You have a static variable that is instantiated when its needed (lazy
instantiation).
private static AsyncCallback<Person> findPersonCallback;
private AsyncCallback<Person> createFindPersonCallback() {
if(findPersonCallback == null) {
findPersonCallback = new AsyncCallback<Person>() {
//...... implement .....
}
}
return findPersonCallback;
}
public void fetchByName(String name) {
AsyncCallback<Person> callback = createFindPersonCallback();
personService.findByName(name, callback);
}
-- J.
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