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Bear with me, I'm new to sysadmin stuff. We have a server running RHEL 6 (2.6.32). We have a Pentaho application that interacts with the server as a pentaho user, and we have a team user under whose home directory most of our work is stored (we have reasons and are working on separate logins for this).

The problem is that the pentaho user can no longer save files to the team user's directory, despite never having an issue with this before. Nothing has changed as far as permissions are concerned.

It appears to be an issue with the version of Java (looks like JDK 1.8.0 got installed) that the user/application is using, so my question is this: how can I control the specific version of Java used by or seen by a specific user or application? How can I tell what versions of JDK are available?

Engineero
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    It is indeed a very vague question, you could improve it by including the installed versions and software (if you don't know them, then include the questions as how to find out). Also specify what do you mean by a "pentaho user", I'm assuming it's the process user for the pentaho system, but it might be a user within pentaho who is trying to upload. You should also specify how did you install java. – Leo Gallego Jul 21 '18 at 01:22
  • @Leo thanks for the suggestions. I made some improvements to the question. I hope it is clearer now... – Engineero Jul 23 '18 at 13:56
  • Add/change values of the `$PATH` and `$JAVA_HOME` to appropriate values in the appropriate places to control a single user or a specific application/service on start up – ivanivan Jul 23 '18 at 13:56

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Quoting Red Hat's documentation:

/usr/sbin/alternatives is a tool for managing different software packages that provide the same functionality. Red Hat Enterprise Linux uses /usr/sbin/alternatives to ensure that only one Java Development Kit is set as the system default at one time.

You might be able to see and configure multiple versions of Java using the alternatives utility, as root or with sudo.

Configure java:

/usr/sbin/alternatives --config java

For the compiler:

/usr/sbin/alternatives --config javac

But this will set the default java for the system, not for a specific user or application, which might have it's custom settings.

Leo Gallego
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