Flexible Dynamic Software Updates of Java Applications: Tool Support and Case Study
Software is changed frequently during its life cycle. New requirements come and bugs must be fixed. To update an application it usually must be stopped, patched, and restarted. This causes time periods of unavailability which is always a problem for highly available applications. Even for the development of complex applications restarts to test new program parts can be time consuming and annoying. Thus, the authors aim at dynamic software updates to update programs at runtime. There is a large body of research on dynamic software updates, but so far, existing approaches have shortcomings either in terms of flexibility or performance. In addition, some of them depend on specific runtime environments and dictate the program's architecture.