Q: controlled mem mgmt in Java

Java seem to be very single-minded in regard of memory allocation for
objects. This entails a huge run-time overhead when functions (OK,
methods) have a few local small objects, which I would allocate
directly on stack if I were using C/C++/etc. Java also does not allow
a programmer to use various free-store memory management techniques
for objects. For example, I like to use "arenas".


Today, as various Java machines claim they are closing up on compiled
C/C++ speed, this seem to be important. Programmable memory allocation
may not be possible due to security stuff, but built-in mem managers
are definitely possible. Is anyone working on/aware of any built-in
classes or language extensions coming up to allow controlled memory
management for objects in Java?
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