Servlet.service() for servlet [dispatcherServlet] in context && Whitelabel Error Page

ERROR 8040 – O.A.C.C.C. [nio – 8080 – exec – 1]. [[. [/] [dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause

to find for a long time, found and @autowired didn’t add question
service plus, didn’t add mapper


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