Annotation on lambda formal parameter?

Alex Buckley alex.buckley at
Tue Dec 11 16:27:23 PST 2012

Lambda EG,

JSR 308 "Annotations on Java Types" will allow annotations on the 
manifest type of a lambda expression's formal parameter, and on the type 
and/or type argument in a method/constructor reference expression.

Is there any interest in having 308 allow an annotation on a lambda 
formal parameter itself? That is, on the declaration of the parameter, 
rather than its type. A declaration annotation is conceptually valid 
even if the parameter declaration has no manifest type on which to write 
a type annotation.

This is somewhat in scope for 308 because it already allows annotations 
on declarations of type parameters (filling a hole from Java SE 5.0) and 
it has the sub-method-level class file attributes needed to store 
annotations on declarations of individual lambda parameters.


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