test/jdk/java/awt/im/memoryleak/InputContextMemoryLeakTest.java

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 *
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * version 2 for more details (a copy is included in the LICENSE file that
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import java.awt.FlowLayout;
import java.awt.Robot;
import java.lang.ref.WeakReference;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
import test.java.awt.regtesthelpers.Util;

/*
 @test
 @key headful
 @bug 7079260
 @summary XInputContext leaks memory by needRecetXXIClient field
 @author Petr Pchelko
 @library ../../regtesthelpers
 @build Util
 @compile InputContextMemoryLeakTest.java
 @run main/othervm -Xmx20M InputContextMemoryLeakTest
 */
public class InputContextMemoryLeakTest {

    private static JFrame frame;
    private static WeakReference<JTextField> text;
    private static WeakReference<JPanel> p;
    private static JButton button;

    public static void init() throws Throwable {
        SwingUtilities.invokeAndWait(new Runnable() {
            @Override
            public void run() {
                frame = new JFrame();
                frame.setLayout(new FlowLayout());
                JPanel p1 = new JPanel();
                button = new JButton("Test");
                p1.add(button);
                frame.add(p1);
                JTextField tf = new JTextField("Text");
                text = new WeakReference<JTextField>(tf);
                JPanel jp = new JPanel(new FlowLayout());
                p = new WeakReference<JPanel>(jp);
                jp.add(tf);
                frame.add(jp);
                frame.setBounds(500, 400, 200, 200);
                frame.setVisible(true);
            }
        });

        Util.focusComponent(text.get(), 500);
        Util.clickOnComp(button, new Robot());
        //References to objects testes for memory leak are stored in Util.
        //Need to clean them
        Util.cleanUp();

        SwingUtilities.invokeAndWait(new Runnable() {
            @Override
            public void run() {
                // after this the JTextField as well as the JPanel
                // are eligible to be GC'd
                frame.remove(p.get());
            }
        });

        Util.waitForIdle(null);
        //After the next caret blink it automatically TextField references
        JTextField tf = text.get();
        if (tf != null) {
            Thread.sleep(tf.getCaret().getBlinkRate() * 2);
            tf = null; // allow to be GCed
        }
        Util.waitForIdle(null);

        try {
            assertGC();
        } finally {
            SwingUtilities.invokeAndWait(() -> frame.dispose());
        }
    }

      public static void assertGC() throws Throwable {
        List<byte[]> alloc = new ArrayList<byte[]>();
        int size = 1024 * 10;
        while (true) {
            try {
                alloc.add(new byte[size]);
            } catch (OutOfMemoryError err) {
                break;
            }
        }
        alloc = null;
        if (text.get() != null) {
            throw new Exception("Test failed: JTextField was not collected");
        }
    }

    public static void main(String args[]) throws Throwable {
        init();
    }
}