I replaced jar jsr311-api-1.0.jar to jsr311-api-1.1.1.jar solved the URIBuilder Error Issue. Now I am able to delete the process from the guvnor repository using the following code snippet.
WebClient client = WebClient.create("http://localhost:8080/drools-guvnor/rest/packages/SDS/assets/"+ asset.getName(), "admin", "admin", null);
Response response = client.delete();
I hope this would help someone.
Thanks Tihomir.