1 /*
2  * Copyright 2016 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.Constructor;
18 import java.lang.reflect.InvocationHandler;
19 import java.lang.reflect.Method;
20 import java.lang.reflect.Proxy;
21 
22 /**
23  * Tests proxies when used with constructor methods.
24  */
25 class ConstructorProxy implements InvocationHandler {
main()26   public static void main() {
27     try {
28       new ConstructorProxy().runTest();
29     } catch (Exception e) {
30       System.out.println("Unexpected failure occured");
31       e.printStackTrace(System.out);
32     }
33   }
34 
runTest()35   public void runTest() throws Exception {
36     Class<?> proxyClass = Proxy.getProxyClass(
37             getClass().getClassLoader(),
38             new Class<?>[] { Runnable.class }
39     );
40     Constructor<?> constructor = proxyClass.getConstructor(InvocationHandler.class);
41     System.out.println("Found constructor.");
42     // We used to crash when asking the exception types of the constructor, because the runtime was
43     // not using the non-proxy ArtMethod
44     Object[] exceptions = constructor.getExceptionTypes();
45     System.out.println("Found constructors with " + exceptions.length + " exceptions");
46   }
47 
48   @Override
invoke(Object proxy, Method method, Object[] args)49   public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
50     return args[0];
51   }
52 }
53 
54