解決：service類或dao類需要@Autowired
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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]
Request processing failed; nested exception is java.lang.NullPointerException
SEVERE: Servlet.service() for servlet [SpringMVC] in context with path [] threw exception ........
SSM框架報HTTP Status 500 - Request processing failed; nested exception is java.lang.NullPointerException錯
【錯誤日志】嚴重: Servlet.service() for servlet SpringDispatcherServlet threw exception java.lang.IllegalArgumen
Swagger2 Failed to start bean 'documentationPluginsBootstrapper'; nested exception is java.lang.NullPointerException報錯