項目是用spring springmvc hebrinate組成的架構，在添加的時候報了這個錯誤
controller貼在這里
求大神指教
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Servlet.service() for servlet [appServlet] in context with path [/item] threw exception [Request processing failed
message Request processing failed; nested exception is java.lang.NullPointerException
嚴重: Servlet.service() for servlet [jsp] threw exception java.lang.NullPointerException
Spring Cloud ZooKeeper集成Feign的坑2，服務調用了一次后第二次調用就變成了500，錯誤：Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is com.n
Spring Cloud ZooKeeper集成Feign的坑2，服務調用了一次后第二次調用就變成了500，錯誤：Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is com.n
Failed to start bean 'documentationPluginsBootstrapper'; nested exception is java.lang.NullPointerException
【隨手記錄】關於Factory method 'eurekaApplicationInfoManager' threw exception; nested exception is java.lang.NullPointerException
解決報錯 Failed to start bean 'documentationPluginsBootstrapper'; nested exception is java.lang.NullPointerException
dispatcher.DefaultDispatcherErrorHandler (DefaultDispatcherErrorHandler.java:69) - Exception occurred during processing request: null java.lang.NullPointerException: null
nested exception is java.lang.IllegalStateException: No instances available for HELLO-SERVICE] with root cause