Ninflet is a Java-based global computing system that builds on our experiences with the Ninf system which facilitated RPC-based computing of numerical tasks in a wide-area network. The goal of Ninflet is to become a new generation of concurrent object-oriented system which harness abundant idle computing powers, and also seamlessly integrate global as well as local network parallel computing. Ninflet is designed to make use of Java features to implement important features in global computing, such as resource allocation, inter- Ninflet communication, security, checkpointing, object migration, and easy server management via HTTP.