myappjar

myappjar is an open-source packaging framework for Java applications that bundles a JAR, a runtime, and dependencies into a single distribution artifact. It supports Windows, macOS, and Linux, producing native installers and portable archives. The goal is reproducible, secure, and easy deployment of Java software for both enterprise and consumer environments.

The project began in 2020 as an effort to standardize how Java applications are packaged across platforms. It has progressed through several releases with expanding installer backends and a formal descriptor format, and it is maintained by an open community of contributors.

Key features include a modular core engine, a descriptor describing metadata and dependencies, and options to bundle a runtime image or rely on a system JRE. It supports multiple target formats such as MSI, DMG, AppImage, DEB and RPM; offers digital signing, update capabilities, and a plugin system for extending functionality with code signing, updater integration, and native packaging backends.

The architecture separates the core packaging logic from backend installers. A small set of components handles manifest parsing, dependency resolution, and artifact assembly, while install backends generate platform-specific installers. It supports multi-arch bundles, reproducible builds, and integration with common build tools like Maven and Gradle.

Typical workflow: supply an application JAR and a descriptor file, then run the bundling command to produce a distribution. The result can be tested locally and deployed to distribution channels. Example workflow commands include: myappjar bundle --descriptor app.json --output dist/myappjar.

Usage has grown in mid-sized teams and open-source projects, with regular releases, documentation, and CI/CD integration. Some criticisms note a learning curve for new users and the potential increase in bundle size when including a runtime.

Within the Java packaging ecosystem, myappjar sits alongside tools such as jpackage and various native packaging formats, offering a higher-level abstraction for cross-platform Java deployment.