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Jacob van Lingen

PROFILE

Jacob Van Lingen

Over the past nine months, this developer enhanced static analysis, migration safety, and build reliability across OpenRewrite and related repositories. They delivered features such as Jakarta EE migration safeguards and improved generics inference in Java, while refining static analysis recipes to support both Java and C#. Their work in repositories like openrewrite/rewrite-static-analysis and openrewrite/rewrite-migrate-java included robust dependency management, code refactoring, and test-driven development. By updating documentation in moderneinc/moderne-docs and uber/NullAway, they improved onboarding and clarified tool behavior. Their technical approach emphasized cross-language support, build automation, and maintainable code, resulting in more reliable CI and safer code transformations.

Overall Statistics

Feature vs Bugs

67%Features

Repository Contributions

23Total
Bugs
7
Commits
23
Features
14
Lines of code
4,244
Activity Months9

Work History

July 2026

1 Commits • 1 Features

Jul 1, 2026

July 2026 monthly summary for uber/NullAway focused on documentation improvements to reflect Lombok's default behavior of adding @lombok.Generated to generated code. Key change: README.md updated to document the new default behavior (Lombok v1.18.34) and its impact on generated-code detection and test coverage metrics, with notes for versions earlier than 1.18.34. No major bug fixes were required this month for this repository. Outcome: clearer developer guidance, reduced risk of misinterpreting test coverage, and better alignment with Lombok release notes.

August 2025

3 Commits • 2 Features

Aug 1, 2025

August 2025: Delivered targeted enhancements to OpenRewrite static analysis and Refaster build tooling across two repositories. Key features include enhanced RemoveRedundantTypeCast analysis for method invocations and return statements, including child classes and nested parentheses, with Kotlin files excluded to reduce noise; stabilized Refaster integration by switching to resources-based classpath resolution for dependencies during analysis. In rewrite-rewrite, added classpath resource handling, new dependency configurations, and compiler arguments to ensure resources are reliably located for Refaster during builds. These changes improved analysis accuracy, build stability, and CI reliability, delivering clear business value through higher code quality, faster feedback, and more maintainable tooling.

July 2025

3 Commits • 2 Features

Jul 1, 2025

July 2025: Delivered high-impact migration safety and code-quality improvements across two OpenRewrite projects. Key features include Jakarta Annotations Migration Safety with HasNoJakartaAnnotations precondition and conditional preservation of jakarta.annotation-api during Jakarta EE migrations, and improved generics inference for var usage in constructors by replacing JavaTemplate with a var identifier for better handling of wildcards, nested generics, and Java version constraints. A bug fix in Rewrite Static Analysis preserves indentation when finalizing private fields, with regression tests added. These changes reduce migration risk for customers, improve code generation fidelity, and enhance the developer experience during refactoring. Technologies demonstrated include migration safety patterns, var-based generics inference, code formatting stability, and cross-repo collaboration.

June 2025

2 Commits • 1 Features

Jun 1, 2025

June 2025 performance highlights: reliability and onboarding enhancements across two repositories. Implemented a guarded jax-ws runtime dependency addition with a new unit test to prevent accidental transitives in rewrite-migrate-java, and simplified Gradle setup by switching to latest.release for the Gradle Rewrite Plugin in rewrite-recipe-markdown-generator. These changes reduce build failures, improve reproducibility, and accelerate user adoption.

April 2025

1 Commits

Apr 1, 2025

April 2025 performance summary focusing on documentation accuracy and developer experience. Fixed a backslash typo in the MODERNE_AGENT_APIGATEWAYRSOCKETURI example in agent-config.md to ensure the environment variable example is syntactically correct; updated code samples to align with actual usage and prevent misconfiguration. Repository moderneinc/moderne-docs benefited from the improvement to onboarding and reduce support overhead.

March 2025

2 Commits • 2 Features

Mar 1, 2025

March 2025: Focused on strengthening the reliability and scope of testing recipes in openrewrite/rewrite-testing-frameworks. Delivered two feature enhancements with targeted Gradle project coverage and static-mocking improvements, plus expanded edge-case tests and lifecycle teardown, aligning with team quality goals and reducing future refactoring risk.

