Event Handlers not working

I m trying to handle changes of value data table throught Rest API (PUT request) but Event Handler doesnt call any method like “beforeUpdate” , logs like System.out.println(“beforeUpdate”) and debugger breakpoints not calls also , just Waiting for events…

public class UserTableEventHandler extends com.backendless.servercode.extension.PersistenceExtender<User> {
 public void beforeUpdate(RunnerContext context, User user) throws Exception {
 System.out.println("update ");

Hi, Alex.
What is your appId ?