The Checker Framework enhances Java's type system to make it more powerful and useful. This lets software developers detect and prevent errors in their Java programs.

Backport of the OpenJDK sandbox java.util.json API adapted for Java 21+. Experimental; APIs and behavior may change as upstream evolves.

Units of tool for class and class loading. Also with some tool type.

An unofficial backport of the JDK Classfile API to Java 17

framework-test contains utility classes for testing type-checkersthat are built on the Checker Framework.

Gradle plugin enabling JavaFX/TestFX integration tests on headless CI agents (Jenkins, GitHub Actions) with OpenJDK 8. Bundles OpenJFX native libraries (Linux x86_64) and pre-configures Monocle so tests run without a desktop JDK like Zulu FX.

Backport of the OpenJDK jdk-sandbox java.util.json sources adapted for Java 21+. Experimental and subject to change; not an official OpenJDK release.

Compares the OpenJDK sandbox java.util.json API to this Java 21 backport and reports differences to track upstream changes. Experimental tooling.

Runs the official JSON Test Suite against the java.util.json Java 21 backport to track conformance with JSON standards.

Experimental JSON Type Definition (JTD) validator built using the java.util.json Java 21 backport; implements RFC 8927 for code generation and portable validation.