Trinidad diagnostics let's you know the level of compatibility between your application and JRuby.

It uses JRuby lint under the hood to inspect your code before Trinidad starts up your application. Once your code is audited jruby-lint generates an html report that's located under your public directory, so you can access to it from a browser. I.e if the application path is / the report is located under /diagnostics.html.

Install the gem trinidad_diagnostics_extension or add it to your Gemfile.

Add the extension to the Trinidad's configuration file:

---
  extensions:
    diagnostics:

Or load it from the command line:

$ trinidad --load diagnostics

There is a debug mode that prints the results by the console log to. Add the option debug: true under the extension configuration or use the option --diagnostics-debug from the command line.