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23 
24 /* @test
25  * @bug 8188240
26  * @summary This is a test to ensure that proxies do not try to intercept interface static methods.
27  *
28  * @build ProxyClashTest
29  * @run main ProxyClashTest
30  */
31 
32 import java.lang.reflect.Method;
33 import java.lang.reflect.Proxy;
34 import java.util.Observer;
35 
36 public class ProxyClashTest {
37 
38     public interface ClashWithRunnable {
run()39         static int run() { return 123; }
40 
foo()41         static void foo() {}
42     }
43 
main(String[] args)44     public static void main(String[] args) {
45         System.err.println(
46             "\nDynamic proxy API static method clash test\n");
47 
48         Class<?>[] interfaces =
49             new Class<?>[] { ClashWithRunnable.class, Runnable.class, Observer.class };
50 
51         ClassLoader loader = ProxyClashTest.class.getClassLoader();
52 
53         /*
54          * Generate a proxy class.
55          */
56         Class<?> proxyClass = Proxy.getProxyClass(loader, interfaces);
57         System.err.println("+ generated proxy class: " + proxyClass);
58 
59         for (Method method : proxyClass.getDeclaredMethods()) {
60             if (method.getName().equals("run") && method.getReturnType() == int.class) {
61                 throw new RuntimeException("proxy intercept a static method");
62             }
63             if (method.getName().equals("foo")) {
64                 throw new RuntimeException("proxy intercept a static method");
65             }
66         }
67 
68         System.err.println("\nTEST PASSED");
69     }
70 }
71