Increase Netty content length - JavaScript GWT SourceMap debug error

I'm working on a large corporate frontend solution developed using GWT.

When trying to debug using SuperDevMode, using the JavaScript debugger option and the IntelliJ extension for Chrome, the program execution (both in IntelliJ and Chrome) is correctly paused at the breakpoint. However after a few seconds the Chrome extension says it has crashed and program execution is resumed.

I've attached the log for IDEA, where you can see that Netty receives a message too large. Is it possible to increase this limit to overcome this issue?

https://gist.github.com/anonymous/5a4785472132edc61a2fc64cd9ef7c9c