一、生成文档过程中报错： Unable to determine if resource junit:junit:jar:3.8.1:test exists in http://maven.aliyun.com/nexus/content/groups/public
版本：3.6.3
首先，已经生成过一次文档了，但是之前报错：
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[ERROR] Failed to execute goal org.apache.maven.plugins:maven-site-plugin:3.3:site (default-site) on project consumerBanking: Execution default-site of goal org.apache.maven.plugins:maven-site-plugin:3.3:site failed: A required class was missing while executing org.apache.maven.plugins:maven-site-plugin:3.3:site: org/apache/maven/doxia/siterenderer/DocumentContent
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To see the full stack trace of the errors, re-run Maven with the -e switch.
然后修改pom.xml添加 maven-site-plugin 的版本之后，这个问题消失。
但是出现了如下问题。
Unable to determine if resource junit:junit:jar:3.8.1:test exists in http://maven.aliyun.com/nexus/content/groups/public