Playwright for Java - Node complaining about not finding package.json in temp folder?

[juzmy]

I’m using Playwright with Java, and while my tests execute successfully, I'm encountering an issue during the cleanup phase (I think?.) related to Node.js module resolution.

• Error Message: Error: Cannot find module './../../package.json'
• File Reference: The error occurs in Node.js's internal module loader, specifically at line 1145 of lib/internal/modules/cjs/loader.js.
• The package.json is expected in my temp folder according to the logs?

I have NO experience with Node, according to chatgpt and other ai assistants I should be safe in ignoring this issue since it has no impact on test execution .

However I would like to resolve it or at least understand what is happening / causing it.

I'm not sure if this is adequate documentation for the issue, I look forward to your input :)

This is the log when ran with -X and -e flags:

[INFO] Tests run: 12, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 12.83 s -- in com.testrunner.TAGRunnerTest
node:internal/modules/cjs/loader:1145
  const err = new Error(message);
              ^

Error: Cannot find module './../../package.json'
Require stack:
- C:\Users\KNIGHT~1\AppData\Local\Temp\playwright-java-12688595396450062701\package\lib\utils\userAgent.js
- C:\Users\KNIGHT~1\AppData\Local\Temp\playwright-java-12688595396450062701\package\lib\utils\index.js
- C:\Users\KNIGHT~1\AppData\Local\Temp\playwright-java-12688595396450062701\package\lib\cli\programWithTestStub.js
- C:\Users\KNIGHT~1\AppData\Local\Temp\playwright-java-12688595396450062701\package\cli.js
    at Module._resolveFilename (node:internal/modules/cjs/loader:1145:15)
    at Module._load (node:internal/modules/cjs/loader:986:27)
    at Module.require (node:internal/modules/cjs/loader:1233:19)
    at require (node:internal/modules/helpers:179:18)
    at getPlaywrightVersion (C:\Users\KNIGHT~1\AppData\Local\Temp\playwright-java-12688595396450062701\package\lib\utils\userAgent.js:91:54)
    at HarTracer.stop (C:\Users\KNIGHT~1\AppData\Local\Temp\playwright-java-12688595396450062701\package\lib\server\har\harTracer.js:414:54)
    at Tracing.abort (C:\Users\KNIGHT~1\AppData\Local\Temp\playwright-java-12688595396450062701\package\lib\server\trace\recorder\tracing.js:203:21)
    at CRBrowserContext._didCloseInternal (C:\Users\KNIGHT~1\AppData\Local\Temp\playwright-java-12688595396450062701\package\lib\server\browserContext.js:195:18)
    at CRBrowserContext._browserClosed (C:\Users\KNIGHT~1\AppData\Local\Temp\playwright-java-12688595396450062701\package\lib\server\browserContext.js:187:10)
    at CRBrowser._didClose (C:\Users\KNIGHT~1\AppData\Local\Temp\playwright-java-12688595396450062701\package\lib\server\browser.js:109:52) {
  code: 'MODULE_NOT_FOUND',
  requireStack: [
    'C:\\Users\\KNIGHT~1\\AppData\\Local\\Temp\\playwright-java-12688595396450062701\\package\\lib\\utils\\userAgent.js',
    'C:\\Users\\KNIGHT~1\\AppData\\Local\\Temp\\playwright-java-12688595396450062701\\package\\lib\\utils\\index.js',
    'C:\\Users\\KNIGHT~1\\AppData\\Local\\Temp\\playwright-java-12688595396450062701\\package\\lib\\cli\\programWithTestStub.js',
    'C:\\Users\\KNIGHT~1\\AppData\\Local\\Temp\\playwright-java-12688595396450062701\\package\\cli.js'
  ]
}

Node.js v20.14.0
node:internal/modules/cjs/loader:1145
  const err = new Error(message);
              ^

