J2cl: Transpile Java to JavaScript for Closure Compiler

J2CL closely follows the Java language semantics. J2CL is production ready and actively used by many of Google’s products, but the process of adapting workflows and tooling for the open-source version is not yet finalized and breaking changes will most likely be introduced. In early 2015, Google GWT team made a difficult but necessary decision to work on a new alternative product to enable Java for the Web.

Source: github.com