上来一张图，
找了半天原因，最后发现是接口注入的时候忘记加 @Autowired
加上之后，重新启动项目就可以了。
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Exception in thread "main" java.lang.NullPointerException
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
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启动 Eclipse 报错 “An internal error occurred during: "Initializing Java Tooling". java.lang.NullPointerException”