MMO world in JAVA or C++

Question

What are the differences in developping an engine in JAVA than in C++ ? Would a massive number of actions coming from multiple clients be a problem for the Java Virtual Machine ? (still a newbie in game development)

Answer 1

Because,

Java is easier to learn/implement/use.
C++ is faster/powerful.

Java could probably handle what you need, but in terms of raw performance, it just can't compete with optimized C++ code. Use C++ if you're comfortable with the language.

Answer 2

Now I am defenitely going to concentrate on C++ !