Hello, we are using BlazeDS as a proxy between Flex and Java. The approach is the same as in (http://www.flexpasta.com/index.php/2008/05/16/exception-handling-with-blazeds-and-flex/)

Java exception declaration:

public class FlexException extends RuntimeException {
 private String name = 'John';

 public FlexException(String message) {
   super(message);
 }

 public String getName() {
   return name;
 }
}

Then, we are throwing it:

public void testMethod(String str) throws Exception {
 throw new FlexException("Custom exception");
}

Flex part:

private function faultHandler(event:FaultEvent):void
{
  var errorMessage:ErrorMessage = event.message as ErrorMessage;
  trace("error++");
}

and remote object is instantiated here:

<mx:RemoteObject id="mySample" destination="mySample" channelSet="{cs1}" fault="faultHandler(event)" />

But in event.fault I get "Server.Processing" and event.faultString equals "There was an unhandled failure on the server. Custom exception" How can I receive the data is specified in exception props ?

BlazeDS log is similar to the log that was mentioned in the comment

[BlazeDS] 11:28:13.906 [DEBUG] Serializing AMF/HTTP response
Version: 3
(Message #0 targetURI=/2/onStatus, responseUR|-)
(Typed Object #0 ‘flex.messaging.messages.ErrorMessage’)
headers = (Object #1)
rootCause = null
body = null
correlationId = “2F1126D7-5658-BE40-E27C-7B43F3C5DCDD”
faultDetail = null
faultString = “Login required before authorization can proceed.”
clientId = “C4F0E77C-3208-ECDD-1497-B8D070884830?
timeToLive = 0.0
destination = “books”
timestamp = 1.204658893906E12
extendedData = null
faultCode = “Client.Authentication”
messageId = “C4F0E77C-321E-6FCE-E17D-D9F1C16600A8?

So the quesion is why rootClause is null? How can I get that Exception object not just a string 'Custom exception'?