[SOLVED] Why CIDER auto closed after I closed seesaw window?

[stardiviner]

Bellowing is the steps to reproduce the problem:

1. generate seesaw project template

   lein new hello-seesaw
   

   <data/code/hello-seesaw/project.clj>

2. Add seesaw to Leiningen project.clj

   (defproject hello-seesaw "0.1.0-SNAPSHOT"
     :description "FIXME: write description"
     :url "http://example.com/FIXME"
     :license {:name "EPL-2.0 OR GPL-2.0-or-later WITH Classpath-exception-2.0"
               :url  "https://www.eclipse.org/legal/epl-2.0/"}
     :dependencies [[org.clojure/clojure "1.10.1"]
                    [seesaw "1.5.0"]]
     :repl-options {:init-ns hello-seesaw.core})
   

3. Now load project source files with CIDER and evaluate the -main function in src/hello_seesaw/core.clj file:

   (ns hello-seesaw.core
     (:use seesaw.core))
   
   (defn -main [& args]
     (invoke-later
      (-> (frame :title "Hello",
                 :content "Hello, Seesaw",
                 :on-close :exit)
          pack!
          show!)))
   

4. It displays seesaw window, I closed it. Then CIDER REPL buffer displays red message reports that CIDER is closed.

---

CIDER version: 0.26.1
Emacs version: 28.0.50

[joinr]

You set the :frame to :on-close-exit, which means that (System/exit 0) will be invoked when the window closes. This is a typical setup if you have a pure gui app where closing the window means exiting the program. You don’t want this during repl development, so use a different option, :hide, :dispose, :nothing. You probably want :dispose

[stardiviner]

I see, thanks very much! @joinr