Jassda(Java with assertions Debugger
Architecture) is a tool for checking trace- and time-assertions
of Java applications.
Todays software systems become more and more complex. But
the complexity is not the only problem to handle. Software
also gets more distributed, e.g. as consequence of the growing
number of web-based software systems. This results in a special
interest in tracking the correctness of these software systems,
but formal specification techniques and especially static
checking of programs against those specification are the topic
of current research, and currently is often not applicable
for large software systems.
The trace assertions approach extends the traditional Design
by Contract concept by dealing with the dynamic order of such
component uses: which component may use which other component
and what third component has possibly to be used before. So
we are interested in when the use of a component begins and
when it ends. For this reason the entry and exit points become
events that we want to observe, and therefore a program run
emits a sequence, i.e. a trace, of those events.
To describe the desired behaviour of a program we define
CSP-like parallel processes that specify all those traces
that we want to allow. In some cases certain events may not
matter for the correct execution of a program, so the events
of interest are restricted to the set of events mentioned
in the specifying process, called the alphabet of the process.
This alphabet helps to reduce the amount of events to be emitted
by the program, since this might be an important performance
aspect as shows. Jassda does not precompile Java source code
to emit and check events but uses the Java Debug Interface
(JDI) to do this. Therefore Jassda does not have to modify
the source code of the observed Java program.
Jassda was developed by Dipl.-Inform. Mark
Brörkens at his mastersthesis. The work was supported
by the Correct System Design
Group. The group also continues the work on Jassda in the context of the
It is an opensource-project