manifold-systems/manifold

Health v2 · maintenance only

Flags: no_releases

Adoption not part of the score

2759 stars · 133 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

Manifold is a Java compiler plugin that extends the Java language at compile time with features like extension methods, properties, operator overloading, templates, a preprocessor, and type-safe metaprogramming. It type-safely integrates schemas and DSLs such as SQL, JSON, YAML, XML, and GraphQL directly into Java code while remaining fully compatible with the JVM and existing Java tooling.

Use cases

• add extension methods and operator overloading to Java
• query SQL with type-safe generated code
• consume JSON and YAML schemas type-safely in Java
• write type-safe GraphQL queries in Java
• use a preprocessor for conditional compilation in Java
• add properties and optional parameters to Java
• compose objects with true parts-based composition

When to choose

• you want modern language features without leaving Java or the JVM
• you need type-safe access to SQL, JSON, YAML, XML, or GraphQL schemas
• you want to enhance an existing Java project incrementally
• you use IntelliJ IDEA or Android Studio and want IDE support for these features

When to avoid

• your team prefers standard Java without compiler plugins
• you are wary of tools relying on internal compiler APIs
• you are not using a supported JDK (8-25) or an IntelliJ-based IDE
• you would rather switch to a full alternative language like Kotlin

Facets

library · maturity active

compiler templating serialization parser developer-tools plugin-system programming-languages developer-tools compilers web-development apis jvm editor-plugin cross-platform java-compiler-plugin metaprogramming extension-methods operator-overloading type-safe-sql type-safe- graphql preprocessor structural-typing intellij-plugin android-studio

Member repositories

For agents

markdown · JSON · MCP: product_card(name="manifold-systems/manifold")