Major Description
To better fix/identify problems in multi-thread execution contexts, verify if write (additional) Unit Tests but with dedicated libraries (more specific than JUnit), like QuickCheck or one of others similar (for example see even ScalaCheck).
Note that usually many libraries for this require Java 8.
As repository use Polygene-sandbox (maybe in a feature branch), so it would be simpler to evolve/integrate/remove later in Polygene code base.
For more info, see related thread in our dev mailing list.