jsp - (Spring controller) The requirement sent by the client was syntactically incorrect -

i have following jsp:

<form:form method="post" commandname="fare">     <div><fmt:message key="createfares.name" /></div>     <div><form:input path="name" type="text"></form:input> </div>     <div><fmt:message key="createfares.amount" /></div>     <div><form:input path="amount" type="number" min="0" step="0.01"></form:input></div>     <div><fmt:message key="createfares.startdate" /></div>     <div><input name="startdate" type="date"/> </div>     <div><fmt:message key="createfares.enddate" /></div>     <div><input name="enddate" type="date"/> </div>     <div><fmt:message key="createfares.description" /></div>     <form:textarea path="description" cols="125" />       <div><form:errors path="*"/></div>     <fmt:message key="modifyfare.note" />     <div class="submit"><input name="submit" type="submit" value="<fmt:message key="tooltip.modifyfare" />"></div> </form:form> 

and have following controllers:

@requestmapping(value="/modify/{idfare}", method=requestmethod.get) public string getmodifyfare(@pathvariable string idfare, modelmap model)  @requestmapping(value="/modify/{idfare}", method=requestmethod.post) public string postmodifyfare(@pathvariable string idfare, @modelattribute("fare") @valid fare fare, modelmap model,         bindingresult result, final redirectattributes redirectattributes,         @requestparam(required = false) string startdate, @requestparam(required = false) string enddate) 

the works perfectly, post says "the requirement sent client syntactically incorrect".

anyone know why happening?

in signature of controller's method handle post, have both redirectattributes , modelmap. these 2 types storing variables in model. maybe in conflict. try remove 1 of them.