how do you set -Djdk.attach.allowAttachSelf enabled so that I can interrupt a cider repl in emacs

Tue, 02 Sep 2025 15:56:27 +0000

In a long running process I want to interrupt the repl.
if you set deps.edn with the following:

:aliases {:dev {:jvm-opts ["-Djdk.attach.allowAttachSelf enabled"
                            "-XX:+PreserveFramePointer"
                            "-XX:+UnlockDiagnosticVMOptions"
                            "-XX:+DebugNonSafepoints"]}}

and then in init.el:

(setq cider-clojure-cli-global-options "-Adev")

you can avoid the following error:

ERROR: Cannot stop thread on JDK21+ without -Djdk.attach.allowAttachSelf 
enabled, see https://nrepl.org/nrepl/installation.html#jvmti.

but the java process still continues

Clojure Q&A - Recent questions tagged jdk21

how do you set -Djdk.attach.allowAttachSelf enabled so that I can interrupt a cider repl in emacs