Missing artifact net.sf.json-lib:json-lib:jar:2.4
遇到这种更新不下来的错误 要在后边追加<classifier>jdk15</classifier> 即可
<dependency>
<groupId>net.sf.json-lib</groupId>
<artifactId>json-lib</artifactId>
<version>2.4</version>
<classifier>jdk15</classifier>
</dependency>