Revert "edit .project and change concurrency to mutability"

This reverts commit 6dab6e4b0e3593c569e7f6f1105564b33c1f8d8a.
Revert "add mutability module in pom"

This reverts commit 97437ac37374855082b1189aff3660bea361f9f2.
Revert "Revert "edit .project and change concurrency to mutability""

This reverts commit 8ed1735544a44099618326a346a4cf9161be7529.
in progress