1 /*
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   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
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   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
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  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
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  23 
  24 /**
  25  * @test
  26  * @bug 8199852
  27  * @summary Test exception messages of LinkageError with a parent class loader
  28  *          that is not known to the VM. A class loader loads
  29  *          twice the same class. Should trigger exception in
  30  *          SystemDictionary::check_constraints().
  31  * @compile ../common/Foo.java
  32  * @compile ../common/J.java
  33  * @compile ParentClassLoader.java
  34  *          PreemptingChildClassLoader.java
  35  * @run main/othervm Test
  36  */
  37 
  38 public class Test {
  39 
  40     // Check that all names have external formatting ('.' and not '/' in package names).
  41     // Check for parent of class loader.
  42     // Break expectedErrorMessage into 2 parts due to the class loader name containing
  43     // the unique @<id> identity hash which cannot be compared against.
  44 
  45     // Check that all names have external formatting ('.' and not '/' in package names).
  46     // Check for name and parent of class loader. Type should be mentioned as 'class'.
  47     static String expectedErrorMessage_part1 = "loader 'DuplicateParentLE_Test_Loader' @";
  48     static String expectedErrorMessage_part2 = " (instance of PreemptingChildClassLoader, child of ParentClassLoader @";
  49     static String expectedErrorMessage_part3 = " ParentClassLoader) attempted duplicate class definition for test.Foo";
  50 
  51     // Test that the error message is correct when a loader constraint error is
  52     // detected during vtable creation.
  53     //
  54     // In this test, during vtable creation for class Task, method "Task.m()LFoo;"
  55     // overrides "J.m()LFoo;".  But, Task's class Foo and super type J's class Foo
  56     // are different.  So, a LinkageError exception should be thrown because the
  57     // loader constraint check will fail.
  58     public static void test(String loaderName,
  59                             String testType) throws Exception {
  60         String[] classNames = {testType};
  61         ClassLoader l = new PreemptingChildClassLoader(loaderName, classNames, false);
  62         l.loadClass(testType);
  63         try {
  64             l.loadClass(testType).newInstance();
  65             throw new RuntimeException("Expected LinkageError exception not thrown");
  66         } catch (LinkageError e) {
  67             String errorMsg = e.getMessage();
  68             if (!errorMsg.contains(expectedErrorMessage_part1) ||
  69                 !errorMsg.contains(expectedErrorMessage_part2) ||
  70                 !errorMsg.contains(expectedErrorMessage_part3)) {
  71                 System.out.println("Expected: " + expectedErrorMessage_part1 + "<id>" + expectedErrorMessage_part2 + "<id>" + expectedErrorMessage_part3 + "\n" +
  72                                    "but got:  " + errorMsg);
  73                 throw new RuntimeException("Wrong LinkageError exception thrown: " + errorMsg);
  74             }
  75             System.out.println("Passed with message: " + errorMsg);
  76         }
  77     }
  78 
  79     public static void main(String args[]) throws Exception {
  80         test("DuplicateParentLE_Test_Loader", "test.Foo");
  81     }
  82 }