If you are getting an "Invalid Java version" error when trying to start Jenkins, it may be because the version of Java that Jenkins is trying to use is not compatible or is not installed correctly.

Here are a few things you can try to resolve this issue:

  1. Make sure that you have a compatible version of Java installed on your system. Jenkins requires at least Java 8 to run. You can check the version of Java installed on your system by running the command java -version.
  2. Make sure that the JAVA_HOME environment variable is set correctly. Jenkins uses this variable to locate the Java installation. You can check the value of this variable by running the command echo $JAVA_HOME.
  3. Make sure the java executable is in the PATH environment variable.
  4. If you have multiple version of java installed, you should select one with the following command:

        sudo alternatives --config java

  1. If the above steps don't work, you can try reinstalling Java on your system, making sure to use a version that is compatible with Jenkins.
  2. If the problem persist, check the jenkins.log file located in the jenkins home directory, it should give you more information about the problem
  3. In some cases, the problem may be that Jenkins is trying to use a 32-bit version of Java on a 64-bit system or vice versa. You can check if this is the case by looking at the Jenkins log file or by running the command file /usr/bin/java, it should tell you if it's 32 or 64 bit.

If you still face problem after trying these steps, please provide me with the error message in the logs, so that I can assist you better.

 

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