I´ve created a fresh composer project (named TestProject) and added two jardef artifcats containing jar´s with implementation and interface classes. I can install this project into a docbase and /System/Applications/TestProject was created with some jar files.
If i now add a new module artifact using the two jardefs artifacts a subsequent installation of the project into the docbase fails.
I´ve attached the logfile (tracing enabled). I can´t see why installation fails.