Gerrit trigger in Jenkins not starting builds

[Gaurav Negi]

Dear Gerrit experts,

    I am using Gerrit 2.10 integrated with Jenkins via "Gerrit Trigger" of Jenkins.

1. In Jenkins Created a Gerrit server and I can see it has started and green. 

2. Problem is when I am pushing a new commit to Gerrit, Jenkins is triggering the new build.

Even though the build job is based on "Gerrit Event"

It was working with older instance of Gerrit. I created a new instance of Gerrit, it stopped working. 

Any input will be highly appreciated.

On Jenkins, I am seeing this error. 

   Mar 4, 2016 5:03:20 PM com.sonymobile.tools.gerrit.gerritevents.GerritConnection connect

SEVERE: IOException: 

com.sonymobile.tools.gerrit.gerritevents.ssh.SshException: com.jcraft.jsch.JSchException: java.net.ConnectException: Connection refused

at com.sonymobile.tools.gerrit.gerritevents.ssh.SshConnectionImpl.connect(SshConnectionImpl.java:181)

at com.sonymobile.tools.gerrit.gerritevents.ssh.SshConnectionFactory.getConnection(SshConnectionFactory.java:98)

at com.sonymobile.tools.gerrit.gerritevents.GerritConnection.connect(GerritConnection.java:380)

at com.sonymobile.tools.gerrit.gerritevents.GerritConnection.run(GerritConnection.java:306)

Caused by: com.jcraft.jsch.JSchException: java.net.ConnectException: Connection refused

at com.jcraft.jsch.Util.createSocket(Util.java:344)

at com.jcraft.jsch.Session.connect(Session.java:215)

at com.jcraft.jsch.Session.connect(Session.java:183)

at com.sonymobile.tools.gerrit.gerritevents.ssh.SshConnectionImpl.connect(SshConnectionImpl.java:177)

... 3 more

When I am trying to retrigger older jenkins builds. Getting this message.

A problem occurred while processing the request. Please check our bug tracker to see if a similar problem has already been reported. If it is already reported, please vote and put a comment on it to let us gauge the impact of the problem. If you think this is a new issue, please file a new issue. When you file an issue, make sure to add the entire stack trace, along with the version of Jenkins and relevant plugins. The users list might be also useful in understanding what has happened.

Stack trace

javax.servlet.ServletException: java.lang.NoClassDefFoundError: java/lang/ReflectiveOperationException
	at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:795)
	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:875)
	at org.kohsuke.stapler.MetaClass$12.dispatch(MetaClass.java:391)
	at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:745)
	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:875)
	at org.kohsuke.stapler.MetaClass$12.dispatch(MetaClass.java:391)

[Gaurav Negi]

1. I installed Gerrit 2.10 and integrated it with Jenkins.

2. On jenkins side I have installed "Gerrit Trigger" plugin. 

Followed all steps as mentioned here

https://wiki.jenkins-ci.org/display/JENKINS/Gerrit+Trigger

3. Also created a jenkins job, that will get triggered by "Gerrit Event", picked right Gerrit server. etc

But not sure why, the jenkins jobs is not getting triggered when I push a new commit to Gerrit. 

Any input or where to look for is highly appreciated.

Thanks

-Gaurav

[Gaurav Negi]

All,

   The issue was the Java version. 

I was using open jdk 1.6 on Jenkins master.

"Gerrit Trigger" plugin works on jdk 1.7. 

After Upgrading to JDK 1.7, it started working.

Thanks

-Gaurav

[David Ostrovsky]

Am Dienstag, 8. März 2016 00:56:57 UTC+1 schrieb Gaurav Negi:

All,

   The issue was the Java version. 

I was using open jdk 1.6 on Jenkins master.

"Gerrit Trigger" plugin works on jdk 1.7. 

After Upgrading to JDK 1.7, it started working.

Yeah, this is a known issue: [1], that was caused by this diff: [2].

