How to add and display errors in Struts 2x ?

Adding Action Errors

Action : Add the errors as required inside action methods, before returning a result.

addActionError( getText("error.user.add") );

JSP

Add s:actionerror tag, where to show the added errors on JSP page.

<div class="errors"> <s:actionerror /> </div>

Adding Action Messages

Action : Add the messages as required inside action methods, before returning a result.

addActionMessage( getText("success.user.add") );

JSP

Add s:actionmessage tag, where to show the added messages.

<div class="messages"> <s:actionmessage /> </div>

Adding Field errors

It is a special feature; by using it you can show errors specific to a particular field.

Action : Add the field errors as required inside action methods, before returning a result.

boolean isOk = true;

if( msisdn==null || "".equals(msisdn) ) {

   addFieldError("msisdn", getText("validation.msisdn.required"));

   isOk = false;

}

if( email==null || "".equals(email) ) {

   addFieldError("email", getText("validation.email.required"));

   isOk = false;

}

if(! isOk)

  return INPUT;

// business logic here, in case of no error

JSP file

<s:textfield name="msisdn" size="20" />

<div class="errors">

   <s:fielderror>

      <s:param>msisdn</s:param>

   </s:fielderror>

</div>

<s:textfield name="email" size="20" value="" />

<div class="errors">

   <s:fielderror>

      <s:param>email</s:param>

   </s:fielderror>

</div>