以上報錯原因一般都是所在controller中引入service時候，忘記寫注解@Resource或者@Autowired注解導致
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報錯更改 Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] wit
Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed;springboot無法注入，注入后無效
錯誤：嚴重: Servlet.service() for servlet [appServlet] in context with path [] threw exception [Request processing failed; nested exception is org.mybatis.spring.MyBatisSystemException: nested exception is
Request processing failed; nested exception is java.lang.NullPointerException
Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception 異常
Servlet.service() for servlet [jsp] in context with path [/Healthy_manager] threw exception [Unable to compile class for JSP] with root cause java.lang.IllegalArgumentException: Page directive: inval
error：org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.NullPointerException
org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.NullPointerException
SSM整合中的nested exception is java.lang.NullPointerException問題
?--Porg.springframework.beans.MethodInvocationException: Property 'username' threw exception; nested exception is java.lang.NullPointerException