java - can we do our own memory management?

Question

Is it possible to perform the memory management by yourself. e.g. We allocate a chunk of memory outside the heap space so that it is not subject to GC. And we ourselves take care of allocation/deallocation of objects from this chunk of memory.

Some people have pointed to frameworks like Jmalloc/EHcache. Actually i more want to understand that how they actually do it.

I am fine with some direct approach or even some indirect approach ( e.g. first serialize java objects).

Answer 1

You can not allocate Java objects in a foreign memory location, but you can map memory which is e.g. allocated in a native library into a direct ByteBuffer to use it from Java code.