在默认使用apache中央仓库时, 报错 protocol_version

https://cloud.tencent.com/developer/ask/136221/answer/241408

2018年6月，为了提高安全性和符合现代标准，不安全的TLS 1.0和1.1协议将不再支持SSL连接到Central。这只会影响Java 6的用户，这些用户也在使用https访问中央，根据我们的标准，中央用户不到2%。

有关更多细节和解决方法，请参见博客和常见问题解答：https：//blog.sonatype.com/enhancing-ssl-security-and-http/2-support-for-central

解决办法

maven的setting.xml设置为阿里云私服

 

<mirrors>

<!-- mirror

| Specifies a repository mirror site to use instead of a given repository. The repository that

| this mirror serves has an ID that matches the mirrorOf element of this mirror. IDs are used

| for inheritance and direct lookup purposes, and must be unique across the set of mirrors.

|

<mirror>

<id>mirrorId</id>

<mirrorOf>repositoryId</mirrorOf>

<name>Human Readable Name for this Mirror.</name>

<url>http://my.repository.com/repo/path</url>

</mirror>

-->

<mirror>

<id>nexus-aliyun</id>

<mirrorOf>*</mirrorOf>

<name>Nexus aliyun</name>

<url>http://maven.aliyun.com/nexus/content/groups/public</url>

</mirror>

</mirrors>

然后就ok了