pythonjavaelectronsubprocessenoent

Could Python Subprocess.Popen handle/ignore ENOENT error on Electron app launch and proceed ahead without fail as in command line

subprocess.open throws error spawn ./jre/bin/java ENOENT exception

import subprocess
subprocess.run([r"C:\Users\<user>\AppData\Local\Programs\<some_dir>\<some_tool>.exe", "--args", "--remote-debugging-port=9000"])

Also tried,

subprocess.Popen([r"C:\Users\<user>\AppData\Local\Programs\<some_dir>\<some_tool>.exe", "--args", "--remote-debugging-port=9000"])

Also tried shell=True param in Popen but didn't solve

Error after launching Electron app via subprocess

Manual launch of this app is not causing any issue.

  1. Not sure what is causing this issue - How can I fix the same?

  2. When i run this from command there is similar that appears in console output but no blocking dialog appears and application does not crash - Is there any way i can

replicate the NOT-crashing behavior from python as well.

Following is the command line output:

c:\Users\<user>\AppData\Local\Programs\<base_dir>>
18:56:05.542 > Start in production mode
18:56:05.585 > electron-log.transports.file: Can't write to c:\Users\<user>\AppData\Local\Programs\<base_dir>\resources\app.asar\logs\main.log Error: ENOTDIR, not a directory
    at createError (electron/js2c/asar_bundle.js:5:1382)
    at Object.e.mkdirSync (electron/js2c/asar_bundle.js:5:12161)
    at e (c:\Users\<user>\AppData\Local\Programs\<base_dir>\resources\app.asar\background.js:1:249748)
    at l.testFileWriting (c:\Users\<user>\AppData\Local\Programs\<base_dir>\resources\app.asar\background.js:1:249938)
    at l.createFile (c:\Users\<user>\AppData\Local\Programs\<base_dir>\resources\app.asar\background.js:1:249488)
    at l.provide (c:\Users\<user>\AppData\Local\Programs\<base_dir>\resources\app.asar\background.js:1:249315)
    at d (c:\Users\<user>\AppData\Local\Programs\<base_dir>\resources\app.asar\background.js:1:246666)
    at h (c:\Users\<user>\AppData\Local\Programs\<base_dir>\resources\app.asar\background.js:1:246165)
    at i (c:\Users\<user>\AppData\Local\Programs\<base_dir>\resources\app.asar\background.js:1:47829)
    at n (c:\Users\<user>\AppData\Local\Programs\<base_dir>\resources\app.asar\background.js:1:47621)
18:56:05.606 > Launching server at backend\<application>-backend-0.0.1-SNAPSHOT.jar at port 8885...
18:56:05.724 > Server PID: 69044
18:56:10.731 >
18:56:10.733 >   .   ____          _            __ _ _
18:56:10.737 >  /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
18:56:10.739 > ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
18:56:10.740 >  \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
18:56:10.741 >   '  |____| .__|_| |_|_| |_\__, | / / / /
18:56:10.742 >  =========|_|==============|___/=/_/_/_/
18:56:10.744 >  :: Spring Boot ::                (v2.5.4)
18:56:10.745 >
18:56:11.126 > 2021-12-10 18:56:11.119  INFO 69044 --- [           main] p.core.<application>BackendApplication  : Starting <application>BackendApplication using Java 11.0.13 on G1-6FWX7C3-L with PID 69044 (C:\Users\<user>\AppData\Local\Programs\<base_dir>\backend\<application>-backend-0.0.1-SNAPSHOT.jar started by <user> in c:\Users\<user>\AppData\Local\Programs\<base_dir>)
18:56:11.127 > 2021-12-10 18:56:11.126  INFO 69044 --- [           main] p.core.<application>BackendApplication  : No active profile set, falling back to default profiles: default
18:56:18.360 > 2021-12-10 18:56:18.359  INFO 69044 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8885 (http)
18:56:18.446 > 2021-12-10 18:56:18.444  INFO 69044 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
18:56:18.447 > 2021-12-10 18:56:18.445  INFO 69044 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.52]
18:56:18.889 > 2021-12-10 18:56:18.887  INFO 69044 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
18:56:18.891 > 2021-12-10 18:56:18.888  INFO 69044 --- [           main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 7499 ms
18:56:23.934 > 2021-12-10 18:56:23.933  INFO 69044 --- [           main] o.s.b.a.e.web.EndpointLinksResolver      : Exposing 14 endpoint(s) beneath base path '/rest/actuator'
18:56:24.174 > 2021-12-10 18:56:24.172  INFO 69044 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8885 (http) with context path ''
18:56:24.241 > 2021-12-10 18:56:24.241  INFO 69044 --- [           main] p.core.<application>BackendApplication  : Started <application>BackendApplication in 15.385 seconds (JVM running for 17.665)
18:56:24.644 > 2021-12-10 18:56:24.642  INFO 69044 --- [nio-8885-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring DispatcherServlet 'dispatcherServlet'
18:56:24.645 > 2021-12-10 18:56:24.643  INFO 69044 --- [nio-8885-exec-1] o.s.web.servlet.DispatcherServlet        : Initializing Servlet 'dispatcherServlet'
18:56:24.657 > 2021-12-10 18:56:24.647  INFO 69044 --- [nio-8885-exec-1] o.s.web.servlet.DispatcherServlet        : Completed initialization in 4 ms
Solution

  • Ok - so Electron Package was bundled with its own jre version which was causing the issue as invoking the exe was causing the JAVA dependencies to be looked up at system default jre path instead of the one bundled with the Electron application.

    Solution - switch to base directory of application and then launch it:

    import subprocess, os
from subprocess import *
os.chdir(r"C:\app_dir")
subprocess.Popen(['app.exe'])

    Hope this helps someone facing similar issue.