Compilation error: "length in Array is defined in an inaccessible class or interface"

Using javac in jdk7_b140.

Compilation error

NumberOfFocusListeners.java:14: error: length in Array is defined in an inaccessible class or interface
        return button.getListeners(listener.getClass()).length;
                                                       ^
1 error,


when trying to compile the following mini-test:

/********************************************************************/

import java.awt.Button;
import java.awt.event.FocusAdapter;
import java.awt.event.FocusListener;

public class NumberOfFocusListeners {

    public static void main(String[] args) {
        System.out.println(numberOfFocusListeners());
    }

    private static int numberOfFocusListeners() {
        FocusListener listener = new FocusAdapter(){};
        Button button = new Button();
        return button.getListeners(listener.getClass()).length;
    }
}

/********************************************************************/

Javac in jdk7_b140 (win x86, linux x86) cannot compile this code. Javac in jdk7_b139, jdk6_u25 and jdk6_u24 compiles it without problems. So, it seems like regression bug.
The following JCK test
api/javax_swing/plaf/metal/MetalComboBoxUI/index.html#public

won't be compiled with JDK7 b140 javac (with the default source/target options)



tests/api/javax_swing/plaf/metal/MetalComboBoxUI/publicTests.java:145: error: length in Array is defined in an inaccessible class or interface
                c.getFocusListener().getClass()).length;
                                                ^
tests/api/javax_swing/plaf/metal/MetalComboBoxUI/publicTests.java:151: error: length in Array is defined in an inaccessible class or interface
                c.getFocusListener().getClass()).length)) {
                                                ^