Problem with the uberjar after upgrading from 3.7.0 to 4.0.0 about langohr

[michaelklishin]

Please use mailing list for questions in the future.

Your problem is that you open a connection in top level namespace code. Any potentially blocking operation will block the compiler.

You want to use Component or a similar library that makes it easier to initialise dependencies and store them in application-wide state without using top level namespace code.

[michaelklishin]

Also Component will make it easy to reset system state, e.g. between tests, while with connections stored in vars all your options (alter-var-root and such) are hacky and introduce mutable shared state.