1 /*
   2  * Copyright (c) 2011 SAP SE. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 /*
  25  * @test SpreadNullArg
  26  * @bug 7141637
  27  * @summary  verifies that the MethodHandle spread adapter can gracefully handle null arguments.
  28  * @run main SpreadNullArg
  29  * @author volker.simonis@gmail.com
  30  */
  31 
  32 import java.lang.invoke.MethodHandle;
  33 import java.lang.invoke.MethodHandles;
  34 import java.lang.invoke.MethodType;
  35 
  36 public class SpreadNullArg {
  37 
  38   public static void main(String args[]) {
  39 
  40     MethodType mt_ref_arg = MethodType.methodType(int.class, Integer.class);
  41     MethodHandle mh_spreadInvoker = MethodHandles.spreadInvoker(mt_ref_arg, 0);
  42     MethodHandle mh_spread_target;
  43     int result = 42;
  44 
  45     try {
  46       mh_spread_target =
  47         MethodHandles.lookup().findStatic(SpreadNullArg.class, "target_spread_arg", mt_ref_arg);
  48       result = (int) mh_spreadInvoker.invokeExact(mh_spread_target, (Object[]) null);
  49       throw new Error("Expected IllegalArgumentException was not thrown");
  50     } catch (IllegalArgumentException e) {
  51       System.out.println("Expected exception : " + e);
  52     } catch (Throwable e) {
  53       throw new Error(e);
  54     }
  55 
  56     if (result != 42) {
  57       throw new Error("result [" + result
  58         + "] != 42 : Expected IllegalArgumentException was not thrown?");
  59     }
  60   }
  61 
  62   public static int target_spread_arg(Integer i1) {
  63     return i1.intValue();
  64   }
  65 
  66 }