I can not call JOptionPane in Eclipse

Well, I'm not able to call JOptionPane in any class in eclipse, I tried Netbeans, and it ran normal. Can anyone here know what it can be?

Error message:

  Multiple markers at this line   - Access restriction: The type JOptionPane is not accessible due to restriction on required library C: \ Program   Files \ Java \ jre1.8.0_73 \ lib \ rt.jar   - Access restriction: The method showMessageDialog (Component, Object) from the type JOptionPane is not accessible due to restriction on   required library C: \ Program Files \ Java \ jre1.8.0_73 \ lib \ rt.jar

Code:

package br.projeto.model;
import javax.swing.*;
public class Caixa {

Cliente client = new Cliente();

public void showAvaibleBalance(Cliente client){
    client.getBalance();
}

public void makeLoot(Cliente client, double value){
    if((value > 0)&&(value < client.getBalance())){
        client.setBalance(client.getBalance()-value);
    }else if (value < 0){
        JOptionPane.showMessageDialog(null, "");
    }
}
}