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java.lang.IllegalArgumentException: 'mediaType' must not be empty	at org.springframework.util.Assert.hasLength(Assert.java:136)	at org.springframework.http.MediaType.parseMediaType(MediaType.java:638)	at org.springframework.http.MediaType.parseMediaTypes(MediaType.java:691)	at org.springframework.web.servlet.mvc.condition.ProducesRequestCondition.getAcceptedMediaTypes(ProducesRequestCondition.java:214)	at org.springframework.web.servlet.mvc.condition.ProducesRequestCondition.access$4(ProducesRequestCondition.java:211)	at org.springframework.web.servlet.mvc.condition.ProducesRequestCondition$ProduceMediaTypeExpression.matchMediaType(ProducesRequestCondition.java:283)	at org.springframework.web.servlet.mvc.condition.AbstractMediaTypeExpression.match(AbstractMediaTypeExpression.java:63)	at org.springframework.web.servlet.mvc.condition.ProducesRequestCondition.getMatchingCondition(ProducesRequestCondition.java:163)	at org.springframework.web.servlet.mvc.method.RequestMappingInfo.getMatchingCondition(RequestMappingInfo.java:175)	at org.springframework.web.servlet.mvc.method.RequestMappingInfoHandlerMapping.getMatchingMapping(RequestMappingInfoHandlerMapping.java:64)	at org.springframework.web.servlet.mvc.method.RequestMappingInfoHandlerMapping.getMatchingMapping(RequestMappingInfoHandlerMapping.java:1)	at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.addMatchingMappings(AbstractHandlerMethodMapping.java:284)	at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.lookupHandlerMethod(AbstractHandlerMethodMapping.java:251)	at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.getHandlerInternal(AbstractHandlerMethodMapping.java:216)	at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.getHandlerInternal(AbstractHandlerMethodMapping.java:1)	at org.springframework.web.servlet.handler.AbstractHandlerMapping.getHandler(AbstractHandlerMapping.java:288)	at org.springframework.web.servlet.DispatcherServlet.getHandler(DispatcherServlet.java:1063)	at org.springframework.web.servlet.DispatcherServlet.getHandler(DispatcherServlet.java:1048)	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:886)	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)