.0</version>
    <scope>system</scope>
    <systemPath>${project.basedir}/src/main/webapp/WEB-INF/lib/abc.jar</systemPath>
</dependency>
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