Jenkins Troubleshooting Tips Related to Path Errors
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Agent paths for a user are derived seperately from the linux user path
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So being ssh'd into a machine and running echo $PATH is not the true output

Instead, run the following from the node side script console in the Jenkins web gui

.. code-block:: groovy

   println System.getenv("PATH")

These variables are cached, to get to reload you may have to disconnect the node and relaunch it

Update java version
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.. code-block:: bash

   sudo update-alternatives --config java

The above will set the java variables accordingly