JDIC 访问Web时NullPointerException

Exception in thread "EventThread" java.lang.NullPointerException
            at org.jdesktop.jdic.browser.internal.MsgClient.<init>(Unknown Source)
            at org.jdesktop.jdic.browser.internal.NativeEventThread.run(Unknown Source)

该错误原因为pc默认浏览器不是Ie引起的，在声明里设置默认浏览器即可解决。

public class BrowserTest {
    static {
        BrowserEngineManager engineManager = BrowserEngineManager.instance();
        engineManager.setActiveEngine(BrowserEngineManager.IE);
    }

    public static void main(String[] args) throws Exception {
        WebBrowser browser = new WebBrowser();
        browser.setURL(new URL("http://www.baidu.com"));
        JFrame frame = new JFrame("Browser Test");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().add(browser);
        frame.pack();
        frame.setSize(500, 500);
        frame.setVisible(true);
    }
}