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  1. JDK
  2. JDK-8213905

Reflection, TYPE_USE annotation on THROWS on inner class constructor, Java 9+

    Details

    • Type: Bug
    • Status: Open
    • Priority: P4
    • Resolution: Unresolved
    • Affects Version/s: None
    • Fix Version/s: tbd
    • Component/s: core-libs
    • Labels:
      None

      Description

      When adding a TYPE_USE annotation with runtime retention to the throws exception clause of a constructor of an inner class, these annotations are not found via Constructor.getAnnotatedExceptionType().getDeclaredAnnotations() on Java 9+, but present when running on Java 8.
      For static nested classes, the annotations are correctly found on Java 9+.

      See sample code below.

      Looking in the .class file for the nested classes (with javap), the runtime annotation is present there:
        public app1.MiscTest8$Inner(app1.MiscTest8) throws java.lang.Exception;
          (...)
          RuntimeVisibleTypeAnnotations:
            0: #17(): THROWS, type_index=0
              app1.MiscTest8$MyAnnotation

      and
        public app1.MiscTest8$StaticInner() throws java.lang.Exception;
          (...)
          RuntimeVisibleTypeAnnotations:
            0: #14(): THROWS, type_index=0
              app1.MiscTest8$MyAnnotation

      When I run it on Java 8, I get the following output:
      === public app1.MiscTest8$Inner(app1.MiscTest8) throws java.lang.Exception ===
      [@app1.MiscTest8$MyAnnotation()]
      === public app1.MiscTest8$StaticInner() throws java.lang.Exception ===
      [@app1.MiscTest8$MyAnnotation()]
      === public static void app1.MiscTest8.main(java.lang.String[]) throws java.lang.Exception ===
      [@app1.MiscTest8$MyAnnotation()]

      But when I run the same class files on Java 9, 10, 11, (and 12-ea) I get:
      === public app1.MiscTest8$Inner(app1.MiscTest8) throws java.lang.Exception ===
      []
      === public app1.MiscTest8$StaticInner() throws java.lang.Exception ===
      [@app1.MiscTest8$MyAnnotation()]
      === public static void app1.MiscTest8.main(java.lang.String[]) throws java.lang.Exception ===
      [@app1.MiscTest8$MyAnnotation()]


      Shouldn't I be able to find this annotation vis getAnnotatedExceptionTypes() on Java9+, similar to how it works on Java 8?

      Kind regards
      Michael Rasmussen.


      /* --- snip --- */
      package app1;

      import java.lang.annotation.ElementType;
      import java.lang.annotation.Retention;
      import java.lang.annotation.RetentionPolicy;
      import java.lang.annotation.Target;
      import java.lang.reflect.AnnotatedType;
      import java.lang.reflect.Executable;
      import java.util.Arrays;

      public class MiscTest8 {

        @Retention(value = RetentionPolicy.RUNTIME)
        @Target(ElementType.TYPE_USE)
        @interface MyAnnotation {
        }

        class Inner {
          public Inner() throws @MyAnnotation Exception {
          }
        }

        static class StaticInner {
          public StaticInner() throws @MyAnnotation Exception {
          }
        }
        public static void main(String[] args) throws @MyAnnotation Exception {
          foo(Inner.class.getDeclaredConstructor(MiscTest8.class));
          foo(StaticInner.class.getDeclaredConstructor());
          foo(MiscTest8.class.getDeclaredMethod("main", String[].class));
        }

        static void foo(Executable c) throws Exception {
          System.out.println("=== " + c + " ===");

          for (AnnotatedType exceptionType : c.getAnnotatedExceptionTypes()) {
            System.out.println(Arrays.toString(exceptionType.getDeclaredAnnotations()));
          }
        }
      }
      /* --- snap --- */

      reported in core-libs: http://mail.openjdk.java.net/pipermail/core-libs-dev/2018-November/056536.html

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            • Assignee:
              vromero Vicente Arturo Romero Zaldivar
              Reporter:
              vromero Vicente Arturo Romero Zaldivar
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              • Created:
                Updated: