FULL PRODUCT VERSION :
java version "1.8.0_20-ea"
Java(TM) SE Runtime Environment (build 1.8.0_20-ea-b23)
Java HotSpot(TM) 64-Bit Server VM (build 25.20-b22, mixed mode)

A DESCRIPTION OF THE PROBLEM :
Let there be an non-static inner class with a constructor which has a generic parameter type. Invoking toString() on a j.l.r.Parameter instance representing this parameter fails with an ArrayIndexOutOfBoundsException. As of 1.8.0_20-ea-b23, also Parameter#getAnnotatedType() is effected.

I believe this is related to issue https://bugs.openjdk.java.net/browse/JDK-5087240. I'm creating this separate issue as also getAnnotatedType() is concerned and now not only user code invoking Constructor#getGenericParameterTypes() is affected, but JDK code itself which invokes this method.

Note that getAnnotatedType() used to work as of 1.8.0_11 (the implementation of Executable#getAnnotatedParameterTypes() has changed since then and now also uses getGenericParameterTypes()).


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
public class ParameterBug {

public static void main(String[] args) throws Exception {
Constructor<MyEntity> constructor = MyEntity.class.getConstructor( ReflectionBug.class, Set.class );
for ( Parameter parameter : constructor.getParameters() ) {
// the following line raises an AIOOBE for the second parameter
System.out.println( parameter.toString() );

// this fails as well
System.out.println( parameter.getAnnotatedType() );
}
}

public class MyEntity {
public MyEntity(Set<?> names) {
}
}
}
---------- END SOURCE ----------