Exception in thread "Thread-4" java.net.SocketException: Broken pipe (Write failed)

Question

I am a Clojure noob and trying to learn the clj tool. I was following this https://betweentwoparens.com/start-a-clojurescript-app-from-scratch tutorial and at the command clj -A:dev got the following error:

Downloading: com/google/protobuf/protobuf-java/3.0.2/protobuf-java-3.0.2.jar from central
Downloading: com/google/code/findbugs/jsr305/3.0.2/jsr305-3.0.2.jar from central
Downloading: com/google/code/gson/gson/2.7/gson-2.7.jar from central
Exception in thread "Thread-4" java.net.SocketException: Broken pipe (Write failed)
    at java.base/java.net.SocketOutputStream.socketWrite0(Native Method)
    at java.base/java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:110)
    at java.base/java.net.SocketOutputStream.write(SocketOutputStream.java:150)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at clojure.lang.Reflector.invokeMatchingMethod(Reflector.java:167)
    at clojure.lang.Reflector.invokeInstanceMethod(Reflector.java:102)
    at cljs.repl.server$send_and_close.invokeStatic(server.clj:168)
    at cljs.repl.server$send_and_close.invoke(server.clj:144)
    at cljs.repl.browser$send_static.invokeStatic(browser.clj:205)
    at cljs.repl.browser$send_static.invoke(browser.clj:178)
    at cljs.repl.server$dispatch_request.invokeStatic(server.clj:191)
    at cljs.repl.server$dispatch_request.invoke(server.clj:182)
    at cljs.repl.server$handle_connection.invokeStatic(server.clj:199)
    at cljs.repl.server$handle_connection.invoke(server.clj:195)
    at cljs.repl.server$server_loop$fn__68.invoke(server.clj:209)
    at clojure.core$binding_conveyor_fn$fn__5754.invoke(core.clj:2030)
    at clojure.lang.AFn.run(AFn.java:22)
    at java.base/java.lang.Thread.run(Thread.java:834)

Why am I getting this error? My environment:

Ubuntu 18.04 in VirtualBox headless on Mac OSX Mojave.

[I] /home/user/tallex~> java -version
openjdk version "11.0.6" 2020-01-14 LTS
OpenJDK Runtime Environment Corretto-11.0.6.10.1 (build 11.0.6+10-LTS)
OpenJDK 64-Bit Server VM Corretto-11.0.6.10.1 (build 11.0.6+10-LTS, mixed mode)

I also tried this with:

[I] /home/sporty/software~> java -version
openjdk version "11.0.6" 2020-01-14
OpenJDK Runtime Environment (build 11.0.6+10-post-Ubuntu-1ubuntu118.04.1)
OpenJDK 64-Bit Server VM (build 11.0.6+10-post-Ubuntu-1ubuntu118.04.1, mixed mode, sharing)

The result is the same.

EDIT: This has to do with the CLJ not being able to open up a browser because I am running Ubuntu headless. So I added port forwarding to the host and it seems to bring up X windows browser.

Answer 1

This is because of running on headless virtual machine. When I added port forwarding to VirtualBox, it seemed to bring up the browser, but the REPL does not come up.

Comments

What page do you see in the browser?

---

In the browser, I do see the page that is shown on the Tutorial with the *Time Dive* in pink to red gradient.

---

I got the same issue with the very basic `clj -M -m cljs.main -r` on linux.

The official clojurescript quick start guide has the solution:
https://clojurescript.org/guides/quick-start

> If you are running Linux and the REPL does not start, try disabling browser auto-launch and opening http://localhost:9000 manually.

it means passing the `--repl-opts "{:launch-browser false}"` option in the command
[More about browser repl options](https://clojurescript.org/reference/repl-options#_browser_repl_options)

So in your case you should edit the `:dev` alias in `deps.edn` to look like:

(not tested)

```
:aliases
 {:dev {:main-opts ["-m"  "cljs.main"
                    "-ro" "{:static-dir [\".\",\"out\",\"resources\"], :launch-browser false}"
                    "-w"  "src"
                    "-c"  "tallex.time-dive"
                    "-r"]}}}
```