[java] Jenkins, specifying JAVA_HOME

I installed openjdk-6-jdk on my ubuntu box using apt-get.

In system info jenkins is telling me Java.Home is /usr/lib/jvm/java-6-openjdk/jre

However when I specify that directory as JAVA_HOME in Jenkins : "configure system", it returns error message saying that directory does not look like a jdk directory.

it is also failing to pick up my maven install.

Am I missing something obvious ?

Download package rpm package from http://pkg.jenkins-ci.org/redhat/ you can give additional java location like I have default 1.7 java in my system but I am using /opt/jdk1.8.0_60/bin/java for jenkins. Open jenkins startup script /etc/init.d/jenkins and add additional java here, I m case I have added /opt/jdk1.8.0_60/bin/java,

Search usable Java as /usr/bin/java might not point to minimal version required by Jenkins.

See http://www.nabble.com/guinea-pigs-wanted-----Hudson-RPM-for-RedHat-Linux-td25673707.html

candidates=" /opt/jdk1.8.0_60/bin/java

In Ubuntu 12.04 I had to install openjdk-7-jdk

then javac was working !

then I could use

/usr/lib/jvm/java-7-openjdk-amd64

I just wanted to add a solution for Windows machines.

• Windows Server 2008 R2 Standard, SP1
• Jenkins 2.89.4
• Java version 8.171

Symptom: Jenkins service starts and immediately stops.
Jenkins.wrapper.log has a line indicating the incorrect path to Java:

- Starting C:\Program Files\Java\jre1.8.0_141\bin\java -Xrs -Xmx6g -Dhudson.lifecycle=hudson.lifecycle.WindowsServiceLifecycle -jar "C:\Program Files (x86)\Jenkins\jenkins.war" --httpPort=8080 --webroot="C:\Program Files (x86)\Jenkins\war"

The fix: Jenkins has the path hard-coded in jenkins.xml. Change the path to the new Java location.

<env name="JENKINS_HOME" value="%BASE%"/>
<!--
if you'd like to run Jenkins with a specific version of Java, specify a full path to java.exe.
The following value assumes that you have java in your PATH.
-->
<executable>C:\Program Files\Java\jre1.8.0_171\bin\java</executable>
<arguments>-Xrs -Xmx256m -Dhudson.lifecycle=hudson.lifecycle.WindowsServiceLifecycle -jar "%BASE%\jenkins.war" --httpPort=8080 --webroot="%BASE%\war"</arguments>

You can also use Windows Environment Variables, but I wasn't successful with that and I don't think the Java installer updates those, so you'd need to update that by hand every time anyway.

<env name="JENKINS_HOME" value="%BASE%"/>
<!--
if you'd like to run Jenkins with a specific version of Java, specify a full path to java.exe.
The following value assumes that you have java in your PATH.
-->
<executable>%JAVA_HOME%\bin\java</executable>
<arguments>-Xrs -Xmx256m -Dhudson.lifecycle=hudson.lifecycle.WindowsServiceLifecycle -jar "%BASE%\jenkins.war" --httpPort=8080 --webroot="%BASE%\war"</arguments>

openjdk-6 is a Java runtime, not a JDK (development kit which contains javac, for example). Install openjdk-6-jdk.

Maven also needs the JDK.

[EDIT] When the JDK is installed, use /usr/lib/jvm/java-6-openjdk for JAVA_HOME (i.e. without the jre part).

In case anyone has similar problems, I used the default sudo apt-get installs for the relevant packages and here are the correct settings:

JAVA_HOME=/usr/lib/jvm/java-7-openjdk-i386

and

MAVEN_HOME=/usr/share/maven2

On CentOS 6.x and Redhat 6.x systems, the openjdk-devel package contains the jdk. It's sensible enough if you are familiar with the -devel pattern used in RedHat, but confusing if you're looking for a jdk package that conforms to java naming standards.

For those of you coming to this issue and have access to configure your Jenkins Agents, you can set the JAVA_HOME from the Jenkins > Nodes > "the agent name" > Configure page:

Setting "per agent" environment variables

Upgrading from Ubuntu 10.0.4 to 12.0.4 we got wrong footed. We had a JDK installation configured (auto-configured?) pointing to /usr/lib/jvm/java-6-openjdk this no longer contained a JDK, Changing to /usr/lib/jvm/default-java fixed, and should make for a seamless java-7 upgrade.

So in answer to the question: do not specify JAVA_HOME on Ubuntu.

I was facing the same issue and for me downgrading the JAVA_HOME from jdk12 was not the plausible option like said in the answer. So I did a trial and error experiment and I got the Jenkins running without even downgrading the version of JAVA_HOME.

Steps:

• open configuration $ sudo vi /etc/init.d/jenkins
• Comment following line:

 #JAVA=`type -p java`

• Introduced the line mentioned below. (Note: Insert the specific path of JDK in your machine.)

 JAVA=`type -p /usr/lib/jdk8/bin/java`

• Reload systemd manager configuration: $ sudo systemctl daemon-reload
• Start Jenkins service: $ sudo systemctl start jenkins

  ? jenkins.service - LSB: Start Jenkins at boot time
     Loaded: loaded (/etc/init.d/jenkins; generated)
     Active: active (exited) since Sun 2020-05-31 21:05:30 CEST; 9min ago
       Docs: man:systemd-sysv-generator(8)
    Process: 9055 ExecStart=/etc/init.d/jenkins start (code=exited, status=0/SUCCESS)
  

Using Jenkins 2 (2.3.2 in my case), the right way seems to insert the following into your pipeline file:

env.JAVA_HOME="${tool 'jdk1.8.0_111'}"
env.PATH="${env.JAVA_HOME}/bin:${env.PATH}"

"jdk1.8.0_111" beeing the name of the java configuration initially registered into Jenkins

i saw into Eclipse > Preferences>installed JREs > JRE Definition i found the directory of java_home so it's /Library/Java/JavaVirtualMachines/jdk1.7.0_17.jdk/Contents/Home

This is an old thread but for more recent Jenkins versions (in my case Jenkins 2.135) that require a particular java JDK the following should help:

Note: This is for Centos 7 , other distros may have differing directory locations although I believe they are correct for ubuntu also.

Modify /etc/sysconfig/jenkins and set variable JENKINS_JAVA_CMD="/<your desired jvm>/bin/java" (root access require)

Example:

JENKINS_JAVA_CMD="/usr/lib/jvm/java-1.8.0-openjdk/bin/java"

Restart Jenkins (if jenkins is run as a service sudo service jenkins stop then sudo service jenkins start)

The above fixed my Jenkins install not starting after I upgraded to Java 10 and Jenkins to 2.135

java jenkins java-home ubuntu centos

In Jenkins try setting JAVA_HOME to /usr/lib/jvm/java-6-openjdk