Support adding -Djdk.attach.allowAttachSelf to jack-in params

Add `cider-enable-nrepl-jvmti-agent` customizable to control this behaviour.

cider.el

@@ -173,7 +173,6 @@ then concatenated into the \"-M[your-aliases]:cider/nrepl\" form."
   :safe #'stringp
   :package-version '(cider . "1.1"))
 
-
 (defcustom cider-clojure-cli-global-aliases
   nil
   "Global aliases to include when jacking in with the clojure CLI.
@@ -186,7 +185,6 @@ then concatenated into the \"-M[your-aliases]:cider/nrepl\" form."
   :safe #'stringp
   :package-version '(cider . "1.14"))
 
-
 (defcustom cider-shadow-cljs-command
   "npx shadow-cljs"
   "The command used to execute shadow-cljs.
@@ -376,6 +374,14 @@ The repl dependendcies are most likely to be nREPL middlewares."
   :safe #'booleanp
   :version '(cider . "0.11.0"))
 
+(defcustom cider-enable-nrepl-jvmti-agent nil
+  "When t, add `-Djdk.attach.allowAttachSelf' to the command line arguments.
+This allows nREPL JVMTI agent to be loaded.  It is needed for evaluation
+interruption to properly work on Java 21 and above."
+  :type 'boolean
+  :safe #'booleanp
+  :version '(cider . "1.15.0"))
+
 (defcustom cider-offer-to-open-cljs-app-in-browser t
   "When nil, do not offer to open ClojureScript apps in a browser on connect."
   :type 'boolean
@@ -536,7 +542,7 @@ Throws an error if PROJECT-TYPE is unknown."
   "List of dependencies where elements are lists of artifact name and version.")
 (put 'cider-jack-in-dependencies 'risky-local-variable t)
 
-(defcustom cider-injected-nrepl-version "1.1.2"
+(defcustom cider-injected-nrepl-version "1.2.0-beta2"
   "The version of nREPL injected on jack-in.
 We inject the newest known version of nREPL just in case
 your version of Boot or Leiningen is bundling an older one."
@@ -762,6 +768,9 @@ group:artifact:version notation and MIDDLEWARES are
 prepared as arguments to Clojurephant's ClojureNRepl task."
   (concat global-opts
           (unless (seq-empty-p global-opts) " ")
+          (if cider-enable-nrepl-jvmti-agent
+              (shell-quote-argument "-Pjdk.attach.allowAttachSelf"))
+          (when cider-enable-nrepl-jvmti-agent " ")
           (cider--gradle-jack-in-property (append (cider--jack-in-required-dependencies) dependencies))
           " "
           params
@@ -813,7 +822,9 @@ removed, LEIN-PLUGINS, LEIN-MIDDLEWARES and finally PARAMS."
                       (seq-map (lambda (middleware)
                                  (concat "update-in :middleware conj "
                                          middleware))
-                               lein-middlewares))
+                               lein-middlewares)
+                      (when cider-enable-nrepl-jvmti-agent
+                        `(,(concat "update-in :jvm-opts conj " (shell-quote-argument "-Djdk.attach.allowAttachSelf")))))
               " -- ")
    " -- "
    (if (not cider-enrich-classpath)
@@ -903,9 +914,10 @@ your aliases contain any mains, the cider/nrepl one will be the one used."
          (deps (format "{:deps {%s} :aliases {:cider/nrepl {:main-opts [%s]}}}"
                        (string-join all-deps " ") main-opts))
          (deps-quoted (cider--shell-quote-argument deps command)))
-    (format "%s-Sdeps %s -M%s:cider/nrepl%s"
+    (format "%s%s-Sdeps %s -M%s:cider/nrepl%s"
             ;; TODO: global-options are deprecated and should be removed in CIDER 2.0
             (if global-options (format "%s " global-options) "")
+            (if cider-enable-nrepl-jvmti-agent "-J-Djdk.attach.allowAttachSelf " "")
             deps-quoted
             (cider--combined-aliases)
             (if params (format " %s" params) ""))))

doc/modules/ROOT/pages/basics/up_and_running.adoc

@@ -204,6 +204,14 @@ You can further customize the command line CIDER uses for `cider-jack-in` by
 modifying the some options. Those differ a bit between the various tools,
 so we'll examine them tool by tool.
 
