"Best" is hard to define - what are your requirements?
If GWT doesn't fit your use cases, it seems unlikely that J2CL will - can you elaborate on what about GWT doesn't work for you? If anything, I've found J2CL to be more picky than GWT in just about every way - more limited options for emulation, more requirements for JsInterop, no JSNI/Generators, smaller ecosystem and prior art for customizing the build (whether using the maven plugin or the official Bazel build tooling).
It does tend to produce slightly smaller and slightly faster output, and does offer better integration with compiling plain JS sources in the same build (with the requirement that this JS must be built to be safe to compile by closure-compiler in ADVANCED mode).
For a generally bigger set of JRE emulation (and much larger output sizes), consider TeaVM or CheerpJ - both have their strengths. I don't have a lot of experience with either, but I do find that for math-heavy apps, TeaVM does a great job getting even better performance in some cases than GWT or J2CL, and produces output much more quickly. It tends to do much more poorly on string heavy (e.g. DOM manipulation). CheerpJ I have almost no experience with, but excels at supporting nearly any JRE-compatible code, and finding a way to make it work regardless of whether the browser is a good place to run it. This is a huge advantage for "it doesn't matter as long as it can run" cases - more and more it can be possible to run a JS app that is hundreds of times what would have been acceptable a few years ago.
On Saturday, December 27, 2025 at 12:08:38 PM UTC-6 tim_mac...@yahoo.co.uk wrote:
Can someone advise if it's the best tool for building js code from pure logic front end java ? I need to enable usage for those not using GWT. Thanks
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