java - JSF: invoke method if conversion fails -

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in jsf, how can invoke method in case of conversion failing on of input fields? guess can write own converters , stuff there, isn't there more simple way?

you use prerenderviewevent listener, , in method check if validation has failed. listener method called every time before view rendered.

e.g.

consider following facelet:

<html xmlns="http://www.w3.org/1999/xhtml"     xmlns:h="http://java.sun.com/jsf/html"     xmlns:f="http://java.sun.com/jsf/core" >     <h:body>          <h:messages/>          <f:event listener="#{onerrorbean.onprerenderview}" type="prerenderview" />          <h:form>             <h:inputtext value="#{onerrorbean.test}" label="test" required="true" />              <h:commandbutton value="submit" action="#{onerrorbean.onsuccess}" />         </h:form>      </h:body> </html>

and following backing bean:

@viewscoped @managedbean public class onerrorbean {      private string test;      public void onprerenderview() {         if (facescontext.getcurrentinstance().isvalidationfailed()) {             onerror();         }     }      public void onsuccess() {         system.out.println("success!");     }      public void onerror() {         system.out.println("error!");     }      public string gettest() {         return test;     }      public void settest(string test) {         this.test = test;     }  }

if press button without entering value you'll see "error!" being printed in console, enter value , you'll see "success!".


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