+==== Enabling nREPL JVMTI agent
+
+Since version 1.2.0, nREPL ships together with a native JVMTI agent, so that the
+eval interrupts properly work on Java 20 and later. To enable the agent, the
+Java process should be launched with `-Djdk.attach.allowAttachSelf`. CIDER will
+do it automatically during jack-in if you change
+`cider-enable-nrepl-jvmti-agent` customizable to `t`.
+
 ==== Leiningen Options
 
 * `cider-lein-command` - the name of the Leiningen executable (`lein` by default)

doc/modules/ROOT/pages/usage/code_evaluation.adoc

@@ -161,6 +161,12 @@ NOTE: CIDER internally increases the timeout to 30 seconds for the first sync ev
 
 == Configuration
 
+=== Enable evaluation interrupts on Java 21 and newer
+
+Special variable `cider-enable-nrepl-jvmti-agent` has to be enabled for
+interrupts to work properly on Java 21+. See
+xref:basics/up_and_running.adoc#enabling-nrepl-jvmti-agent[JVMTI agent] section.
+
 === Display Spinner During Evaluation
 
 Some evaluation operations take a while to complete, so CIDER will display a

test/cider-tests.el

@@ -147,7 +147,8 @@
       (setq-local cider-injected-middleware-version "0.49.0")
       (setq-local cider-jack-in-nrepl-middlewares '("cider.nrepl/cider-middleware"))
       (setq-local cider-jack-in-dependencies-exclusions '())
-      (setq-local cider-enrich-classpath t))
+      (setq-local cider-enrich-classpath t)
+      (setq-local cider-enable-nrepl-jvmti-agent t))
 
     (it "can inject dependencies in a lein project"
       (expect (cider-inject-jack-in-dependencies "" "repl :headless" 'lein)
@@ -157,6 +158,7 @@
                                 (shell-quote-argument "[cider/cider-nrepl \"0.49.0\"]")
                                 " -- update-in :plugins conj "
                                 (shell-quote-argument "[mx.cider/lein-enrich-classpath \"1.19.3\"]")
+                                " -- update-in :jvm-opts conj -Djdk.attach.allowAttachSelf"
                                 " -- update-in :middleware conj cider.enrich-classpath.plugin-v2/middleware"
                                 " -- repl :headless")))
 
@@ -170,6 +172,7 @@
                          (shell-quote-argument "[cider/cider-nrepl \"0.49.0\"]")
                          " -- update-in :plugins conj "
                          (shell-quote-argument "[mx.cider/lein-enrich-classpath \"1.19.3\"]")
+                         " -- update-in :jvm-opts conj -Djdk.attach.allowAttachSelf"
                          " -- update-in :middleware conj cider.enrich-classpath.plugin-v2/middleware"
                          " -- repl :headless")))
 
@@ -182,6 +185,7 @@
                                 (shell-quote-argument "[cider/cider-nrepl \"0.49.0\"]")
                                 " -- update-in :plugins conj "
                                 (shell-quote-argument "[mx.cider/lein-enrich-classpath \"1.19.3\"]")
+                                " -- update-in :jvm-opts conj -Djdk.attach.allowAttachSelf"
                                 " -- update-in :middleware conj cider.enrich-classpath.plugin-v2/middleware"
                                 " -- repl :headless")))
 