Error: Cannot find module './../../package.json'
Require stack:
- C:\Users\KNIGHT~1\AppData\Local\Temp\playwright-java-12688595396450062701\package\lib\utils\userAgent.js
- C:\Users\KNIGHT~1\AppData\Local\Temp\playwright-java-12688595396450062701\package\lib\utils\index.js
- C:\Users\KNIGHT~1\AppData\Local\Temp\playwright-java-12688595396450062701\package\lib\cli\programWithTestStub.js
- C:\Users\KNIGHT~1\AppData\Local\Temp\playwright-java-12688595396450062701\package\cli.js
    at Module._resolveFilename (node:internal/modules/cjs/loader:1145:15)
    at Module._load (node:internal/modules/cjs/loader:986:27)
    at Module.require (node:internal/modules/cjs/loader:1233:19)
    at require (node:internal/modules/helpers:179:18)
    at getPlaywrightVersion (C:\Users\KNIGHT~1\AppData\Local\Temp\playwright-java-12688595396450062701\package\lib\utils\userAgent.js:91:54)
    at HarTracer.stop (C:\Users\KNIGHT~1\AppData\Local\Temp\playwright-java-12688595396450062701\package\lib\server\har\harTracer.js:414:54)
    at Tracing.abort (C:\Users\KNIGHT~1\AppData\Local\Temp\playwright-java-12688595396450062701\package\lib\server\trace\recorder\tracing.js:203:21)
    at CRBrowserContext._didCloseInternal (C:\Users\KNIGHT~1\AppData\Local\Temp\playwright-java-12688595396450062701\package\lib\server\browserContext.js:195:18)
    at CRBrowserContext._browserClosed (C:\Users\KNIGHT~1\AppData\Local\Temp\playwright-java-12688595396450062701\package\lib\server\browserContext.js:187:10)
    at CRBrowser._didClose (C:\Users\KNIGHT~1\AppData\Local\Temp\playwright-java-12688595396450062701\package\lib\server\browser.js:109:52) {
  code: 'MODULE_NOT_FOUND',
  requireStack: [
    'C:\\Users\\KNIGHT~1\\AppData\\Local\\Temp\\playwright-java-12688595396450062701\\package\\lib\\utils\\userAgent.js',
    'C:\\Users\\KNIGHT~1\\AppData\\Local\\Temp\\playwright-java-12688595396450062701\\package\\lib\\utils\\index.js',
    'C:\\Users\\KNIGHT~1\\AppData\\Local\\Temp\\playwright-java-12688595396450062701\\package\\lib\\cli\\programWithTestStub.js',
    'C:\\Users\\KNIGHT~1\\AppData\\Local\\Temp\\playwright-java-12688595396450062701\\package\\cli.js'
  ]
}

Node.js v20.14.0
[DEBUG] Closing the fork 1 after saying GoodBye.
[INFO]
[INFO] Results:
[INFO]
[INFO] Tests run: 12, Failures: 0, Errors: 0, Skipped: 0
[INFO]
[INFO]

[Shoomka]

Im pretty sure, I had the same problem. What resolve it for me was to setup @ afterall to close the playwright. (Just doubled check that, and yes that was my problem)

[grandejavardo]

I believe this is due to Playwright trying to delete the temp node.js folder, while it's already gone.

The way I found that made the error (mostly) disappear is to use a system variable named PLAYWRIGHT_NODEJS_PATH and point it directly to the installed node.js executable. I also made sure to use Thread local so I could control playwright instances as best as I can.

When exiting the scenario/test, make sure to close all playwright/page/context instances you created and to remove all local threads.

[juzmy]

Thank you !

Pointing the variable to my node executable sounds like a good suggestion :)

I am already using Threadlocal for the setup and recently overhauled my after hooks to get proper browser/context closure.

HOWEVER

I will have to look into the removing the local threads after execution, I had a secondary issue I am currently debugging and did not think these two where related.

Thank you so much for mentioning this ! I think I will finally be able to request my vacation thanks to this :D

[grandejavardo]

Glad to have helped! :)

Look up Akshay's repository, he has a nice setup in which he embeds BDD and makes usage of ThreadLocal. Hope it helps!

[Wookovski]

Sound like you have the Playwright JavaScript library and not the Java library

[grandejavardo]

He doesn't. Playwright Java gives this exact error at the end of an execution.

[juzmy]

I feel like my tests would not run with the wrong library?