google/j2objc
Mar 2026 – Jun 2026
4 Months active
Languages Used
JavaObjective-C
Technical Skills
Annotation ProcessingInteroperabilityJavaKotlinObjective-CCode Refactoring
Wei Jun Kong
PROFILE
Wei Jun Kong
Worked on the google/j2objc repository to enhance cross-language interoperability between Java, Objective-C, and Kotlin/Native, focusing on adapter generation and collection conversion. Developed annotation-driven Objective-C adapter methods that automate translation between native and Java collections, reducing manual boilerplate and improving integration reliability. Improved the J2ObjC translation pipeline by expanding support for static methods, generics, and abstract type handling, while introducing composable converters for parameterized collections in the AST translator. Leveraged skills in AST manipulation, annotation processing, and functional programming to strengthen adapter extensibility, maintainability, and test coverage, enabling more robust and accurate iOS/macOS ports of Java codebases.
Overall Statistics
Feature vs Bugs
100%Features
Repository Contributions
12Total
Bugs
0
Commits
12
Features
6
Lines of code
3,911
Activity Months4
Your Network
4972 peopleSame Organization
@google.com4953
Benedict OdaiMember
Craig IngramMember
KayyuriMember
Scott SuarezMember
Agent2Agent (A2A) BotMember
Andreas AbelMember
Aadi KapurMember
Aadish GoelMember
Aahil MehtaMember
Work History
June 2026
1 Commits • 1 Features
Jun 1, 2026June 2026 monthly summary for google/j2objc focusing on features and business impact. Delivered a major feature: composable collection conversions in the J2ObjC AST translator, enabling composable converters that can accept multiple converter functions for parameterized collection types. This advances the adapter generation process by allowing composition of multiple regular and composable converters during code generation. Impact and scope: - Improved adapter generation accuracy and flexibility for parameterized types, reducing manual boilerplate and potential errors in cross-language bindings. - Strengthened the converter pipeline by enabling composition at AdapterLookup and ObjectiveCKmpMethodTranslator stages, improving maintainability and extensibility. - Provided a path to extend conversions with additional converter functions without modifying core generation logic. Notes: - Commit reference: 5597dec969db6137765711b8b2a9ac81397617e3 - PiperOrigin-RevId: 937367341
1 Commits • 1 Features
Jun 1, 2026June 2026 monthly summary for google/j2objc focusing on features and business impact. Delivered a major feature: composable collection conversions in the J2ObjC AST translator, enabling composable converters that can accept multiple converter functions for parameterized collection types. This advances the adapter generation process by allowing composition of multiple regular and composable converters during code generation. Impact and scope: - Improved adapter generation accuracy and flexibility for parameterized types, reducing manual boilerplate and potential errors in cross-language bindings. - Strengthened the converter pipeline by enabling composition at AdapterLookup and ObjectiveCKmpMethodTranslator stages, improving maintainability and extensibility. - Provided a path to extend conversions with additional converter functions without modifying core generation logic. Notes: - Commit reference: 5597dec969db6137765711b8b2a9ac81397617e3 - PiperOrigin-RevId: 937367341
June 2026
May 2026
2 Commits • 2 Features
May 1, 2026May 2026 highlights: Implemented serialization support for JREImmutableJavaSet and JREImmutableJavaMap via NSCoder, with unit tests, enabling persistence and cross-process data exchange for immutable collections. Reworked abstract type handling in J2ObjC mapping and adapters with a new MappingStrategy, refactoring AdapterContext and AdapterGenerator, and updated tests to validate concrete-subclass adapters and generics. Minor robustness improvements, including skipping package-info types in endVisit to avoid override-check errors. These changes improve interoperability with iOS clients and strengthen the adapter generation pipeline.
May 2026
2 Commits • 2 Features
May 1, 2026May 2026 highlights: Implemented serialization support for JREImmutableJavaSet and JREImmutableJavaMap via NSCoder, with unit tests, enabling persistence and cross-process data exchange for immutable collections. Reworked abstract type handling in J2ObjC mapping and adapters with a new MappingStrategy, refactoring AdapterContext and AdapterGenerator, and updated tests to validate concrete-subclass adapters and generics. Minor robustness improvements, including skipping package-info types in endVisit to avoid override-check errors. These changes improve interoperability with iOS clients and strengthen the adapter generation pipeline.
April 2026
8 Commits • 2 Features
Apr 1, 2026In April 2026, the J2ObjC translation pipeline was enhanced to improve accuracy, broaden API coverage, and support more Java constructs in generated Objective-C, driving higher-quality iOS/macOS ports and reducing manual adjustments. Key areas include method translation, primitives and generics handling, constructor support, and improved type casting and mappings; plus expanded collection translation via JreCollectionAdapter for Sets and Maps.
8 Commits • 2 Features
Apr 1, 2026In April 2026, the J2ObjC translation pipeline was enhanced to improve accuracy, broaden API coverage, and support more Java constructs in generated Objective-C, driving higher-quality iOS/macOS ports and reducing manual adjustments. Key areas include method translation, primitives and generics handling, constructor support, and improved type casting and mappings; plus expanded collection translation via JreCollectionAdapter for Sets and Maps.
April 2026
March 2026
1 Commits • 1 Features
Mar 1, 2026March 2026 monthly summary for google/j2objc. Key feature delivered: Objective-C Interop Adapter with Kotlin/Native. Implemented the @ObjectiveCKmpMethod annotation to generate adapter methods that enable interoperability between Java and Kotlin/Native. Adapter methods convert native Objective-C collections (NSArray, NSDictionary, NSSet) to Java collections (List, Map, Set) before invoking the original Java methods, and convert results back to Objective-C collections for seamless cross-platform calls. The work includes generation of peer @adapter methods in transpiled J2ObjC classes/interfaces and requires specifying an Objective-C selector and an adapter class. Commit: e8db8834f86fcfd9eb6dc34e1d2227999c254b13.
March 2026
1 Commits • 1 Features
Mar 1, 2026March 2026 monthly summary for google/j2objc. Key feature delivered: Objective-C Interop Adapter with Kotlin/Native. Implemented the @ObjectiveCKmpMethod annotation to generate adapter methods that enable interoperability between Java and Kotlin/Native. Adapter methods convert native Objective-C collections (NSArray, NSDictionary, NSSet) to Java collections (List, Map, Set) before invoking the original Java methods, and convert results back to Objective-C collections for seamless cross-platform calls. The work includes generation of peer @adapter methods in transpiled J2ObjC classes/interfaces and requires specifying an Objective-C selector and an adapter class. Commit: e8db8834f86fcfd9eb6dc34e1d2227999c254b13.
Activity
Loading activity data...
Quality Metrics
Correctness91.6%
Maintainability81.6%
Architecture86.8%
Performance81.6%
AI Usage26.6%
Skills & Technologies
Programming Languages
JavaObjective-C
Technical Skills
AST manipulationAnnotation ProcessingCode RefactoringCode TranslationCompiler DesignFunctional programmingInteroperabilityJavaJava InteroperabilityKotlinObject-Oriented ProgrammingObjective-CSoftware DesignSoftware DevelopmentSoftware Translation
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline