JDK 9 RFR of 8175335: Improve handling of module types in javax.lang.model.util.Types

Alex Buckley alex.buckley at oracle.com
Wed Feb 22 02:35:34 UTC 2017

On 2/21/2017 5:37 PM, joe darcy wrote:
> Please review the small spec and implementation changes for
>      8175335: Improve handling of module types in
> javax.lang.model.util.Types
>      http://cr.openjdk.java.net/~darcy/8175335.0/
> which treats pseudo-types for modules similarly to the pseudo-types for
> packages.

Three specific comments:

- Types::erasure(TypeMirror) is one of the family. It should throw IAE 
on a module type as well as a package type.

- Types::getNoType(TypeKind) could say "To obtain a pseudo-type for 
packages or modules, call asType() on the result of 
Elements.getPackageElement(CharSequence) or 

- TypeMirror's spec fails to mention module types in "pseudo-types 
corresponding to packages and to the keyword void."

A general comment:

The methods in Types that throw IAE could be clarified. Where they now 
say "if given a type for an executable, package, or module", they really 
mean "if given a mirror that does not represent a suitable type for the 
operation". The Types spec could say "Utility methods for operating on 
types. Most methods operate on primitive types, reference types 
(including array types and the null type), intersection types, and the 
pseudo-type 'void'. Executable types and the pseudo-types for packages 
and modules are generally out of scope for these methods."


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