code: private boolean resourceExists(final ModelNode address, final ModelControllerClient client) throws IOException {
          final Property childAddress = ServerOperations.getChildAddress(address);
          final ModelNode parentAddress = ServerOperations.getParentAddress(address);
          final ModelNode r = client.execute(ServerOperations.createOperation(ServerOperations.READ_RESOURCE, parentAddress, false));
          reportFailure(r);
          boolean found = false;
          final String name = childAddress.getName();
          if (ServerOperations.isSuccessfulOutcome(r)) {
              final ModelNode resources = ServerOperations.readResult(r).get(name);
              if (resources.isDefined()) {
                  for (ModelNode dataSource : resources.asList()) {
                      if (dataSource.asProperty().getName().equals(childAddress.getValue().asString())) {
                          found = true;
                      }
                  }
              }
          }
          return found;
      }
docs: Checks the existence of a resource. If the resource exists, {@code true} is returned, otherwise {@code false}.
  
  @param address the address of the resource to check.
  @param client  the client used to execute the operation.
  
  @return {@code true} if the resources exists, otherwise {@code false}.
  
  @throws IOException      if an error occurs executing the operation.
  @throws RuntimeException if the operation fails.