這個offline 表示離線模式，如果已經下載了jar包，但是包可能有問題，就是說它不會聯網去獲取jar包！
把勾去掉就可以了！，它就可以重新聯網下載jar了
免責聲明！
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IDEA Cannot access alimaven (http://maven.aliyun.com/nexus/content/groups/public/)
[ERROR] Plugin org.apache.maven.plugins:maven-clean-plugin:2.5 or one of its dependencies could not be resolved: Cannot access nexus-aliyun (http://maven.aliyun.com/nexus/content/groups/public) in off
小知識：最近發現http://maven.aliyun.com/nexus/content/groups/public的倉庫，pom下載jar包失敗了
異常Failure to transfer org.apache.maven.plugins:maven-surefire-plugin:pom:2.12.4 from http://maven.aliyun.com/nexus/content/groups/public was ...
maven build失敗 (Failure to find io.renren:renren-security:pom:3.2.0 in http://maven.aliyun.com/nexus/content/groups/public/ was cached in the local repository...)
Failure to transfer org.codehaus.plexus:plexus-utils:pom:1.5.6 from http://maven.aliyun.com/nexus/content/groups/public/ was cached in the local repository, resolution will not be reattempted until th
maven------Failure to find xxxx in http://maven.aliyun.com/
ERROR: Could not GET 'https://maven.aliyun.com/repository/google/com/android/tools/build/gradle/3.5.2/gradle-3.5.2.pom'. Received status code 400 from server:
maven Could not find artifact com.** 無法下載原因分析
【微服務領域】Cannot access central (https://repo.maven.apache.org/maven2) in offline mode and the artifact