[JENKINS-30997] Gerrit trigger is not able to connect with gerrit server in jenkins version 1.633

I have install gerrit (version 2.11) server. and jenkins (version 1.633)

I have followed the gerrit access right as mention in this link https://wiki.jenkins-ci.org/display/JENKINS/Gerrit+Trigger

i have secified my gerrit server setting in gerrit trigger.

but when i tried to test connection than it's showing error as below:

Connection error : com.jcraft.jsch.JSchException: java.lang.RuntimeException: java.lang.ClassNotFoundException: com.jcraft.jsch.Buffer

But with jenkins version 1.625.1 it's working fine

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Originally reported by neeraj_kumawat, imported from: Gerrit trigger is not able to connect with gerrit server in jenkins version 1.633

• status: Open
  
• priority: Major
  
• component(s): gerrit-trigger-plugin
  
• resolution: Unresolved
  
• votes: 1
  
• watchers: 2
  
• imported: 2025-12-06
  

Raw content of original issue

I have install gerrit (version 2.11) server. and jenkins (version 1.633)

I have followed the gerrit access right as mention in this link https://wiki.jenkins-ci.org/display/JENKINS/Gerrit+Trigger

i have secified my gerrit server setting in gerrit trigger.

but when i tried to test connection than it's showing error as below:

Connection error : com.jcraft.jsch.JSchException: java.lang.RuntimeException: java.lang.ClassNotFoundException: com.jcraft.jsch.Buffer


But with jenkins version 1.625.1 it's working fine

Start by reproducing the Gerrit trigger connection test with Gerrit 2.11 and Jenkins 1.633, comparing it with the working Jenkins 1.625.1 setup. Investigate the reported JSch ClassNotFoundException for com.jcraft.jsch.Buffer; done means the connection test succeeds on the affected version without regressing the older working setup.

Written by the indexing model from the issue text.