ResourceException: avoid NotSerializableException

- non-serializable internal attributes (status, request, and message) marked as transient
- this is to allow ResourceException to be serialized, passing over the message and stack-trace (which is typically all that is needed to show the error or print it in the log)
- fixes issue restlet#1402

Author: tomas-muller

modules/org.restlet/src/main/java/org/restlet/resource/ResourceException.java

@@ -38,13 +38,13 @@ public class ResourceException extends RuntimeException {
     private static final long serialVersionUID = 1L;
 
     /** The status associated to this exception. */
-    private final Status status;
+    private final transient Status status;
 
     /** The request associated to this exception. Could be null. */
-    private final Request request;
+    private final transient Request request;
 
     /** The response associated to this exception. Could be null.  */
-    private final Response response;
+    private final transient Response response;
 
     /**
      * Constructor.