Jenkins specifying JAVA HOME

Question

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

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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

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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    lt your desired jvm gt  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

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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

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Your JAVA HOME variable must be set to  usr lib jvm java-6-openjdk and it must be available  for the user that starts Jenkins   From Kyle Strand comment   As of April 2015  I think   Jenkins requires Java7  Also note that the java binary path  JAVA  must be set to the correct version if the system default is still Java 6  Finally  for anyone wondering where these variables are set  it s in a config file listed with the installation instructions on the Jenkins webpage  e g  for Debian it s  etc default jenkins

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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     lt env name  JENKINS HOME  value   BASE    gt   lt  -- 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  -- gt   lt executable gt C  Program Files Java jre1 8 0 171 bin java lt  executable gt   lt arguments gt -Xrs -Xmx256m -Dhudson lifecycle hudson lifecycle WindowsServiceLifecycle -jar   BASE  jenkins war  --httpPort 8080 --webroot   BASE  war  lt  arguments gt    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    lt env name  JENKINS HOME  value   BASE    gt   lt  -- 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  -- gt   lt executable gt  JAVA HOME  bin java lt  executable gt   lt arguments gt -Xrs -Xmx256m -Dhudson lifecycle hudson lifecycle WindowsServiceLifecycle -jar   BASE  jenkins war  --httpPort 8080 --webroot   BASE  war  lt  arguments gt

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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

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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 as path and jenkins didn t complain anymore

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In Jenkins try setting JAVA HOME to  usr lib jvm java-6-openjdk

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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

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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

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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

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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

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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

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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

[java] Jenkins, specifying JAVA_HOME

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