1 files changed, 80 insertions, 0 deletions
diff --git a/test/java/util/Calendar/StampOverflow.java b/test/java/util/Calendar/StampOverflow.java
new file mode 100644
index 0000000000..fc10595c87
--- /dev/null
+++ b/test/java/util/Calendar/StampOverflow.java
@@ -0,0 +1,80 @@
+/*
+ * Copyright (c) 2001, 2016, 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.
+ */
+
+/*
+ * @test
+ * @bug 4404619 6348819
+ * @summary Make sure that Calendar doesn't cause nextStamp overflow.
+ */
+
+import java.lang.reflect.*;
+import java.util.*;
+import static java.util.Calendar.*;
+
+// Calendar fails when turning negative to positive (zero), not
+// positive to negative with nextStamp. If a negative value was set to
+// nextStamp, it would fail even with the fix. So, there's no way to
+// reproduce the symptom in a short time -- at leaset it would take a
+// couple of hours even if we started with Integer.MAX_VALUE. So, this
+// test case just checks that set() calls don't cause any nextStamp
+// overflow.
+
+public class StampOverflow {
+    public static void main(String[] args) throws IllegalAccessException {
+        // Get a Field for "nextStamp".
+        Field nextstamp = null;
+        try {
+            nextstamp = Calendar.class.getDeclaredField("nextStamp");
+        } catch (NoSuchFieldException e) {
+            throw new RuntimeException("implementation changed?", e);
+        }
+
+        nextstamp.setAccessible(true);
+
+        Calendar cal = new GregorianCalendar();
+        int initialValue = nextstamp.getInt(cal);
+        // Set nextStamp to a very large number
+        nextstamp.setInt(cal, Integer.MAX_VALUE - 100);
+
+        for (int i = 0; i < 1000; i++) {
+            invoke(cal);
+            int stampValue = nextstamp.getInt(cal);
+            // nextStamp must not be less than initialValue.
+            if (stampValue < initialValue) {
+                throw new RuntimeException("invalid nextStamp: " + stampValue);
+            }
+        }
+    }
+
+    static void invoke(Calendar cal) {
+        cal.clear();
+        cal.set(2000, NOVEMBER, 2, 0, 0, 0);
+        int y = cal.get(YEAR);
+        int m = cal.get(MONTH);
+        int d = cal.get(DAY_OF_MONTH);
+        if (y != 2000 || m != NOVEMBER || d != 2) {
+            throw new RuntimeException("wrong date produced ("
+                                       + y + "/" + (m+1) + "/" + d + ")");
+        }
+    }
+}