WildFly CLI API ModelControllerClient deadlock?

The following snippet of code to redeploy an application:

ModelControllerClient cl = ModelControllerClient.Factory.create("localhost", 9999);
ModelNode operation = new ModelNode();
operation.get("operation").set("redeploy");
operation.get("address").add("deployment", "server.war");
cl.execute(operation);
cl.close();

• works fine, but .close() freezes forever.
  This issue depends to not only redeploy, but also for any other operations.