[jira] [Created] (GROOVY-8236) Report more meaningful error for versions of Groovy not supporting @Repeatable

["Paul King (JIRA)" <ji...@apache.org>]

Paul King created GROOVY-8236:
---------------------------------

             Summary: Report more meaningful error for versions of Groovy not supporting @Repeatable
                 Key: GROOVY-8236
                 URL: https://issues.apache.org/jira/browse/GROOVY-8236
             Project: Groovy
          Issue Type: New Feature
         Environment: groovy 2.4.11
            Reporter: Dmitry Lukyanov


raised on stackoverflow: https://stackoverflow.com/questions/44532632/is-the-repeatable-annotation-not-supported-by-groovy/44628119#44628119

Problem: the following code in groovy 2.4.11 / java8

{code}
   @MyAnnotation(value = "val1")
   @MyAnnotation(value = "val2")
   void annotatedMethod() { println("annotated method called") }
{code}

should be compiled to this:
{code}
   @MyAnnotationArray({@MyAnnotation("val1"), @MyAnnotation("val2")})
   void annotatedMethod() { println("annotated method called") }
{code}

but actually compiled to this:
{code}
   @MyAnnotation(value = "val1")
   @MyAnnotation(value = "val2")
   void annotatedMethod() { println("annotated method called") }
{code}

The full groovy script to reproduce problem is below.
It throws exception: 
{color:red}java.lang.annotation.AnnotationFormatError: Duplicate annotation for class: interface MyAnnotation: @MyAnnotation(value=val2){color}

at line `List annos = m.getAnnotations()`


{code}
import java.lang.annotation.*

class MyClass 
{
    @MyAnnotation(value = "val1")
    @MyAnnotation(value = "val2")
    //change annotation to next line and the code will work
    //@MyAnnotationArray( [@MyAnnotation("val1"), @MyAnnotation("val2")] )
    public void annotatedMethod()
    {
      System.out.println("annotated method called");
    }
   public static void main(String... args)
   {
      MyClass ob = new MyClass()
      ob.annotatedMethod()
      java.lang.reflect.Method m = ob.getClass().getMethod("annotatedMethod")
      List annos = m.getAnnotations()
      println("annos = $annos")
   }
}

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
@Repeatable(MyAnnotationArray) 
public @interface MyAnnotation
{
    String value() default "val0";
}

@Retention(RetentionPolicy.RUNTIME)
public @interface MyAnnotationArray 
{
   MyAnnotation[] value()
}
{code}




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