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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Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause
------>Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause
Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause java.lang.Nul
關於Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause錯誤提示
錯誤：Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.NullPointerException]
Servlet.service() for servlet [gCmsFront] in context with path [/cms] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause java.lang.NullPoi
報錯：嚴重: Servlet.service() for servlet [springmvc] in context with path [ ] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause
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