无法从类加载器错误解密java类不可见

时间:2009-11-05 20:45:21

标签: java ikpicturetaker rococoa

我正在尝试编写一些代码将使用Rococoa加载Cocoa IKPictureTaker小部件的java代码。我觉得我现在越来越近但我收到了一个错误,我不太确定它为什么会发生。我得到的错误是:

Exception in thread "main" java.lang.ExceptionInInitializerError
at IKPictureTakerTest.main(IKPictureTakerTest.java:39)
Caused by: java.lang.IllegalArgumentException: interface IKPictureTaker$_Class is not visible from class loader
at java.lang.reflect.Proxy.getProxyClass(Proxy.java:353)
at java.lang.reflect.Proxy.newProxyInstance(Proxy.java:581)
at org.rococoa.Rococoa.createProxy(Rococoa.java:164)
at org.rococoa.Rococoa.wrap(Rococoa.java:118)
at org.rococoa.Rococoa.createClass(Rococoa.java:50)
at IKPictureTaker.<clinit>(IKPictureTaker.java:31)

因此,首先在这里进行交互的两个小类是IKPictureTaker类:​​

public interface IKPictureTaker extends NSObject
{
   public static final _Class MYCLASS = Rococoa.createClass("IKPictureTaker", _Class.class);

   public interface _Class extends NSClass
   {
   /**
   * Returns a shared {@code IKPictureTaker} instance, creating it if necessary.
   * @return an {@code IKPictureTaker} object.
   */
   IKPictureTaker pictureTaker();
   }

   NSInteger runModal();
}

测试类:

public class IKPictureTakerTest extends JFrame
{
   public static void main(String[] args) throws Exception
   {
      // You need a GUI before this will work.
      new IKPictureTakerTest().setVisible(true);

      NSAutoreleasePool pool = NSAutoreleasePool.new_();

      QTKit instance = QTKit.instance;
      // Initialize the Quartz framework.
      Quartz.instance.toString();

      // Display the dialog.
     IKPictureTaker pictureTaker = IKPictureTaker.MYCLASS.pictureTaker();
     NSInteger result = pictureTaker.runModal();

     if (result.intValue() == 0) // NSCancelButton
     {
        System.out.println("User cancelled.");
     }
     else
     {
        assert result.intValue() == 1; // NSOKButton
        System.out.println("User chose an image.");
     }

     pool.release();
   }
}

这是我第一次在java中进行任何命令行编译,所以我认为可能是链接器错误来自于此但我不确定。谁能给我一个关于这里会发生什么的暗示?

P.S。可能很重要的是要注意,在发生此错误之前,Cocoa应用程序会弹出一个空窗口,但是没有内容。

1 个答案:

答案 0 :(得分:1)

不确定你的一行类是什么(这是正在加载的库),但我认为这就是你的问题所在。我通过确保加载Quartz来实现它的工作:

public interface IKPictureTaker extends NSObject {

    Library quartzINSTANCE = (Library) Native.loadLibrary("Quartz", Library.class);
    //...

}

public class IKPictureTakerTest extends JFrame {

   //...

   //QTKit instance = QTKit.instance;

   //Quartz.instance.toString();

   //...

}