> At one time, the JVM had superior configurability - many more runtime options for aggressive garbage collection, profiling, optimization, and debugging. I'm

> At one time, the JVM had superior configurability - many more runtime options for aggressive garbage collection, profiling, optimization, and debugging. I'm not sure that this actually implies it was a more robust and production ready system. The JVM seems to be on a similar path of reducing somewhat how much tuning is expected of operators. Certainly we do less of it now on Java 8 (although some of the defaults it sets are truly boneheaded).