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test/hotspot/jtreg/runtime/LoaderConstraints/itableLdrConstraint/Test.java

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rev 49800 : 8199852: Print more information about class loaders in LinkageErrors.
Reviewed-by: dholmes

@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2017, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.

@@ -21,11 +21,11 @@
  * questions.
  */
 
 /*
  * @test
- * @bug 8186092
+ * @bug 8186092 8199852
  * @compile ../common/Foo.java
  *          ../common/J.java
  *          I.java
  *          ../common/C.jasm
  *          Task.java

@@ -33,28 +33,57 @@
  * @run main/othervm Test
  */
 
 public class Test {
 
+    static String expectedErrorMessage1 =
+        "loader constraint violation in interface itable initialization for class test.C: " +
+        "when selecting method test.I.m()Ltest/Foo; " +
+        "the class loader \"<unnamed>\" (instance of PreemptingClassLoader, " +
+        "child of \"app\" jdk.internal.loader.ClassLoaders$AppClassLoader) " +
+        "for super interface test.I, and the class loader \"app\" " +
+        "(instance of jdk.internal.loader.ClassLoaders$AppClassLoader) " +
+        "of the selected method's type, test.J have different Class objects " +
+        "for the type test.Foo used in the signature";
+
+    static String expectedErrorMessage2 =
+        "loader constraint violation in interface itable initialization for class test.C: " +
+        "when selecting method test.I.m()Ltest/Foo; " +
+        "the class loader \"ItableLdrCnstrnt_Test_Loader\" (instance of PreemptingClassLoader, " +
+        "child of \"app\" jdk.internal.loader.ClassLoaders$AppClassLoader) " +
+        "for super interface test.I, and the class loader \"app\" " +
+        "(instance of jdk.internal.loader.ClassLoaders$AppClassLoader) " +
+        "of the selected method's type, test.J have different Class objects " +
+        "for the type test.Foo used in the signature";
+
     // Test that the error message is correct when a loader constraint error is
     // detected during itable creation.
     //
     // 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 super interface J.  The selected method is not an overpass method nor
     // otherwise excluded from loader constraint checking.  So, a LinkageError
     // exception should be thrown because the loader constraint check will fail.
-    public static void main(String... args) throws Exception {
-        Class<?> c = Foo.class; // forces standard class loader to load Foo
-        ClassLoader l = new PreemptingClassLoader("Task", "Foo", "C", "I");
-        Runnable r = (Runnable) l.loadClass("Task").newInstance();
+    public static void test(String loaderName, String expectedErrorMessage) throws Exception {
+        Class<?> c = test.Foo.class; // Forces standard class loader to load Foo.
+        String[] classNames = {"test.Task", "test.Foo", "test.C", "test.I"};
+        ClassLoader l = new PreemptingClassLoader(loaderName, classNames);
+        Runnable r = (Runnable) l.loadClass("test.Task").newInstance();
         try {
             r.run();
             throw new RuntimeException("Expected LinkageError exception not thrown");
         } catch (LinkageError e) {
-            if (!e.getMessage().contains(
-                "loader constraint violation in interface itable initialization for class C:")) {
-                throw new RuntimeException("Wrong LinkageError exception thrown: " + e.getMessage());
+            String errorMsg = e.getMessage();
+            if (!errorMsg.equals(expectedErrorMessage)) {
+                System.out.println("Expected: " + expectedErrorMessage + "\n" +
+                                   "but got:  " + errorMsg);
+                throw new RuntimeException("Wrong LinkageError exception thrown: " + errorMsg);
             }
+            System.out.println("Passed with message: " + errorMsg);
         }
     }
+
+    public static void main(String... args) throws Exception {
+        test(null, expectedErrorMessage1);
+        test("ItableLdrCnstrnt_Test_Loader", expectedErrorMessage2);
+    }
 }
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