Google Web Toolkit

Thursday, September 3, 2026

Re: GWt TeaVM comparison

I looked at GraalVM as a JVM replacement, but it wouldn't work with the libraries I use (Google Datastore mainly). I didn't realise it could also be used to compile WebAssembly. Thanks, will check it out!

Will also check out J2CL for Web Assembly. Publish the plugin! :-D

On Friday, 4 September 2026 at 1:36:53 pm UTC+10 Dmitrii Tikhomirov wrote:

You can use GraalVM to compile Java to WebAssembly.

The main limitation is multithreading; almost everything else works.

If you need a very small WASM binary, you can use J2CL.

I’ve actually already added WASM support to the j2cl-maven-plugin, but I still haven’t gotten around to publishing it.

On Sep 3, 2026, at 8:31 PM, Craig Mitchell <ma...@craig-mitchell.com> wrote:

Do you use it to compile to JavaScript or WebAssembly?

I'd love to compile Java to WebAssembly, but I'm too nervous about the edge cases.

On Friday, 4 September 2026 at 7:43:09 am UTC+10 Tim Macpherson wrote:

Maybe interesting for some:

.

I'm using TeaVM. Main problem is source map debugging will usually descend into transpiled js, GWT doesn't have that problem otherwise ok it it lasts.

Yahoo Mail: Search, Organize, Conquer

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Re: GWt TeaVM comparison

You can use GraalVM to compile Java to WebAssembly.

The main limitation is multithreading; almost everything else works.

If you need a very small WASM binary, you can use J2CL.

I’ve actually already added WASM support to the j2cl-maven-plugin, but I still haven’t gotten around to publishing it.

On Sep 3, 2026, at 8:31 PM, Craig Mitchell <mail@craig-mitchell.com> wrote:

Do you use it to compile to JavaScript or WebAssembly?

I'd love to compile Java to WebAssembly, but I'm too nervous about the edge cases.

On Friday, 4 September 2026 at 7:43:09 am UTC+10 Tim Macpherson wrote:

Maybe interesting for some:

.

I'm using TeaVM. Main problem is source map debugging will usually descend into transpiled js, GWT doesn't have that problem otherwise ok it it lasts.

Yahoo Mail: Search, Organize, Conquer

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Re: GWt TeaVM comparison

Do you use it to compile to JavaScript or WebAssembly?

I'd love to compile Java to WebAssembly, but I'm too nervous about the edge cases.

On Friday, 4 September 2026 at 7:43:09 am UTC+10 Tim Macpherson wrote:

Maybe interesting for some:

.

I'm using TeaVM. Main problem is source map debugging will usually descend into transpiled js, GWT doesn't have that problem otherwise ok it it lasts.

Yahoo Mail: Search, Organize, Conquer

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GWt TeaVM comparison

Maybe interesting for some:

I'm using TeaVM. Main problem is source map debugging will usually descend into transpiled js, GWT doesn't have that problem otherwise ok it it lasts.

Yahoo Mail: Search, Organize, Conquer

Monday, August 3, 2026

Does GWT support CSP Trusted Types?

Hi everyone,

We're trying to implement Trusted Types (require-trusted-types-for 'script') in a GWT 2.13 application as part of CSP hardening.

We created a default Trusted Types policy, but when Trusted Types is enforced, the application fails during startup because the GWT-generated bootstrap code triggers TrustedScript/TrustedScriptURL violations.

Has anyone successfully implemented Trusted Types with GWT? Is there any official support or recommended approach for this?

Thanks in advance!

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Tuesday, July 14, 2026

Re: Apache commons-text security issues

Hi Mirza,

this is not a production jar as Colin pointed out.

So if you are using the owasp plugin to find these, you can safely add this library to the owasp exclusions list - or setup you plugin/project so that you only scan libraries used in your deployable product.

rg,

Leon.

On Tuesday, 14 July 2026 at 16:45:21 UTC+2 Mirza Hadžič wrote:

Hello,

note that commons-text 1.9 used in gwt-user is having security issues,
so please upgrade this library to newer version if possible. This jar is
used by net.sourceforge.htmlunit library.

Cheers,

Mirza

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Re: Apache commons-text security issues

Thanks for calling this out - however, the gwt-user dependency should never be on your runtime classpath, but only used when you compile/test/debug code for your project, so the scope her is limited.

Oddly, the non-maven build of GWT doesn't appear to include commons-text, I wonder if that is an oversight of the ant build, or if the dependency can simply be excluded.

I've filed https://github.com/gwtproject/gwt/issues/10370 to track this.

On Tuesday, July 14, 2026 at 9:45:21 AM UTC-5 had...@digitech.cz wrote:

Hello,

note that commons-text 1.9 used in gwt-user is having security issues,
so please upgrade this library to newer version if possible. This jar is
used by net.sourceforge.htmlunit library.

Cheers,

Mirza

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