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Editorial Team
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Asked: 2026-06-16T11:27:03+00:00

I have been unable to get nREPL to work with SWT on Mac OS

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I have been unable to get nREPL to work with SWT on Mac OS X.

To reproduce the problem, create a new SWT project with the following project.clj file:

(defproject swttest "0.1.0"
  :description "Foo"
  :dependencies [[org.clojure/clojure "1.4.0"]
                 [org.eclipse.swt/org.eclipse.swt.cocoa.macosx.x86_64 "3.8"]]
  :jvm-opts ["-XstartOnFirstThread"]
  :repositories [["swt-repo" "https://swt-repo.googlecode.com/svn/repo/"]])

Then launch the REPL using “lein repl”. Finally, run the following command:

user> (org.eclipse.swt.widgets.Display.)

The following error occurs:

SWTException Invalid thread access  org.eclipse.swt.SWT.error (:-1)

How can I get this to work?

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1 Answer

  1. Editorial Team

    Found the solution. Instead of using nREPL, run it in a “dumb” REPL, by modifying the project.clj file to include a “dumbrepl” alias, like so:

    (defproject swttest "0.1.0"
  :description "Foo"
  :dependencies [[org.clojure/clojure "1.4.0"]
                 [org.eclipse.swt/org.eclipse.swt.cocoa.macosx.x86_64 "3.8"]]
  :jvm-opts ["-XstartOnFirstThread"]
  :aliases {"dumbrepl" ["trampoline" "run" "-m" "clojure.main/main"]}
  :repositories [["swt-repo" "https://swt-repo.googlecode.com/svn/repo/"]])

    Then run:

    > lein dumbrepl
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