There is a hot dialog going over at The Server Side that starts with a Fisking of (PHP co-author) Andi Gutman's blog post "Java is losing the battle for the modern Web. Can the JVM save the vendors?". The basic premise of Andi's article is that, despite support for dynamic languages (Jython, JRuby, etc.), the JVM will have a hard time keeping up with the modern web's demands for flexibility, performance, and agility.
As one would expect on TSS, the audience is definitely biased toward Java and there is a fair share of "PHP programmers can't code." However, there are also plenty of well supported arguments in the comments too - even a little bit of introspection. No Springer-esque chair throwing but definitely worth a scan.