UnsatisfiedDependencyException

[sNIKE79]

My GUI shall open an modal JDialog. It works fine, when i hardcode this in Java. But when i use Spring i run into a UnsatisfiedDependencyException.
What went wrong?

public class MyGUI extends JFrame {
...
}

public class MyDialog extends JDialog {

   public MyDialog(java.awt.Frame parent) {
      super(parent, true);
      initComponents();
   }
   ...
}

MyGUI gui = new MyGUI();
...
MyDialog dialog = new MyDialog(gui);
...

Works fine, but with Spring ...

...
<bean id="myGUI" class="MyGUI" />

<bean id="myDialog" class="MyDialog">
   <constructor-arg ref="myGUI" />
</bean>
...

... i got:

java.lang.ExceptionInInitializerError
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'myDialog' defined in class path resource [content.xml]: Unsatisfied dependency expressed through constructor argument with index 0 of type [java.awt.Frame]: Could not convert constructor argument value [MyGUI[frame0,0,0,0x0,invalid,hidden,layout=java.awt.BorderLayout,title=,resizable,normal,defaultCloseOperation=HIDE_ON_CLOSE,rootPane=javax.swing.JRootPane[,0,0,0x0,invalid,layout=javax.swing.JRootPane$RootLayout,alignmentX=0.0,alignmentY=0.0,border=,flags=16777673,maximumSize=,minimumSize=,preferredSize=],rootPaneCheckingEnabled=true]] to required type [java.awt.Frame]: Failed to convert value of type [$Proxy0] to required type [java.awt.Frame]; nested exception is java.lang.IllegalArgumentException: Cannot convert value of type [$Proxy0] to required type [java.awt.Frame] for property 'null': no matching editors or conversion strategy found

[Marten Deinum]

For some reason your class gets proxied. Post the whole configuration for a detailed solution. The not so detailed solution is to enable class proxying. (proxyClass=true).