For our webapp the sweet spot has been Java/Tomcat for it's stability and security with python methods compiled into Java bytecode for regex and other methods t

For our webapp the sweet spot has been Java/Tomcat for it's stability and security with python methods compiled into Java bytecode for regex and other methods that are cumbersome in Java. The downside is that Jython throws more runtime exceptions. OTOH it has incentivized a ramp-up in unit testing (Maven, Selenium).