Reported at: http://mail.openjdk.java.net/pipermail/awt-dev/2012-February/002240.html

Given a simple test case below[1], enableInputMethod(false) does not work. We can always invoke input method.
[1]
public class MyAWTTest extends JFrame {
    Component c;

    public MyAWTTest() {
    super("Single Frame --- AWT Frame");

    setLayout(new FlowLayout());

    c = new TextArea("TextArea component(No IM)");
    c.enableInputMethods(false);
    c.setPreferredSize(new Dimension(400, 100));
    add(c);

    c = new TextField("TextField component(No IM)", 52);
    c.enableInputMethods(false);
    add(c);

    setSize(850, 360);
    setVisible(true);

    setDefaultCloseOperation(EXIT_ON_CLOSE);
    }

    public static void main(String[] args) {
    SwingUtilities.invokeLater(new Runnable() {
        public void run() {
        new MyAWTTest();
        }
    });

    }
}