Why is Java EE scalable?

Question

I heard from various sources that Java EE is highly scalable, but to me it seems that you could never scale a Java EE application to the level of the google search engine or any

Answer 1

Java EE is considered scalable because if you consider the EJB architecture and run on an appropriate application server, it includes facilities to transparently cluster and allow the use of multiple instances of the EJB to serve requests.

If you managed things manually in plain-old-java, you would have to figure out all of this yourself, for example by opening ports, synchronizing states, etc.

I am not sure you could define Google as a "large website". That would be like likening the internet to your office LAN. Java EE was not meant to scale to the global level, which is why sites like Amazon and Google use their own technologies (e.g., with use of MapReduce).

There are many papers discussing the efficiency of Java EE scalability. For example this