If there is an error in the binding expressions built with the high-level bindings API, in most cases there's a silent failure, and no means of easily detecting problems. Furthermore, when using the Bindings.when(...) expression, it would be helpful to be able to log the evaluation steps to debug the expressions.

See this posting for an example (Using Bindings.select(...)): http://stackoverflow.com/questions/9828489/how-to-use-javafx-beans-binding-bindings-select-for-concise-value-binding