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Google Web Toolkit

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description Google Web Toolkit Overview

Google Web Toolkit (GWT) is an open-source Java framework that enables developers to build rich client-side web applications using Java and compile them into JavaScript for deployment across browsers.

help Google Web Toolkit FAQ

Is Google Web Toolkit still maintained?

Yes, though development is now community-driven under a GWT steering committee rather than led directly by Google. Releases have continued into the 2020s, including versions such as GWT 2.10 and later point releases.

What replaced GWT inside Google?

Google developed J2CL, a Java-to-Closure-Compiler JavaScript transpiler, which powers parts of major Google productivity apps and represents the company's internal evolution beyond GWT. GWT itself remains open source for external developers.

How does GWT turn Java into JavaScript?

GWT is a source-to-source compiler that translates your Java code into optimized JavaScript, backed by an emulated subset of the JRE. Older versions generated separate 'permutations' per browser, but modern GWT produces far fewer variants now that browsers have converged.

Can I write GWT client code in Kotlin or Scala?

In practice, no: the GWT compiler works from Java source, so client-side code must stick to the supported Java language subset and JRE emulation. Kotlin and Scala code generally can't be compiled by GWT, though there are separate Kotlin-to-JavaScript toolchains like Kotlin/JS for that purpose.

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