I'm looking into rebuilding a server written in C++/Python in Java and
am after book recomendations that may help me during a prototype
phase.  I have basic knowledge and understand OO.  What I'm after is
something that covers networking, particularly with NIO.  I'm also
interesting in threading - the java way.

I am not interested in web development, JSP, servlets, etc.

My interest in JNI is to help me see if I can reuse some of the C++
code we already have, and to see what kind of migration path I can
take.  First being the main framework being written in Java calling
out to some C++, or keeping the current main framework in C++ and
building new modules in Java, eventually replacing the framework with
Java.

Any books fit the bill?  I've already prototyped a lot of what I'm
talking about, but am after more authoritative text on what the Java
way :)

Thanks.