@SuppressWarnings({"UnusedDeclaration"})
    public Collection<AuthenticationListener> getAuthenticationListeners() {
        return this.listeners;
    }
Returns the {@link AuthenticationListener AuthenticationListener}s that should be notified during authentication
attempts.

@return the {@link AuthenticationListener AuthenticationListener}s that should be notified during authentication
attempts.
core/src/main/java/org/apache/shiro/authc/AbstractAuthenticator.java