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The use of Java for distributed systems and highavailable applications demands the validation of their fault tolerance mechanisms to avoid unexpected behavior during execution. We present an extension of FIONA (Fault Injector Oriented to Network Applications), a fault injection environment to experimentally validate the dependability of distributed Java applications. The main features of this extension are: its distributed architecture, which allows centralized configuration of multiple faults scenarios, and the support for a wider fault model associated with distributed systems, which includes network partitioning. For monitoring, FIONA supports the collection of log information and includes a helper application to integrate this information in a global log for post-mortem dependability analysis. FIONA is simple to operate, and we expect it will facilitate the conduction of validation experiments by application developers and testers.

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This paper presents implementation and experiments of fault injection used to validate mechanisms of fault tolerance in communication protocols with temporal restrictions. It describes two approaches. The first implements fault injection through modifications in the application libraries, which ones support the target protocol. The second approach uses operating system resources. Also, the paper shows practical experiments using the fault injectors to validate a timeout mechanism of a communication protocol. The fault injectors are part of the INFIMO project, a toolkit to fault injection experimentation developed under Linux platform.