1 /*
2  * Copyright (C) 2008 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 import java.lang.reflect.InvocationHandler;
18 import java.lang.reflect.InvocationTargetException;
19 import java.lang.reflect.Method;
20 import java.lang.reflect.Proxy;
21 
22 /*
23  * Try to instantiate a proxy class with interfaces that have conflicting
24  * duplicate methods (primitive vs. object).
25  */
26 public class Clash {
main(String[] args)27     public static void main(String[] args) {
28         InvocationHandler handler = new ClashInvocationHandler();
29 
30         /* try passing in the same interface twice */
31         try {
32             Proxy.newProxyInstance(Clash.class.getClassLoader(),
33                 new Class<?>[] { Interface1A.class, Interface1A.class },
34                 handler);
35             System.out.println("Dupe did not throw expected exception");
36         } catch (IllegalArgumentException iae) {
37             System.out.println("Dupe threw expected exception");
38         }
39 
40         try {
41             Proxy.newProxyInstance(Clash.class.getClassLoader(),
42                 new Class<?>[] { Interface1A.class, Interface1B.class },
43                 handler);
44             System.out.println("Clash did not throw expected exception");
45         } catch (IllegalArgumentException iae) {
46             System.out.println("Clash threw expected exception");
47         }
48     }
49 }
50 
51 interface Interface1A {
thisIsOkay()52     public int thisIsOkay();
53 
thisIsTrouble()54     public float thisIsTrouble();
55 }
56 
57 interface Interface1B {
thisIsOkay()58     public int thisIsOkay();
59 
thisIsTrouble()60     public Object thisIsTrouble();
61 }
62 
63 class ClashInvocationHandler implements InvocationHandler {
64     /* don't really need to do anything -- should never get this far */
invoke(Object proxy, Method method, Object[] args)65     public Object invoke(Object proxy, Method method, Object[] args)
66         throws Throwable {
67 
68         return null;
69     }
70 }
71