How to change the JDK for a Jenkins job?

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enter image description here I have imported the jenkins jobs from existing jenkins server from another machine. But the problem is, it has the JDK referenced as per the old machines and I want to change it to use the JDK configured in my new jenkins. But I am unable to find any way of doing this. So, please if you have come across this situation and found a way then please help me too.

Thanks.

Intra answered 2/3, 2015 at 13:2 Comment(0)

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There is a JDK dropdown in "job name" -> Configure in Jenkins web ui. It will list all JDKs available in Jenkins configuration.

As per @Derek comment below, n newer versions, you can find it in Manage Jenkins -> Global Tool Configuration -> JDK.

Note that you need the "Overall/Administer" permission to manage Jenkins.

Schmaltz answered 2/3, 2015 at 13:5 Comment(11)

This, we will get while created new job but not while editing the existing job. I might be wrong as I have just started to configure jenkins. – Intra 2/3, 2015 at 13:7

It is also configurable in existing jobs. Open the Jenkins web ui, go into the job configuration - the JDK dropdown in one of the first configuration items. – Schmaltz 2/3, 2015 at 13:8

Sorry, i am not able to find it. The config sections I have are: Advanced Project Options, Source Code Management, Build Triggers, Pre Steps, Build, Post Steps, Build Settings, Post-build Actions. – Intra 2/3, 2015 at 13:10

Is this a maven project? You should see "common" configs like Maven project name, Description etc right at the top of the Configuration page - this section includes JDK in my Jenkins. – Schmaltz 2/3, 2015 at 13:15

Yes, It is Maven Project. You can have a look at snapshot I have updated in the question. – Intra 2/3, 2015 at 13:23

I am getting the JDK drop down in my old jenkins UI. Now sure why it is available in the new one. – Intra 2/3, 2015 at 13:33

Got it. I had error while configuring the JDK location in the manage jenkins section because of which it didn't have anything to show in the dropdown. – Intra 2/3, 2015 at 14:7

latest Jenkins version 2.7.4 is: Manage Jenkins -> Global Tool Configuration -> JDK – Tortuous 13/1, 2017 at 16:35

Just a comment for explaining details: if you configured JDK correctly and you have more than one JDK configured in your Jenkins, you can easily find it in job-configure. – Rookie 8/5, 2017 at 2:48

Is it possible the if there is only one jdk it does not show the option in project and take that one which is set? – Nibelung 22/2, 2021 at 22:39

It seems jdk option is not available while edit if there is only one jdk in Jenkins. – Nibelung 23/2, 2021 at 8:10

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For existing jobs you're editing, the JDK drop-down choice may not be available if you've just added a single JDK config in the 'Configure System' Jenkins settings.

However, it is available for new jobs.

Surprisingly, if you add a second JDK config, it becomes available in an existing job too.

This looks to me like a bug (tested in Jenkins ver. 1.629).

See a similar issue raised here: JDK selection is hidden even when a JDK is configured

Cantone answered 23/3, 2016 at 10:49 Comment(5)

yes that 's right, but even the JDK dropdown occurred, the build always get error for maven cannot find the java – Auspicious 1/5, 2018 at 19:17

still a problem in 2.107.3 ... just wasted 30mins of my life – Bisk 30/5, 2018 at 9:47

The above workaround solved my issue. Still an issue in 2.138.3 – Semiquaver 11/12, 2018 at 18:19

Exactly! I had to add another JDK in the Global Config section, and then it showed up in the job deployment config section. Thanks a lot. – Citrin 30/12, 2019 at 4:47

It seems this is true. Job is working but no jdk option is available. – Nibelung 23/2, 2021 at 8:7

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Here is where you should configure in your job:

In JDK there is the combobox with the different JDK configured in your Jenkins. Job

Here is where you should configure in the config of your Jenkins:

Jenkins general config

Douse answered 2/3, 2015 at 13:27 Comment(5)

