Grid computing and distributed systems provide great computational power at a low cost. Loosely-coupled parallel applications, such as Bag-of-Tasks applications are well-suited for these heterogeneous systems. A large number of applications could make use of the Bag-of-Tasks approach: data mining, simulations, massive research, image processing, fractal calculations, computational biology. This paper presents a fault-tolerant framework for Bag-of-Tasks applications using the Jini and JavaSpaces technologies. The main goal of this project is to supply a complete and fault tolerant framework that offers a simple interface for bag-of-tasks applications.