Index: skeleton/remote/ExceptionReference.class.php
===================================================================
--- skeleton/remote/ExceptionReference.class.php	(revision 7946)
+++ skeleton/remote/ExceptionReference.class.php	(working copy)
@@ -4,15 +4,17 @@
  * $Id$ 
  */
 
+  uses('util.ChainedException');
+
   /**
    * Holds a reference to an exception
    *
    * @see      xp://remote.Serializer
    * @purpose  Exception reference
    */
-  class ExceptionReference extends Exception {
+  class ExceptionReference extends ChainedException {
     var 
-      $classname= '';
+      $referencedClassname= '';
 
     /**
      * Constructor
@@ -21,17 +23,30 @@
      * @param   string classname
      */
     function __construct($classname) {
-      $this->classname= $classname;
+      parent::__construct('(null)', $cause= NULL);
+      $this->referencedClassname= $classname;
     }
-
+    
     /**
-     * Get Classname
+     * Return string representation of this exception
      *
      * @access  public
      * @return  string
      */
-    function getClassname() {
-      return $this->classname;
+    function toString() {
+      $s= sprintf(
+        "Exception %s<%s> (%s)\n",
+        $this->getClassName(),
+        $this->referencedClassname,
+        $this->message
+      );
+      for ($i= 0, $t= sizeof($this->trace); $i < $t; $i++) {
+        $s.= $this->trace[$i]->toString(); 
+      }
+      return $s.($this->cause
+        ? 'Caused by '.$this->cause->toString() 
+        : ''
+      );;
     }
   }
 ?>
Index: ext/java/easc/java/src/net/xp_framework/unittest/SerializerTest.java
===================================================================
--- ext/java/easc/java/src/net/xp_framework/unittest/SerializerTest.java	(revision 7946)
+++ ext/java/easc/java/src/net/xp_framework/unittest/SerializerTest.java	(working copy)
@@ -378,7 +378,7 @@
         String serialized= representationOf(new NullPointerException());
 
         assertEquals(
-            "e:11:\"NullPointer\":2:{s:7:\"message\";N;s:5:\"trace\";a:",
+            "e:11:\"NullPointer\":3:{s:7:\"message\";N;s:5:\"trace\";a:",
             serialized.substring(0, 52)
         );
         int offset= serialized.indexOf(':', 52)+ 2;
@@ -397,7 +397,7 @@
         String serialized= representationOf(new Exception());
 
         assertEquals(
-            "E:19:\"java.lang.Exception\":2:{s:7:\"message\";N;s:5:\"trace\";a:",
+            "E:19:\"java.lang.Exception\":3:{s:7:\"message\";N;s:5:\"trace\";a:",
             serialized.substring(0, 60)
         );
         int offset= serialized.indexOf(':', 60)+ 2;
Index: ext/java/easc/java/src/net/xp_framework/easc/protocol/standard/Serializer.java
===================================================================
--- ext/java/easc/java/src/net/xp_framework/easc/protocol/standard/Serializer.java	(revision 7946)
+++ ext/java/easc/java/src/net/xp_framework/easc/protocol/standard/Serializer.java	(working copy)
@@ -720,17 +720,22 @@
         } else {
             buffer.append("E:").append(c.getName().length()).append(":\"").append(c.getName());
         }
-        buffer.append("\":2:{s:7:\"message\";");
+        
+        // Message
+        buffer.append("\":3:{s:7:\"message\";");
         buffer.append(representationOf(e.getMessage(), context));
+        
+        // Stacktrace
+        int offset= 0;
         buffer.append("s:5:\"trace\";a:").append(trace.length).append(":{");
-
-        int offset= 0;
         for (StackTraceElement element: trace) {
             buffer.append("i:").append(offset++).append(';').append(representationOf(element, context));
         }
 
-        buffer.append("}}");
-        return buffer.toString();        
+        // Cause
+        buffer.append("}s:5:\"cause\";").append(representationOf(e.getCause()));
+        
+        return buffer.append("}").toString();        
     }
     
     @Handler('i') protected static String representationOf(Enum e, SerializerContext context) throws Exception {