6847157: java.lang.NullPointerException: HDC for component at sun.jav…

…a2d.loops.Blit.Blit

Reviewed-by: prr

src/java.desktop/windows/native/libawt/java2d/windows/GDIWindowSurfaceData.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999, 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 2020, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -125,9 +125,14 @@ void SetupThreadGraphicsInfo(JNIEnv *env, GDIWinSDOps *wsdo) {
             // First, init the HDC object
             AwtComponent *comp = GDIWindowSurfaceData_GetComp(env, wsdo);
             if (comp == NULL) {
+                // wsdo->invalid is set by GDIWindowSurfaceData_GetComp
                 return;
             }
             hDC = comp->GetDCFromComponent();
+            if (hDC == NULL) {
+                wsdo->invalid = JNI_TRUE;
+                return;
+            }
             if (hDC != NULL && wsdo->device != NULL) {
                 ::SelectObject(hDC, nullbrush);
                 ::SelectObject(hDC, nullpen);

test/jdk/java/awt/Paint/RepaintOnAWTShutdown.java

@@ -0,0 +1,88 @@
+/*
+ * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+import java.awt.Dimension;
+import java.awt.FlowLayout;
+import java.awt.Graphics;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
+
+import javax.swing.JFrame;
+import javax.swing.JList;
+import javax.swing.JPanel;
+import javax.swing.JTable;
+import javax.swing.JTree;
+import javax.swing.SwingUtilities;
+
+/**
+ * @test
+ * @bug 6847157
+ * @key headful
+ * @summary the java2D/AWT should die silently without exceptions
+ * @run main/othervm                           RepaintOnAWTShutdown
+ * @run main/othervm -Dsun.java2d.uiScale=1    RepaintOnAWTShutdown
+ * @run main/othervm -Dsun.java2d.uiScale=1.2  RepaintOnAWTShutdown
+ * @run main/othervm -Dsun.java2d.uiScale=1.25 RepaintOnAWTShutdown
+ * @run main/othervm -Dsun.java2d.uiScale=1.5  RepaintOnAWTShutdown
+ * @run main/othervm -Dsun.java2d.uiScale=1.75 RepaintOnAWTShutdown
+ * @run main/othervm -Dsun.java2d.uiScale=2    RepaintOnAWTShutdown
+ * @run main/othervm -Dsun.java2d.uiScale=2.25 RepaintOnAWTShutdown
+ * @run main/othervm -Dsun.java2d.uiScale=5    RepaintOnAWTShutdown
+ * @run main/othervm -Dsun.java2d.uiScale=10   RepaintOnAWTShutdown
+ */
+public final class RepaintOnAWTShutdown implements Runnable {
+
+    private static final CountDownLatch go = new CountDownLatch(1);
+
+    public static void main(String[] args) throws Exception {
+        SwingUtilities.invokeLater(new RepaintOnAWTShutdown());
+        go.await(5, TimeUnit.SECONDS);
+        // The test will check that no exception is thrown when the jtreg will
+        // kill this test at the moment the frame will be painted
+    }
+
+    public void run() {
+        JFrame frame = new JFrame();
+        JPanel panel = new MyPanel();
+        panel.setPreferredSize(new Dimension(100, 100));
+        panel.setLayout(new FlowLayout());
+        panel.add(new JTree());
+        panel.add(new JList(new String[]{"one", "two"}));
+        panel.add(new JTable(new String[][]{{"one", "two"}},
+                             new String[]{"one", "two"}));
+        frame.add(panel);
+        frame.pack();
+        frame.setLocationRelativeTo(null);
+        frame.setVisible(true);
+        // the frame is not disposed intentionally
+    }
+
+
+    private final class MyPanel extends JPanel {
+
+        public void paint(Graphics g) {
+            super.paint(g);
+            go.countDown();
+        }
+    }
+}