A POS System is the hardware and software used to record the financial transactions of a retail store. 1  It is the best tool for a store owner to manage and assess her business. 2  Your POS system should alert you when you need to reorder and flag inventory that is dead in your store and not moving.
JPO is a framework for persistence (storage and retrieval) of domain (or data) objects in Java-based database applications. The object/relational impedence missmatch is widely regarded as a complex problem with no easy solution.
Non-blocking I/O (usually called NIO, and sometimes called New I/O) is a collection of Java programming language APIs that offer features for intensive I/O operations. It was introduced with the J2SE 1.4 release of Java by Sun Microsystems to complement an existing standard I/O.hannels (classes implementing the interface java.nio.channels.Channel) are designed to provide for bulk data transfers to and from NIO buffers. This is a low-level data transfer mechanism that exists in parallel with the classes of the higher-level I/O library (packages java.io and java.net).