#set( $symbol_pound = '#' )
#set( $symbol_dollar = '$' )
#set( $symbol_escape = '\' )
package ${package}.client;

import com.google.gwt.user.client.rpc.RemoteService;
import com.google.gwt.user.client.rpc.RemoteServiceRelativePath;
import edu.pdx.cs410J.AbstractAppointmentBook;

/**
 * A GWT remote service that returns a dummy appointment book
 */
@RemoteServiceRelativePath("ping")
public interface PingService extends RemoteService {

  /**
   * Returns the current date and time on the server
   */
  public AppointmentBook ping();

}

#set( $symbol_pound = '#' )
#set( $symbol_dollar = '$' )
#set( $symbol_escape = '\' )
package ${package}.client;

import com.google.gwt.user.client.rpc.RemoteService;
import com.google.gwt.user.client.rpc.RemoteServiceRelativePath;

/**
 * A GWT remote service that returns a dummy appointment book
 */
@RemoteServiceRelativePath("ping")
public interface PingService extends RemoteService {

  /**
   * Returns the current date and time on the server
   */
  public AppointmentBook ping();

}

Remove an unused import.