This code is on about line 3119 of Component.java

        public void show() {
            if (backBuffers == null) {
                return;
            }
            Graphics g = getGraphics();
            for (int i = 0; i < backBuffers.length; i++) {
                g.drawImage(backBuffers[i], 0, 0, Component.this);
                g.dispose();
                g = backBuffers[i].getGraphics();
            }
            g.dispose();
        }


We need to wrap the Graphics we get from getGraphics and createGraphics
calls in a try/finally block to explicitly dispose them in case of an
exception. I suggest:

            try {
                for (int i = 0; i < backBuffers.length; i++) {
                    g.drawImage(backBuffers[i], 0, 0, Component.this);
                    g.dispose();
                    g = null;
                    g = backBuffers[i].getGraphics();
                }
            } finally {
                if (g != null) {
                    g.dispose();
                }
            }