title: How to solve "NullPointerException" with "Server.processing" error while we are using Flex Builder 3 and BlazeDS?
body: <p>I am using Flex builder 3, BlazeDS, and Java with Spring and Hibernate framework. I using the remote object to load a string from spring's configuration files. But in testing, I found this fault event like this:</p>
  
  <blockquote>
    <p>RPC Fault
    faultString="java.lang.NullPointerException"
    faultCode="Server.Processing"
    faultDetail="null"</p>
  </blockquote>
  
  <p>I have checked the configuration in remote-config.xml and services-config.xml. But it looks good. Some people have talked about this problem around the Internet and I think you can help me and them.</p>
  
  <p>I am using these environment:</p>
  
  <ul>
  <li>Flex Builder 3</li>
  <li>BlazeDS 3.2.0</li>
  <li>JBoss server</li>
  </ul>
  
  <p>Full stacktrace:</p>
  
  <pre>
  [RPC Fault faultString="java.lang.NullPointerException" faultCode="Server.Processing" faultDetail="null"]
   at mx.rpc::AbstractInvoker/http://www.adobe.com/2006/flex/mx/internal::faultHandler()[C:\autobuild\3.2.0\frameworks\projects\rpc\src\mx\rpc\AbstractInvoker.as:220]
   at mx.rpc::Responder/fault()[C:\autobuild\3.2.0\frameworks\projects\rpc\src\mx\rpc\Responder.as:53]
   at mx.rpc::AsyncRequest/fault()[C:\autobuild\3.2.0\frameworks\projects\rpc\src\mx\rpc\AsyncRequest.as:103]
   at NetConnectionMessageResponder/statusHandler()[C:\autobuild\3.2.0\frameworks\projects\rpc\src\mx\messaging\channels\NetConnectionChannel.as:569]
   at mx.messaging::MessageResponder/status()[C:\autobuild\3.2.0\frameworks\projects\rpc\src\mx\messaging\MessageResponder.as:222]
  </pre>