jsf - Validation Error: Value is not valid -

-

i have problem p:selectonemenu, no matter cannot jsf call setter on jpa entity. jsf validation fails message:

form:location: validation error: value not valid

i have working on several other class of same type (ie, join table classes) cannot life of me 1 working.

if can throw troubleshooting/debugging tips sort of problem appreciated.

using log statements have verified following:

  1. the conveter returning correct, non null values.
  2. i have no bean validation in jpa entities.
  3. the setter setlocation(location location) never called.

this simplest example can , not work:

<h:body>     <h:form id="form">         <p:messages id="messages" autoupdate="true" />         <p:selectonemenu id="location" value="#{locationstocklist.selected.location}" converter="locationconverter">             <p:ajax event="change" update=":form:lbllocation"/>             <f:selectitems value="#{locationstocklist.locationselection}"/>         </p:selectonemenu>     </h:form> </h:body>

converter:

@facesconverter(forclass=location.class, value="locationconverter") public class locationconverter implements converter, serializable {     private static final logger logger = logger.getlogger(locationconverter.class.getname());      @override     public object getasobject(facescontext context, uicomponent component, string value) {         if (value.isempty())             return null;         try {             long id = long.parselong(value);             location location = ((locationmanagedbean) context.getapplication().getelresolver().getvalue(context.getelcontext(), null, "location")).find(id);             logger.log(level.severe, "converted {0} {1}" , new object[] {value, location});             return location;         } catch (numberformatexception e) {             return new location();         }     }      @override     public string getasstring(facescontext context, uicomponent component, object value) {         if (value == null || value.tostring().isempty() || !(value instanceof location))             return "";         return string.valueof(((location) value).getid());     }     }

console output:

// getter method info: current value=ejb.locations.location[id=null, name=null, latitude=0.0, longitude=0.0]  // session bean info: finding ejb.locations.location id=3  // session bean info: ### returning : ejb.locations.location[id=3, name=mdmd, latitude=4.5, longitude=2.3]  // converter severe: converted 3 ejb.locations.location[id=3, name=mdmd, latitude=4.5, longitude=2.3]  // getter method -> did selected location go ?? info: current value=ejb.locations.location[id=null, name=null, latitude=0.0, longitude=0.0]

validation fails message "form:location: validation error: value not valid"

this error boils down selected item not match of available select item values specified nested <f:selectitem(s)> tag during processing of form submit request.

as part of safeguard against tampered/hacked requests, jsf reiterate on available select item values , test if selecteditem.equals(availableitem) returns true @ least 1 available item value. if no 1 item value matches, you'll validation error.

this process under covers below, whereby bean.getavailableitems() fictionally represents entire list of available select items defined <f:selectitem(s)>:

string submittedvalue = request.getparameter(component.getclientid()); converter converter = component.getconverter(); object selecteditem = (converter != null) ? converter.getasobject(context, component, submittedvalue) : submittedvalue;  boolean valid = false;  (object availableitem : bean.getavailableitems()) {     if (selecteditem.equals(availableitem)) {         valid = true;         break;     } }  if (!valid) {     throw new validatorexception("validation error: value not valid"); }

so, based on above logic, problem can logically have @ least following causes:

  1. the selected item missing in list of available items.
  2. the equals() method of class representing selected item missing or broken.
  3. if custom converter involved, has returned wrong object in getasobject(). perhaps it's null.

to solve it:

  1. ensure same list been preserved during subsequent request, particularly in case of multiple cascading menus. making bean @viewscoped instead of @requestscoped should fix in cases. make sure don't perform business logic in getter method of <f:selectitem(s)>, instead in @postconstruct or action event (listener) method. if you're relying on specific request parameters, you'd need explicitly store them in @viewscoped bean, or re-pass them on subsequent requests e.g. <f:param>. see how choose right bean scope?
  2. ensure equals() method implemented right. done right on standard java types such java.lang.string, java.lang.number, etc, not on custom objects/beans/entites. see right way implement equals contract. in case you're using string, make sure request character encoding configured right. if contains special characters , jsf configured render output utf-8 interpret input e.g. iso-8859-1, fail. see a.o. unicode input retrieved via primefaces input components become corrupted.
  3. debug/log actions of custom converter , fix accordingly. guidelines, see conversion error setting value 'null converter' in case you're using java.util.date available items <f:convertdatetime>, make sure don't forget full time part in pattern. see "validation error: value not valid" error f:datetimeconverter.

see also:

if can throw troubleshooting/debugging tips sort of problem appreciated.

just ask clear , concrete question here. not ask broad questions ;)


Comments

Post a Comment