Cannot send a null Map key for type 'java.util.HashMap'

Question

Hi All,
  I am haing an issue with sending data from Server to the client using the AMF Channel.
  Most of the method invocations on the RemoteObject are throwing the following Exception.
[CODE]
(mx.rpc.events::FaultEvent)#0
  bubbles = false
  cancelable = true
  currentTarget = (null)
  eventPhase = 2
  fault = (mx.rpc::Fault)#1
    content = (null)
    errorID = 0
    faultCode = "Server.Processing"
    faultDetail = (null)
    faultString = "Cannot send a null Map key for type 'java.util.HashMap'."
    message = "faultCode:Server.Processing faultString:'Cannot send a null Map key for type 'java.util.HashMap'.' faultDetail:'null'"
    name = "Error"
    rootCause = (null)
  headers = (null)
  message = (mx.messaging.messages::ErrorMessage)#2
    body = (null)
    clientId = "22E55FB1-910E-312F-E37A-ED5167139CB0"
    correlationId = "4DB54224-662A-C596-D165-F7C3EBB64DB8"
    destination = "TimeMap"
    extendedData = (null)
    faultCode = "Server.Processing"
    faultDetail = (null)
    faultString = "Cannot send a null Map key for type 'java.util.HashMap'."
    headers = (Object)#3
    messageId = "22E56255-D62F-2ACF-4DA5-CF1E4D6353BB"
    rootCause = (null)
    timestamp = 1266877198902
    timeToLive = 0
  messageId = "22E56255-D62F-2ACF-4DA5-CF1E4D6353BB"
  statusCode = 0
  target = (null)
  token = (mx.rpc::AsyncToken)#4
    message = (mx.messaging.messages::RemotingMessage)#5
      body = (Array)#6
      clientId = (null)
      destination = "TimeMap"
      headers = (Object)#7
        DSEndpoint = "my-amf"
        DSId = "22E53936-7E0E-B21C-C936-EF1078000306"
      messageId = "4DB54224-662A-C596-D165-F7C3EBB64DB8"
      operation = "getMapKey"
      source = (null)
      timestamp = 0
      timeToLive = 0
    responders = (Array)#8
      [0] (com.universalmind.cairngorm.events::Callbacks)#9
        conflictHandler = (null)
        faultHandler = (function)
        priority = 0
        resultHandler = (function)
    result = (null)
  type = "fault"
[CODE]
The Spring bean which is exposed as a Remote Object has the following method signature..
[CODE]
public String getMapKey() {
        return mapKey;
[/CODE]
I am unable to understand why AMF Channel or Blaze DS is treating the String as HashMap !!!
This was working pefectly fine till yesterday !!
The version of the BlazeDS i am using is : blazeds_turnkey_3-0-0-544
and the Flex SDK Version is : flex_sdk_3.5.0.12683
We recently upgraded to Flex 3.5.0 version earlier we were using 3.3 version
Thanks
mars

Answer 1

Hi All,
I chcked my server side java beans ( which are managed by Spring) and they are all returning the data property and none of the Keys in the returned hashmaps are null.
Not sure why this is happening.
Thanks
kumars