Test.java

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/*
 * @test
 * @bug 8186092
 * @compile ../common/Foo.java
 *          I.java
 *          ../common/J.java
 *          ../common/C.jasm
 *          Task.java
 *          ../common/PreemptingClassLoader.java
 * @run main/othervm Test
 */

public class Test {

    // Test that LinkageError exceptions are not thrown during itable creation,
    // for loader constraint errors, if the target method is an overpass method.
    //
    // In this test, during itable creation for class C, method "m()LFoo;" for
    // C's super interface I has a different class Foo than the selected method's
    // type J.  But, the selected method is an overpass method (that throws an
    // ICCE). So, no LinkageError exception should be thrown because the loader
    // constraint check that would cause the LinkageError should not be done.
    public static void main(String... args) throws Exception {
        Class<?> c = test.Foo.class; // forces standard class loader to load Foo
        ClassLoader l = new PreemptingClassLoader("test.Task", "test.Foo", "test.C", "test.I");
        Runnable r = (Runnable) l.loadClass("test.Task").newInstance();
        try {
            r.run(); // Cause an ICCE because both I and J define m()LFoo;
            throw new RuntimeException("Expected ICCE exception not thrown");
        } catch (IncompatibleClassChangeError e) {
            if (!e.getMessage().contains("Conflicting default methods: test/I.m test/J.m")) {
                throw new RuntimeException("Wrong ICCE exception thrown: " + e.getMessage());
            }
        }
    }
}