Release 4.2.0 of the Checker Framework

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Suzanne Millstein

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Jun 1, 2026, 2:53:36 PM (9 days ago) Jun 1
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We have released a new version of the Checker Framework.
The Checker Framework lets you create and/or run pluggable type checkers, in order to detect and prevent bugs in your code.

You can find documentation and download links at:
https://CheckerFramework.org/

Changes for Checker Framework version 4.2.0:

Version 4.2.0 (2026-06-01)

User-visible changes

Renamed error message key "createsmustcallfor.target.unparseable" to "createsmustcallfor.target.unparsable".

Implementation details

In AnnotatedTypeFactory:

  • new overload canonicalAnnotation(AnnotationMirror, TypeMirror).

In TypeHierarchy:

  • new methods equalsShallowEffective().

Closed issues

#7676, #7679, #7680, #7695, #7697, #7699, #7700, #7727.

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