How to change the JDK for a Jenkins job?

Question

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.

Answer 1

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

Answer 2

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.

Answer 3

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):

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

Answer 4

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.

Answer 5

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

Answer 6

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.

Answer 7

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

Answer 8

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

1. Add new JDKs through Manage Jenkins -> Global Tool Configuration -> JDK ** If you edit current job then JDK dropdown is not showing (bug)

2. Hit http://your_jenkin_server:8080/restart and restart the server

3. 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.

Answer 9

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

Answer 10

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]

Answer 11

Here is where you should configure in your job:

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

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