GTKPainterClass

void paintIcon(SynthContext context, Graphics g,
            Method paintMethod, int x, int y, int w, int h, Object direction) {
        int state = context.getComponentState();
        synchronized (UNIXToolkit.GTK_LOCK) {
            if (! ENGINE.paintCachedImage(g,
                    x, y, w, h, state, paintMethod, direction)) {
                ENGINE.startPainting(g,
                        x, y, w, h, state, paintMethod, direction);
                try {
                    paintMethod.invoke(this, context,
                            g, state, x, y, w, h, direction);
                } catch (IllegalAccessException iae) {
                    assert false;
                } catch (InvocationTargetException ite) {
                    assert false;
                }
                ENGINE.finishPainting();
            }
        }
    }

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package com.sun.java.swing.plaf.gtk;
GTKPainter.class

   void paintIcon(SynthContext context, Graphics g,
            Method paintMethod, int x, int y, int w, int h) {
        int state = context.getComponentState();
        synchronized (UNIXToolkit.GTK_LOCK) {
            if (! ENGINE.paintCachedImage(g, x, y, w, h, state, paintMethod)) {
                ENGINE.startPainting(g, x, y, w, h, state, paintMethod);
                try {
                    paintMethod.invoke(this, context, g, state, x, y, w, h);
                } catch (IllegalAccessException iae) {
                    assert false;
                } catch (InvocationTargetException ite) {
                    assert false;
                }
                ENGINE.finishPainting();
            }
        }
    }

// to ensure children are painted // this solves the AWT problem mentioned previously where a failure to invoke super.paint() prevented any lightweight children from appearing. => Avoiding system problems