js:

function(dialog) {

            var url = '/bin/logServlet';

            var result = CQ.HTTP.eval(url);

                              if (result.isMember) {

                alert("Log ok");

            }

        }

java path:

webcontent/apps/my app name/src/core/src/main/java/my app name/clinic/servlet/logServlet.java

@Property(name = "sling.servlet.paths", value = "/bin/logServlet")

running time error:

No resource found

Cannot serve request to /bin/logServlet in /libs/sling/servlet/errorhandler/404.jsp