Hi Team,

We are facing issue with Azure Devops Service Hook Trigger Git Build when we are pushing the changes the Jenkins build is not starting, we are getting HTTP 500 server error.

Please find the below response & request for the same.

Request:

Method: GET
URI: https://<Jenkins URL>/git/notifyCommit?url=https:%2F%2Ffabrikam-fiber-inc.visualstudio.com%2FDefaultCollection%2F_git%2FFabrikam-Fiber-Git&sha1=fnrfnifniedidbedediqeodxjqosjiew&branches=master
HTTP Version: 1.1
Headers:
{
  X-VSS-ActivityId: fienfifiwnind-fnrdivcuibuiescv-cujhsbc
  X-VSS-SubscriptionId: recdcic-fnreci-veicikdnci
  User-Agent: VSServices/16.205.33618.1
  User-Agent: (w3wp.exe)
  Authorization: Basic ********
}

Response:

Status Code: 500
Reason Phrase: Server Error
HTTP Version: 1.1
Headers:
{
  X-Jenkins-Session: 5ec30227
  X-Instance-Identity: 
  Cross-Origin-Opener-Policy: same-origin
  X-Hudson-Theme: default
  X-Content-Type-Options: nosniff
  Connection: close
  X-Hudson: 1.395
  X-Frame-Options: sameorigin
  Referrer-Policy: same-origin
  X-Jenkins: 2.426.2
  Cache-Control: no-store, must-revalidate, no-cache
  Date: Tue, 02 Jan 2024 05:49:18 GMT
  Set-Cookie:
  Server: Jetty(10.0.18)
  Content-Length: 9869
  Content-Type: text/html; charset=utf-8
  Expires: Thu, 01 Jan 1970 00:00:00 GMT
}

We have also checked the Jenkins Master logs and we see below error in the logs.

2024-01-04 07:28:42.536+0000 [id=288646465]  WARNING h.i.i.InstallUncaughtExceptionHandler#handleException: Caught unhandled exception with ID firnfirn-c4jrnb1-4vrve11-avesef352-13vr445893b10bc
java.lang.NullPointerException: Cannot invoke "hudson.scm.SCM.getKey()" because "scm" is null

Can someone please help us to resolve this issue.