src/java.base/share/classes/sun/reflect/annotation/TypeAnnotationParser.java

*** 349,364 ****
      static Map<Class<? extends Annotation>, Annotation> mapTypeAnnotations(TypeAnnotation[] typeAnnos) {
          Map<Class<? extends Annotation>, Annotation> result =
              new LinkedHashMap<>();
          for (TypeAnnotation t : typeAnnos) {
              Annotation a = t.getAnnotation();
              Class<? extends Annotation> klass = a.annotationType();
              AnnotationType type = AnnotationType.getInstance(klass);
!             if (type.retention() == RetentionPolicy.RUNTIME)
!                 if (result.put(klass, a) != null)
                      throw new AnnotationFormatError("Duplicate annotation for class: "+klass+": " + a);
          }
          return result;
      }
  
      // Position codes
      // Regular type parameter annotations
--- 349,367 ----
      static Map<Class<? extends Annotation>, Annotation> mapTypeAnnotations(TypeAnnotation[] typeAnnos) {
          Map<Class<? extends Annotation>, Annotation> result =
              new LinkedHashMap<>();
          for (TypeAnnotation t : typeAnnos) {
              Annotation a = t.getAnnotation();
+             if (a != null) {
                  Class<? extends Annotation> klass = a.annotationType();
                  AnnotationType type = AnnotationType.getInstance(klass);
!                 if (type.retention() == RetentionPolicy.RUNTIME &&
!                     result.put(klass, a) != null) {
                      throw new AnnotationFormatError("Duplicate annotation for class: "+klass+": " + a);
                  }
+             }
+         }
          return result;
      }
  
      // Position codes
      // Regular type parameter annotations