Problem: When I connect to a socket server and create a thread, exceptions
in the thread are printed in the server's process, not the client's. I'd
like them to appear in the client's process, where the thread was created.
(I'm using the term "process" very generally here, because I don't
understand what is going on.)
>From searching, I understand that there are some other things at play, like
System/err, but I don't understand what is happening or how I can work
around it. Why does an exception thrown in the client process show in the
client process, but an exception thrown in a thread created by the client
process shows in the server process? Why doesn't binding *err* in a thread
seem to have any effect? Any suggestions or workarounds?
I'm not using futures, because this is a long-running process that never
returns a value.
Example transcript:
# Socker server
(The only command entered is the first one, which begins with clj.
Everything after "user=>" is due to the client below.)
$ clj -J-Dclojure.server.myrepl='{:port
5555,:accept,clojure.core.server/repl}'
Clojure 1.10.1
user=> My second message.
Exception in thread "Thread-0" clojure.lang.ExceptionInfo: My second
exception {}
at user$eval5$fn__141.invoke(NO_SOURCE_FILE:7)
at clojure.lang.AFn.run(AFn.java:22)
at java.lang.Thread.run(Thread.java:745)
Exception in thread "Thread-1" clojure.lang.ExceptionInfo: My third
exception {}
at user$eval144$fn__145.invoke(NO_SOURCE_FILE:16)
at clojure.lang.AFn.run(AFn.java:22)
at java.lang.Thread.run(Thread.java:745)
# Client
$ nc localhost 5555
user=> (println "My first message.")
My first message.
nil
user=> (throw (ex-info "My first exception." {}))
Execution error (ExceptionInfo) at user/eval3 (REPL:2).
My first exception.
user=> (.start
(Thread.
(fn []
(println "My second message.")
(throw (ex-info "My second exception" {})))))
nil
user=> (.start
(Thread.
(let [out *out*
err *err*]
(fn []
(binding [*out* out
*err* err]
(println "My third message.")
(throw (ex-info "My third exception" {})))))))
nil
My third message.
Any clues would be appreciated. Thanks!
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