January 2025

2 Commits • 1 Features

Jan 1, 2025

In Jan 2025, I delivered significant robustness and correctness improvements for the rewrite-static-analysis component, focusing on stability of optional language modules and accuracy of multi-catch analysis. Key changes include refactoring the build to use the 'provided' scope for optional Groovy, Kotlin, and C# modules and adding runtime availability checks to prevent visiting absent compilation units. I also fixed the CatchClauseOnlyRethrows rule to correctly handle MultiCatch blocks in Java, including broader types and multiple blocks, with accompanying tests to ensure long-term correctness. These efforts reduce CI build failures, improve reliability of static analysis results, and lower maintenance costs for language-module integration.

December 2024

4 Commits • 2 Features

Dec 1, 2024

Monthly summary for 2024-12 focusing on delivering features, stabilizing code transformations, and strengthening test coverage in the openrewrite/rewrite-static-analysis project. Highlights include cross-language support improvements, safer transformation logic, and architectural refinements that drive business value and maintainability.

November 2024

5 Commits • 3 Features

Nov 1, 2024

November 2024 monthly summary focused on delivering safer migrations, conditional dependency removals, and language-aware static analysis across the OpenRewrite suite, plus documentation clarity to reduce test failures. Cross-repo work improved migration accuracy, dependency management safety, and language-context applicability, with targeted documentation updates to prevent Java-version related test issues.

Activity

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Quality Metrics

Correctness94.8%
Maintainability91.8%
Architecture91.8%
Performance86.0%
AI Usage26.0%

Skills & Technologies

Programming Languages

C#CSharpGradleGroovyJavaKotlinMarkdownXMLYAML

Technical Skills

Build AutomationBuild ConfigurationBuild Tool ConfigurationC# DevelopmentCSharp DevelopmentCode AnalysisCode GenerationCode MigrationCode RefactoringDependency ManagementDeveloper ToolsDocumentationGradleGroovy DevelopmentJUnit 5

Repositories Contributed To

10 repos

Overview of all repositories you've contributed to across your timeline

openrewrite/rewrite-static-analysis

Nov 2024 Aug 2025
5 Months active

Languages Used

CSharpJavaC#GroovyKotlin

Technical Skills

CSharp DevelopmentCode RefactoringJava DevelopmentStatic AnalysisC# DevelopmentCode Analysis

openrewrite/rewrite-migrate-java

Jun 2025 Jul 2025
2 Months active

Languages Used

GradleJavaYAMLGroovyXML

Technical Skills

Build Tool ConfigurationCode MigrationDependency ManagementJava DevelopmentBuild AutomationCode Analysis

moderneinc/moderne-docs

Nov 2024 Apr 2025
2 Months active

Languages Used

Markdown

Technical Skills

Documentation

openrewrite/rewrite-testing-frameworks

Mar 2025 Mar 2025
1 Month active

Languages Used

GroovyJava

Technical Skills

Build AutomationCode GenerationCode RefactoringGradleJUnit 5Java

openrewrite/rewrite-docs

Nov 2024 Nov 2024
1 Month active

Languages Used

JavaMarkdown

Technical Skills

Code RefactoringDocumentationJava

openrewrite/rewrite-spring

Nov 2024 Nov 2024
1 Month active

Languages Used

Java

Technical Skills

Code MigrationJavaRefactoringSpring FrameworkTesting

openrewrite/rewrite-java-dependencies

Nov 2024 Nov 2024
1 Month active

Languages Used

Java

Technical Skills

Build AutomationCode RefactoringDependency ManagementJavaTesting

openrewrite/rewrite-recipe-markdown-generator

Jun 2025 Jun 2025
1 Month active

Languages Used

GroovyKotlin

Technical Skills

Build ConfigurationPlugin Management

openrewrite/rewrite-rewrite

Aug 2025 Aug 2025
1 Month active

Languages Used

JavaKotlin

Technical Skills

Build ConfigurationGradleJava Development

uber/NullAway

Jul 2026 Jul 2026
1 Month active

Languages Used

Markdown

Technical Skills

JavaLombokdocumentation