Java says drawString while Clojure says drawstring. The compiler may be using introspection to find that method, and thus will not give you a compile-time message about the mismatch. I think you could avoid the introspection by using the "graphics" method argument instead of the "g2" variable, which isn't type hinted. Not finding .drawstring it will throw an exception. If AWT calls back on a thread other than your REPL thread then you might not notice the exception. Long story short, it can help to add try/catch. Then what to do in the catch? Log a message. println might or might not work, depending on the REPL and the threading. If println does not help then you can either open a file and write to it, or you might as well use a real logging library, e.g., clojure.tools.logging in conjunction with one of the Java libraries it deals with, such as Logback. Setting up logging in Java is tedious but very worth-while.
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