--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/langtools/test/tools/javac/generics/ParametricException.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,103 @@
+/*
+ * Copyright 2002 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+/*
+ * @test
+ * @bug 4509267
+ * @summary generics: parametric exception type versus overriding
+ * @author gafter
+ *
+ * @compile -source 1.5 ParametricException.java
+ */
+
+import java.io.*;
+
+abstract class AChurchBoolean {
+    public abstract <Return, Parameter, Throws extends Throwable>
+    Return accept(IVisitor<Return, Parameter, Throws> visitor, Parameter parameter) throws Throws;
+
+    public interface IVisitor<Return, Parameter, Throws extends Throwable> {
+        public Return caseTrue(Parameter parameter) throws Throws;
+        public Return caseFalse(Parameter parameter) throws Throws;
+    }
+}
+
+class TrueChurchBoolean extends AChurchBoolean {
+    private static TrueChurchBoolean instance = new TrueChurchBoolean();
+    private TrueChurchBoolean() {}
+    public static TrueChurchBoolean singleton() {
+        return instance;
+    }
+    public <Return, Parameter, Throws extends Throwable>
+    Return accept(IVisitor<Return, Parameter, Throws> visitor, Parameter parameter) throws Throws {
+        return visitor.caseTrue(parameter);
+    }
+}
+
+class FalseChurchBoolean extends AChurchBoolean {
+    private static FalseChurchBoolean instance = new FalseChurchBoolean();
+    private FalseChurchBoolean() {}
+    public static FalseChurchBoolean singleton() {
+        return instance;
+    }
+    public <Return, Parameter, Throws extends Throwable>
+    Return accept(IVisitor<Return, Parameter, Throws> visitor, Parameter parameter) throws Throws {
+        return visitor.caseFalse(parameter);
+    }
+}
+
+class Pair<T,U> {
+    private T first;
+    private U second;
+    Pair(T first, U second) {
+        this.first = first;
+        this.second = second;
+    }
+    T getFirst() {
+        return first;
+    }
+    U getSecond() {
+        return second;
+    }
+}
+
+// Perhaps a bit of a toy example, but relevant nonetheless.
+class ChurchBooleanTest {
+    private AChurchBoolean bool;
+    public ChurchBooleanTest(AChurchBoolean bool) {
+        this.bool = bool;
+    }
+    public AChurchBoolean readIf(File file, byte[] output) throws IOException {
+        return bool.accept(new AChurchBoolean.IVisitor<AChurchBoolean, Pair<File, byte[]>, IOException>() {
+            public AChurchBoolean caseTrue(Pair<File, byte[]> parameter) throws IOException {
+                FileInputStream input = new FileInputStream(parameter.getFirst()); // throws
+                input.read(parameter.getSecond()); // throws
+                input.close(); // throws
+                return TrueChurchBoolean.singleton();
+            }
+            public AChurchBoolean caseFalse(Pair<File, byte[]> parameter) throws IOException {
+                return FalseChurchBoolean.singleton();
+            }
+        }, new Pair<File, byte[]>(file, output));
+    }
+}