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

rev 49654 : 8199852: Print more information about class loaders in LinkageErrors.

*** 33,60 ****
   * @run main/othervm Test
   */
  
  public class Test {
  
      // 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();
          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());
              }
          }
      }
  }
--- 33,107 ----
   * @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 instance of PreemptingClassLoader " +
+         "(parent: \"app\" jdk.internal.loader.ClassLoaders$AppClassLoader) " +
+         "for super interface test.I, and the class loader \"app\" " +
+         "(instance of jdk.internal.loader.ClassLoaders$AppClassLoader, " +
+         "parent: \"platform\" jdk.internal.loader.ClassLoaders$PlatformClassLoader) " +
+         "of the selected method's type, test.J have different Class objects for the type test.Foo used in the signature";
+ 
      // Test that the error message is correct when a loader constraint error is
      // detected during itable creation.
      //
      // In this test, during itable creation for class C, method "m()LFoo;" for
      // C's super interface I has a different class Foo than the selected method's
      // type super interface J.  The selected method is not an overpass method nor
      // otherwise excluded from loader constraint checking.  So, a LinkageError
      // exception should be thrown because the loader constraint check will fail.
!     public static void test1() throws Exception {
!         Class<?> c = test.Foo.class; // forces standard class loader to load Foo
!         ClassLoader l = new PreemptingClassLoader("test.Task", "test.Foo", "test.C", "test.I");
!         Runnable r = (Runnable) l.loadClass("test.Task").newInstance();
          try {
              r.run();
              throw new RuntimeException("Expected LinkageError exception not thrown");
          } catch (LinkageError e) {
!             String errorMsg = e.getMessage();
!             if (!errorMsg.equals(expectedErrorMessage1)) {
!                 System.out.println("Expected: " + expectedErrorMessage1 + "\n" +
!                                    "but got:  " + errorMsg);
!                 throw new RuntimeException("Wrong LinkageError exception thrown: " + errorMsg);
              }
+             System.out.println("Passed with message: " + errorMsg);
          }
      }
+ 
+     static String expectedErrorMessage2 =
+         "loader constraint violation in interface itable initialization for class test.C: " +
+         "when selecting method test.I.m()Ltest/Foo; the class loader \"ItableLdrCnstrnt_Test_Loader\" " +
+         "(instance of PreemptingClassLoader, parent: \"app\" " +
+         "jdk.internal.loader.ClassLoaders$AppClassLoader) for super interface test.I, " +
+         "and the class loader \"app\" (instance of jdk.internal.loader.ClassLoaders$AppClassLoader, " +
+         "parent: \"platform\" jdk.internal.loader.ClassLoaders$PlatformClassLoader) " +
+         "of the selected method's type, test.J have different Class objects for the type test.Foo used in the signature";
+ 
+     // Same as test1, but ClassLoader has a name.
+     public static void test2() 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("ItableLdrCnstrnt_Test_Loader", classNames);    
+         Runnable r = (Runnable) l.loadClass("test.Task").newInstance();
+         try {
+             r.run();
+             throw new RuntimeException("Expected LinkageError exception not thrown");
+         } catch (LinkageError e) {
+             String errorMsg = e.getMessage();
+             if (!errorMsg.equals(expectedErrorMessage2)) {
+                 System.out.println("Expected: " + expectedErrorMessage2 + "\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 {
+         test1();
+         test2();
+     }
+         
  }