Common improvements regarding unified reporting of timeout errors
Common improvements regarding logging in util-blocking-class
Common improvements in util-classes
Solution2-callback specific improvements adding support callback-execute method + an alternate solution not using the execute method (i.e. use pure callback model)
Common improvements of error handling in util-classes
Solution2-callback specific improvement for eror handling
Common improvements of error handling in util-classes
Solution2-callback specific remove of user imports
Common  remove of user imports
Common routing slip - rx example
Common routing slip - callback example
Merged solution2-callback with routing-slip-rx-example
Common routing slip - rx  and blocking example added to solution2-callback
Common minor change to util-callback
callback specific improvement to bookLoanController
callback specific improvement to bookLoanController
Common changes enabling routing-slip examples of all three variants
solution2-callback specific
Common changes to blocking code
Common cleanup