Preconditions

• Private GitLab project hosted @ https://gitlab.com

Steps

• Install Jenkins and Gitlab branch source plugin (versions mentioned in the environment field)
• Setup necessary credentials for GitLab integration (private token with API access && ssh creds.)
• Create a Multi branch pipeline
• Observe the logo/avatar displayed in the dashboard

Outcome

• The logo/avatar seem to be a randomly generated one
• The logs show that the attempt to fetch project's logo fails

  Feb 07, 2021 10:16:48 PM INFO io.jenkins.plugins.gitlabbranchsource.helpers.GitLabAvatarCache$FetchImage call
  
  Server returned HTTP response code: 401 for URL: https://gitlab.com/uploads/-/system/project/avatar/XXXXXXXX/IMG.png
  java.io.IOException: Server returned HTTP response code: 401 for URL: https://gitlab.com/uploads/-/system/project/avatar/XXXXXXXX/IMG.png
  	at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1924)
  	at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1520)
  	at java.base/sun.net.www.protocol.http.HttpURLConnection.getHeaderField(HttpURLConnection.java:3099)
  	at java.base/java.net.URLConnection.getContentType(URLConnection.java:519)
  	at java.base/sun.net.www.protocol.https.HttpsURLConnectionImpl.getContentType(HttpsURLConnectionImpl.java:402)
  	at io.jenkins.plugins.gitlabbranchsource.helpers.GitLabAvatarCache$FetchImage.call(GitLabAvatarCache.java:506)
  Caused: java.io.IOException: Server returned HTTP response code: 401 for URL: https://gitlab.com/uploads/-/system/project/avatar/XXXXXXXX/IMG.png
  	at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
  	at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
  	at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
  	at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:490)
  	at java.base/sun.net.www.protocol.http.HttpURLConnection$10.run(HttpURLConnection.java:1974)
  	at java.base/sun.net.www.protocol.http.HttpURLConnection$10.run(HttpURLConnection.java:1969)
  	at java.base/java.security.AccessController.doPrivileged(Native Method)
  	at java.base/sun.net.www.protocol.http.HttpURLConnection.getChainedException(HttpURLConnection.java:1968)
  	at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1536)
  	at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1520)
  	at java.base/sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:250)
  	at io.jenkins.plugins.gitlabbranchsource.helpers.GitLabAvatarCache$FetchImage.call(GitLabAvatarCache.java:513)
  	at io.jenkins.plugins.gitlabbranchsource.helpers.GitLabAvatarCache$FetchImage.call(GitLabAvatarCache.java:490)
  	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
  	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
  	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
  	at java.base/java.lang.Thread.run(Thread.java:834)
  

Notes

• The project builds normally otherwise and build status is correctly pushed to GitLab
• Trying the failing URL (from logs) in the browser actually provides the project logo/avatar