I am getting the JDK drop down in my old jenkins UI. Not sure why it is available in the new one – Intra 2/3, 2015 at 14:3

Are JDKs configured in Manage Jenkins -> Configure System -> JDK installations? – Schmaltz 2/3, 2015 at 14:5

Got it. I had error while configuring the JDK location in the manage jenkins section because of which it didn't have anything to show in the dropdown. – Intra 2/3, 2015 at 14:8

There is no such JDK section. – Mireyamiriam 1/12, 2016 at 18:27

The JDK section is in Manage Jenkins -> Global Tool Configuration now. – Justiciar 2/7, 2017 at 21:56

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Using latest Jenkins version 2.7.4 which is also having a bug for existing jobs.

Add new JDKs through Manage Jenkins -> Global Tool Configuration -> JDK ** If you edit current job then JDK dropdown is not showing (bug)
Hit http://your_jenkin_server:8080/restart and restart the server
Re-configure job

Now, you should see JDK dropdown in "job name" -> Configure in Jenkins web ui. It will list all JDKs available in Jenkins configuration.

Springs answered 21/9, 2016 at 5:44 Comment(2)

Restart was key, so this answer combined with the @Schmaltz answer did the trick for me. (Using Jenkins v2.32.3) – Foredoom 15/3, 2017 at 12:24

This doesn't work for pipeline projects - so had to explicity reference JDK version in jenkinsfile – Polyzoic 12/9, 2022 at 18:55

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Here is my experience with Jenkins version 1.636: as long as I have only one "Install automatically" JDK configured in Jenkins JDK section, I don't see "JDK" dropdown in Job=>Configure section, but as soon as I added second JDK in Jenkins config, JDK dropdown appeared in Job=>Configure section with 3 options [(System), JDK1, JDK2]

Mikiso answered 3/11, 2015 at 15:36 Comment(1)

This is similar to my experience with Jenkins 1.647, however in my case JDK1 was an explicitly named JDK. Only when I added a second did I get the option to specify the "JDK to be used for this project" and got the three options – Soakage 25/2, 2016 at 15:4

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Hello it is possible set a new JDK in old job, if you use the Pipeline. You just write something like this:

pipeline{
 agent any
 tools{
     jdk 'deafault'
 }
 stages{ 
    stage('build'){
       ..............
       }
    } 
 } 
}

Where default is just the name that you give to the JDK when you config it in the Jenkins configuration Global System.

Maziemazlack answered 6/9, 2021 at 12:51 Comment(0)

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If you have a multi-config (matrix) job, you do not have a JDK dropdown but need to configure the jdk as build axis.

Bassoon answered 5/9, 2018 at 9:28 Comment(0)

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Be careful with jobs

1 - if you have a job based in maven, Jenkins takes your default java configuration and you decide the compilation level in your POM.XML.

2 - if you have a free style job, in the the configuration option of the job you can select the JDK that you want to use.

Hope this help.

Guernica answered 19/11, 2015 at 18:33 Comment(0)

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For those who couldn't find this option. Install JDK Parameter Plugin

Kimberly answered 4/7, 2017 at 17:9 Comment(0)

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I had the same issue (running Jenkins v2.303.1) and I needed to add new JDKs before I saw them in the project settings.

Go to "Manage Jenkins (in german: Jenkins verwalten)", then "Configuration of tools (in german: Konfiguration der Hilfsprogramme)" and there should be a section regarding "JDK". Here, you can manage your different java versions (whether to download or use local ones): Picture of JDK section

After setting these JDKs I was able to choose which JDK version to use: JDK choose option

Volvulus answered 1/9, 2021 at 7:46 Comment(0)

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you should only add this path to Manage Jenkins -> Global Tool Configuration -> JDK

for java 11

/usr/lib/jvm/java-11-openjdk-amd64

for java 8

/usr/lib/jvm/java-8-openjdk-amd64

Ethology answered 11/11, 2022 at 17:52 Comment(0)

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