没加注解可能报的错误
严重: Servlet.service() for servlet [dispatcher] in context with path [/cc] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause
java.lang.NullPointerException
严重: Servlet.service() for servlet [dispatcher] in context with path [/cc] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause
java.lang.NullPointerException
