  This paper presents an integrity checker of JAVA P2P distributed system with
auto source code composition. JAVA distributed system must guarantee the
integrity of program itself and the system components of JAVA virtual machine
against attackers, hackers, spies, cheaters, conspirators, etc. There are lots
of trusted computing methods to guarantee the integrity of the system. We here
present a novel method using just-in-time auto source code composition to
generate autocheck class for integrity measure and encrypt of integrity
reporting.
  By companies' effort, we have implemented and use it in DSCloud platform.
