Unwrap nested ServiceAuthExceptions(this happens when one service calls

another and the inner call fails authentication).

Refs: #7817

@@ -73,6 +73,7 @@ import org.ofbiz.entity.util.EntityUtil;
 import org.ofbiz.entity.condition.EntityOperator;
 import org.ofbiz.entity.condition.EntityCondition;
 import org.ofbiz.service.DispatchContext;
+import org.ofbiz.service.GenericServiceException;
 import org.ofbiz.service.LocalDispatcher;
 import org.ofbiz.service.ModelService;
 import org.ofbiz.service.ServiceAuthException;
@@ -245,13 +246,23 @@ public class DirectControlServlet extends HttpServlet {
             tmpOut.close();
 
             try {
+                try {
                     processRequest();
+                } catch (GenericServiceException e) {
+                    Throwable cause = e;
+                    while ((cause = cause.getCause()) != null) {
+                        if (cause instanceof ServiceAuthException) {
+                            throw (ServiceAuthException) cause;
+                        }
+                    }
+                    throw e;
+                }
             } catch (IOException e) {
                 throw e;
             } catch (ServiceAuthException e) {
                 e.printStackTrace();
-                Debug.logError(e, "ServiceAuthException", module);
-                response.setStatus(401);
+                Debug.logError(e, "ServiceAuthException(setting status to 401)", module);
+                response.sendError(401, e.getMessage());
                 setResponseNoCache();
             } catch (Exception e) {
                 e.printStackTrace();