How to run jenkins in jdk 1.6

Panikera Raj

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Aug 26, 2016, 5:23:01 AM8/26/16

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Hi All,

I have a problem, please do help me on this

First I have installed JDK 1.7 in windows-64 bit machine, then I have started jenkins, in jenkins i have created some projects Called Android and I was able executing successfully, But later I am facing some issue in Android project, so I have downgraded My Java JDK to 1.6, Here only my actual problem started,

After downgrading java version I am trying run jenkins, but I am facing blow exception.

D:\Jenkins>java -jar jenkins.war

Jenkins requires Java7 or later, but you are running 1.6.0_21-b06 from C:\Program Files\Java\jdk1.6.0_21\jre

java.lang.UnsupportedClassVersionError: 50.0 at Main.main (Main.java:83)

D:\Jenkins>

Please let me know how to resolve this issue. I don't have other chance to upgrade the Java version to 1.7, I have to use 1.6 only please help me on this.

your help will be highly appriciated

-Panikera

nicolas de loof

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Aug 26, 2016, 6:25:54 AM8/26/16

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You have to distinguish the JDK running jenkins and the JDK building your project. You can configure jenkins to build with arbitrary JDK, using Java installations on global configuration and selecting the adequate one for your jobs

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Panikera Raj

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Aug 26, 2016, 7:23:52 AM8/26/16

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Can you bit elaborate about this,

how cay achieve this, is there any configuration file where I can specify to use JDK 1.6

-Panikera

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Panikera Raj

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Aug 26, 2016, 7:31:54 AM8/26/16

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FYI...

I have uninstalled JDK 1.7 version.

-Panikera

Chris Selwyn

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Aug 26, 2016, 7:36:21 AM8/26/16

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You cannot run Jenkins itself on anything less than JDK 7.
What Nicolas was saying was that it is, however, still possible to have
Jenkins build with JDKs less that JDK 7 by adding them to the Jenkins
configuration using the setting in "Manage Jenkins".

So you need to have at least JDK 7 installed and then whatever other
JDKs that you wish to use to perform builds.

Chris Selwyn

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Panikera Raj

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Aug 26, 2016, 7:48:21 AM8/26/16

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I have other windows setup which I had JDK 1.6, there I can start jenkins successfully and using for daily activities.

-Panikera

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Chris Selwyn

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Aug 26, 2016, 8:04:33 AM8/26/16

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I suggest you read https://jenkins.io/blog/2015/04/06/good-bye-java6/.

Chris Selwyn

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Panikera Raj

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Aug 26, 2016, 8:09:28 AM8/26/16

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I got the issue, Looks like backward compatibility is not there for jenkins. after downgrading jenkins version it is able to start with JDK 1.6. Not sure what is behind do not support for older version.

anyway thanks guys, much appreciated your help.

-Panikera

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Björn Pedersen

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Aug 26, 2016, 10:11:05 AM8/26/16

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Hi,

You should really read the blog post. Jenkins itself need at least JDK1.7 to run (actually only a JRE1.7) . But you can install more than one jdk on a machine, so the jobs can use an older jdk to build soemthing.
To configure the available jdks, go to 'manage jenkins' -> 'Configure tools'.

Björn

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