Abstract: Middleware systems provide essential support for modern business applications．However,the development of Internet makes the application environment open and dynamic,which requires the application to be dynamically adaptable．Mainstream middleware systems support hot deployment only but cannot ensure system consistency during and after system updating．ConUp is a SCA middleware that supports safe and efficient dynamic component updating．This tool demo exhibits the process of dynamic component updating with ConUp,the capability of using different algorithms and the advantages in ensuring system consistency,update timeliness,and low disruption to application execution.

Key words: Dynamic update,Service component architecture,Middleware,Component-based distributed system