JDK: 7b70+
Platform: Windows, Solaris

The following simple code throws NPE:
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import javax.swing.*;
import java.awt.*;
public class AddNotify {
    public static void main(String[] args) {
        new JLayer<Button>(new Button()).addNotify();
    }
}
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On Windows:

Exception in thread "main" java.lang.NullPointerException: peer
at sun.awt.windows.WButtonPeer.create(Native Method)
at sun.awt.windows.WComponentPeer.<init>(WComponentPeer.java:719)
at sun.awt.windows.WButtonPeer.<init>(WButtonPeer.java:60)
at sun.awt.windows.WToolkit.createButton(WToolkit.java:331)
at java.awt.Button.addNotify(Button.java:177)
at java.awt.Container.addNotify(Container.java:2623)
at javax.swing.JComponent.addNotify(JComponent.java:4731)
at AddNotify.main(AddNotify.java:6)