{"id":54578,"library":"checker-compat-qual","title":"Checker Framework Compat Qualifiers","description":"Checker Qual is the set of annotations and supporting classes used by the Checker Framework for type checking Java source code.","status":"active","version":"2.5.6","language":"java","source_language":null,"source_url":"https://github.com/typetools/checker-framework","tags":["annotations","type-checking","null-safety","checker-framework"],"install":[{"cmd":"<dependency>\n  <groupId>org.checkerframework</groupId>\n  <artifactId>checker-compat-qual</artifactId>\n  <version>2.5.6</version>\n</dependency>","lang":"xml","label":"Maven"},{"cmd":"implementation 'org.checkerframework:checker-compat-qual:2.5.6'","lang":"groovy","label":"Gradle"}],"dependencies":[],"imports":[{"symbol":"Nullable","correct":"org.checkerframework.checker.nullness.qual.Nullable"}],"quickstart":{"code":"import org.checkerframework.checker.nullness.qual.Nullable;\n\npublic class Example {\n    public static void main(String[] args) {\n        @Nullable String s = null;\n        System.out.println(\"Nullable annotation used\");\n    }\n}","lang":"java","description":"Using the @Nullable annotation from Checker Framework."},"warnings":[{"fix":"Replace dependency with org.checkerframework:checker-qual.","message":"This artifact is deprecated; use org.checkerframework:checker-qual instead.","severity":"breaking","affected_versions":"*"}],"env_vars":null,"search_vec":"'annot':11,26 'check':22,29 'checker':1,5,18,34 'checker-framework':33 'class':14 'code':25 'compat':3 'framework':2,19,35 'java':23 'null':31 'null-safeti':30 'qual':6 'qualifi':4 'safeti':32 'set':9 'sourc':24 'support':13 'type':21,28 'type-check':27 'use':15","created_at":"2026-06-15T09:14:36.096554+00:00","updated_at":"2026-06-15T09:14:36.096554+00:00","problems":[],"ecosystem":"maven","meta_description":null,"install_score":null,"quickstart_score":null,"quickstart_tag":null,"pypi_latest":null,"cli_name":null,"cli_version":null,"type":"library","homepage":"https://checkerframework.org","github":"https://github.com/typetools/checker-framework","docs":"https://appdoc.app/artifact/org.checkerframework/checker-compat-qual/","changelog":null,"pypi":null,"npm":null,"openapi_spec":null,"status_page":null,"smithery":null,"categories":["utility"],"base_url":null,"auth_type":null,"provenance":{"verified_status":null,"verified_at":null,"last_verified":"2026-06-15","next_check":"2026-12-12","install_tag":null}}