* [1] https://issues.jenkins-ci.org/browse/JENKINS-30857

* [2] https://github.com/jenkinsci/gerrit-trigger-plugin/commit/a5d44ea9dc6b42de7aeb63371a42b607e4578fb2

[David Pursehouse]

*sigh* If only someone had commented on the commit that broke it, I
would have fixed this already.

Should be fixed by this PR:

https://github.com/jenkinsci/gerrit-trigger-plugin/pull/276

[David Pursehouse]

Java 6 runtime compatibility is fixed in version 2.18.4 of the Gerrit
Trigger Plugin.

[David Ostrovsky]

Thanks for the quick fix, David.

[Gaurav Negi]

Thanks David, I was using Openjdk1.6 on Jenkins master.
I was seeing the issue there with Gerrit Trigger plugin version 2.18.4
It got fixed when I upgraded to Openjdk 1.7



Sent from my iPhone

[David Pursehouse]

No problem. I would have already fixed it in October if I'd known about
it :-/

Bobby also added the "animal sniffer" plugin to the test phase of the
build, which will detect runtime violations and prevent this kind of bug
from happening again.

[Anushree Ganjam]

Hi,

Jenkins version : 1.647
Gerrit Trigger : 2.18.3

AWS Server configuration
16 Cores, 30GB RAM.

We have setup gerrit and jenkins in AWS systems for Android ecosystem.
When a +1 is given in gerrit, we want jenkins to start the android build.
The jenkins jobs works well sometimes, but misses the event many times.
Only if we restart the jenkins , the job starts working well.
But after sometime same problem happens.
We have internal memory of 99GB where jenkins is installed and jobs-> workspace is in /mnt folder of AWS. There is no problem in output of the job.
Problem is that job is not starting for gerrit event. How do we solve this?

Thanks for the help in advance

[Matthias Sohn]

did you try to configure gerrit-trigger's watchdog ?

the watchdog configuration is hidden here:

Manage Jenkins > Gerrit Trigger > Edit > Advanced > Watchdog

You could also try the missed event replay feature [1]

[1] https://wiki.jenkins-ci.org/display/JENKINS/Gerrit+Trigger#GerritTrigger-MissedEventsPlaybackFeature%28Availablefromv.2.14.0%29

-Matthias

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[Anushree Ganjam]

Hi,
Connection Watchdog Timeout is set to 0
Should i change this value?


Now, Everyday i am restarting jenkins since the changes on gerrit is not triggering builds on jenkins.

[Matthias Sohn]

according to the documentation the watchdog is switched off if timeout is 0. 

I have set it to 10 minutes and switched off the watchdog on the weekend since we don't expect changes on the weekend

[Anushree Ganjam]

Thanks a lot Matthias Sohn,
I have added 10 now.

As per the explanation : The time in minutes the watchdog should wait for any events from Gerrit before the connection is restarted.
Does this mean, for every 10minutes, if there is no event from gerrit to jenkins -> Will it restart the connection?
Where can we check the logs for this connection restart?

[Anushree Ganjam]

Facing same problem again today.
Can anyone guide me please how to check the connection logs between jenkins and gerrit.
How to check watchdog logs for connection restart?

Please help.

[Anushree Ganjam]

Hi,
For 4days the gerrit trigger was working well.
Today gerrit trigger stopped working.
Today again I had to restart the jenkins for this to work well.
Please can anyone guide me on why is this problem happening?

On Monday, May 9, 2016 at 12:12:18 PM UTC+5:30, Matthias Sohn wrote:

[manideep lanka]

Hi Anushree!
I am trying to setup jenkins trigger too. But I get this error: Connection error : com.jcraft.jsch.JSchException: java.net.UnknownHostException.
Can you guide me or point me to some resource on how to configure the Gerrit trigger plugin?

[Gert van Dijk]

UnknownHostException is most likely related to DNS; failure to resolve a hostname to an IP address. Do you get this error on a build that triggered or in general when starting Jenkins and configuring the plugin?

Verify that the connection to Gerrit can be set up in Manage Jenkins -> Gerrit Trigger -> Gerrit Servers section and displays the Gerrit version etc.