java.lang.NullPointerException: This exception has no message.


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Stack trace

java.lang.NullPointerException
	at java.util.Hashtable.get(Hashtable.java:334)
	at org.apache.tomcat.util.http.Parameters.getParameterValues(Parameters.java:194)
	at org.apache.tomcat.util.http.Parameters.getParameter(Parameters.java:239)
	at org.apache.catalina.connector.Request.getParameter(Request.java:1042)
	at org.apache.catalina.connector.RequestFacade.getParameter(RequestFacade.java:355)
	at javax.servlet.ServletRequestWrapper.getParameter(ServletRequestWrapper.java:158)
	at javax.servlet.ServletRequestWrapper.getParameter(ServletRequestWrapper.java:158)
	at org.springframework.web.context.request.ServletWebRequest.getParameter(ServletWebRequest.java:113)
	at org.springframework.web.accept.ParameterContentNegotiationStrategy.getMediaTypeKey(ParameterContentNegotiationStrategy.java:60)
	at org.springframework.web.accept.AbstractMappingContentNegotiationStrategy.resolveMediaTypes(AbstractMappingContentNegotiationStrategy.java:46)
	at org.springframework.web.accept.ContentNegotiationManager.resolveMediaTypes(ContentNegotiationManager.java:102)
	at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.getAcceptableMediaTypes(AbstractMessageConverterMethodProcessor.java:189)
	at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:114)
	at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:90)
	at org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.handleReturnValue(RequestResponseBodyMethodProcessor.java:189)
	at org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:69)
	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:122)
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:746)
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:687)
	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:915)
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:811)

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