BlazeDS serialization with complex types

I recently came into a situation when sending a nested object from Java to Flex via a HashMap the Objects were null. More precisely:

final Map<Integer, List<String>> tempMap = new HashMap<Integer, List<String>>();

would send the keys as integers but the values were all null.

But when sending the same with String keys:

final Map<String, Lis开发者_高级运维t<String>> tempMap = new HashMap<String, List<String>>();

the objects came thru.

Are there any restrictions in BlazeDS serialization when using complex types as keys?

1. Turn on property errors in your services.config.xml:

   <channels>
    <channel-definition id="YourChannel" class="mx.messaging.channels.AMFChannel">
    <endpoint url="http://{server.name}:{server.port}/{context.root}/messagebroker/amf" class="flex.messaging.endpoints.AMFEndpoint" />
   
    <properties>
     <polling-enabled>false</polling-enabled>
     <serialization>
      <ignore-property-errors>false</ignore-property-errors>
      <log-property-errors>true</log-property-errors>
     </serialization>
    </properties>
   
    </channel-definition>
   </channels>
   

2. Try to remove final keyword and try it without it. I had problems serializing final fields with blazeds