@@ -201,6 +205,7 @@
     (it "can inject dependencies in a gradle project"
       (expect (cider-inject-jack-in-dependencies "--no-daemon" ":clojureRepl" 'gradle)
               :to-equal (concat "--no-daemon "
+                                "-Pjdk.attach.allowAttachSelf "
                                 (shell-quote-argument "-Pdev.clojurephant.jack-in.nrepl=nrepl:nrepl:0.9.0,cider:cider-nrepl:0.49.0")
                                 " :clojureRepl "
                                 (shell-quote-argument "--middleware=cider.nrepl/cider-middleware")))))
@@ -221,6 +226,7 @@
                                 (shell-quote-argument "[cider/cider-nrepl \"0.49.0\"]")
                                 " -- update-in :plugins conj "
                                 (shell-quote-argument "[mx.cider/lein-enrich-classpath \"1.19.3\"]")
+                                " -- update-in :jvm-opts conj -Djdk.attach.allowAttachSelf"
                                 " -- update-in :middleware conj cider.enrich-classpath.plugin-v2/middleware"
                                 " -- repl :headless")))
 
@@ -256,6 +262,7 @@
                                 (shell-quote-argument "[cider/cider-nrepl \"0.49.0\"]")
                                 " -- update-in :plugins conj "
                                 (shell-quote-argument "[mx.cider/lein-enrich-classpath \"1.19.3\"]")
+                                " -- update-in :jvm-opts conj -Djdk.attach.allowAttachSelf"
                                 " -- update-in :middleware conj cider.enrich-classpath.plugin-v2/middleware"
                                 " -- repl :headless")))
     (it "can concat in a boot project"
@@ -272,6 +279,7 @@
     (it "can concat in a gradle project"
       (expect (cider-inject-jack-in-dependencies "--no-daemon" ":clojureRepl" 'gradle)
               :to-equal (concat "--no-daemon "
+                                "-Pjdk.attach.allowAttachSelf "
                                 (shell-quote-argument "-Pdev.clojurephant.jack-in.nrepl=nrepl:nrepl:0.9.0,cider:cider-nrepl:0.49.0")
                                 " :clojureRepl "
                                 (shell-quote-argument "--middleware=cider.nrepl/cider-middleware")))))
@@ -337,6 +345,7 @@
                                 (shell-quote-argument "[cider/cider-nrepl \"0.49.0\"]")
                                 " -- update-in :plugins conj "
                                 (shell-quote-argument "[mx.cider/lein-enrich-classpath \"1.19.3\"]")
+                                " -- update-in :jvm-opts conj -Djdk.attach.allowAttachSelf"
                                 " -- update-in :middleware conj cider.enrich-classpath.plugin-v2/middleware"
                                 " -- repl :headless"))))
 
@@ -454,6 +463,7 @@
         (setq-local cider-clojure-cli-command "clojure")
         (setq-local cider-inject-dependencies-at-jack-in t)
         (setq-local cider-clojure-cli-aliases nil)
+        (setq-local cider-enable-nrepl-jvmti-agent t)
         (spy-on 'cider-project-type :and-return-value 'clojure-cli)
         (spy-on 'cider-jack-in-resolve-command :and-return-value "clojure")
         (expect (plist-get (cider--update-jack-in-cmd nil) :jack-in-cmd)
@@ -469,6 +479,7 @@
         (setq-local cider-allow-jack-in-without-project t)
         (setq-local cider-clojure-cli-command "clojure")
         (setq-local cider-inject-dependencies-at-jack-in t)
+        (setq-local cider-enable-nrepl-jvmti-agent t)
         (spy-on 'cider-project-type :and-return-value 'clojure-cli)
         (spy-on 'cider-jack-in-resolve-command :and-return-value "clojure")
         (expect (plist-get (cider--update-jack-in-cmd nil) :jack-in-cmd)
@@ -534,6 +545,7 @@
         (setq-local cider-clojure-cli-command "clojure")
         (setq-local cider-inject-dependencies-at-jack-in t)
         (setq-local cider-clojure-cli-aliases nil)
+        (setq-local cider-enable-nrepl-jvmti-agent t)
         (spy-on 'cider-project-type :and-return-value 'clojure-cli)
         (spy-on 'cider-jack-in-resolve-command :and-return-value "clojure")
         (expect (plist-get (cider--update-jack-in-cmd nil) :jack-in-cmd)