Can you show us the error you're getting with the crypto hack in place?

Let me uninstall Java and reinstall it hoping those 2 JARs go back to the original. I'll report back what I find.

Fresh install of Java 8 on Windows, move my warbler-created Rails WAR file over, run java -jar railsapp.war and load it up in the browser:

Illegal key size: possibly you need to install Java Cryptography Extension (JCE) Unlimited Strength Jurisdiction Policy Files for your JRE

Added the following code to initializers/java_crypto_patch.rb:

begin
  security_class = java.lang.Class.for_name('javax.crypto.JceSecurity')
  restricted_field = security_class.get_declared_field('isRestricted')
  restricted_field.accessible = true
  restricted_field.set nil, false
rescue java.lang.ClassNotFoundException
  puts "JCE security not available on this platform"
end

Ran warble executable war on the app again and moved it over to windows. Start the app, ....

And it works this time. Wow, now I wonder what caused the error before.

In any case, thanks for making me walk through it again, and sorry for wasting your time!

Thanks for confirming it at least! We always recommend latest JDK, so hopefully if there's any remaining problem it will fade with time.