[eclipse] 500에러 - java.lang.IllegalStateException: Optional int parameter 'no' is not present but cannot be translated into a null value

@RequestParam에 int값이 오는 경우에, url에서 null값인 상태로 들어오면 나타나는 에러.

예를 들어 /com? 으로 끝나면 이런 상태가 된다. 간단하게는 dafaultValue="0"으로 막을 수 있다. 

만약 ?no= 까지만 끊긴다면 ?뒤를 split해서 length가 4보다 작은 경우를 따져서 분기처리할 수 있겠다.

 

 

java.lang.IllegalStateException: Optional int parameter 'no' is not present but cannot be translated into a null value due to being declared as a primitive type. Consider declaring it as object wrapper for the corresponding primitive type.
	org.springframework.web.bind.annotation.support.HandlerMethodInvoker.checkValue(HandlerMethodInvoker.java:742)
	org.springframework.web.bind.annotation.support.HandlerMethodInvoker.resolveRequestParam(HandlerMethodInvoker.java:511)
	org.springframework.web.bind.annotation.support.HandlerMethodInvoker.resolveHandlerArguments(HandlerMethodInvoker.java:348)
	org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:171)
	org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:436)
	org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:424)
	org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:900)
	org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:827)
	org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
	org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:626)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:733)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
	org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
	org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)