Eclipse提示jre包访问限制 该怎样解决？？？

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class TextFiled extends JFrame {
    private JPanel jp = new JPanel();
    private JTextField jtf = new JTextField();
    private JButton jb = new JButton("确定");
   
    public TextFiled() {
        //初始化各组件
        jtf.setText("请输入你的用户名");
        //获取Toolkit对象
         Toolkit tool = Toolkit.getDefaultToolkit();
         Image icon = tool.getImage("D:\\Documents\\JavaProfiles\\高兴.gif");
        //设置JPanel的布局管理器
        jp.setLayout(new FlowLayout());
        jp.add(jtf);
        jp.add(jb);
        //初始化TextFiled窗口
        add(jp);
        setTitle("Test JTextFiled");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setIconImage(icon);
        setBounds(400,400,400,300);
        setResizable(false);
        setVisible(true);
    }
    public static void main(String[] args) {
        TextFiled textFiled = new TextFiled();
    }   
}