This change is persistent across all on-domain machines, logins, and reboots. If you have not manually changed this, then you are using bash, and these scripts will work as intended. This change is not retroactive, so it will not work on shells and terminals already open (except for the one you sourced the script from). These scripts are designed to modify your local bashrc profile (located at '$HOME/.bashrc') so that any new bash spawning terminals or bash shells you start will make your default Java run with the selected version as well as the shell you sourced the script from. Bash is the default shell.
You can change your own Java version to what you need, as the Linux Lab image contains multiple versions of Java. All on-domain Red Hat Enterprise Linux systems run a certain Java version as the default.
