There’s lots of different things that can cause this error. The one that I was hitting was rather unintuitive.
This one took me a while to figure out.
Whenever I was using Microsoft PowerPoint or Word, when I tried to drop down the font menu, I would get the “Busy” spinning beach ball for about five seconds, then the menu would open.
It took me a bit to figure out how to use the REPL inside Cursive with a Luminus project.
The key difference is you have to add a Leiningen Run Configuration, instead of the usual Clojure Repl Configuration, with how you’d normally run it on the command line.
After that, create a Clojure REPL Configuration that connects to the port that is opened by the run configuration.
Example: If you normally do this:
lein repl :connect 7000
Then the Leiningen Run Configuration is the first command, and the Clojure REPL Configuration is the second one.
Picture, 1000 words, etc.
Some notes I’ve taken on my journey to really understand Clojure macros. Today I basically walked through the cond-> macro in clojure.core, and these are my notes as I figured out how it works.
Just some notes to myself… If you find it helpful, great! If you find it confusing, my apologies.
Ring is the lowest level integration point between a Clojure application and a web server; it’s at about the same level as Ruby’s Rack, or Python’s WSGI, or Tomcat’s AJP. However, unlike in those other languages, most Clojure web applications and frameworks don’t sit much higher than Ring, so it’s pretty important to understand how Ring works.