Timer-Class should call Methods after some Time

I have a lot of classes that try to write something into a database when i start my Wildfly-Server. It happens that the database is not deployed in the first place and then i get a lot of HTTPNotFound Exceptions.

Because i have a lot classes i dont wanted duplicated Code and wanted to write a helper Class "TimerHelper", where i give him for example a method and say "Try that method, if you get an exception, wait some time and try again"

Some PseudoCode:

public class TimerHelper extends TimerTask{
Object o;

public TimerHelper(Object o){
  this.o = o;
}

public boolean startTask(){
try{
  o.start();
}catch(Exception e){
  this.wait(200);
  o.start();
  }
 }
}

The Class that wants to write into database:

@Startup
@Singleton
public class Motor{

@PostConstruct
 public void init(){
  TimerHelper timer = new TimerHelper(this);
 } 

 public void start(){
   database.write("foobar");
  }
}