OpenJDK: Can I copy OpenJDK JRE From Confluence to Jira ?

unknown

Linux self-hosted Confluence 6.13.4 using bundled JRE (OpenJDK).  Running on same server, Jira 7.6.3.  Planning to upgrade Jira to 7.13.3.

We'd like to switch Jira to OpenJDK.  7.13.3 will support OpenJDK, but still comes bundled with Oracle.

In test environment, we've upgraded Jira to 7.13.3 using the installer & all is well running with bundled Oracle JRE.

To switch Jira over to OpenJDK, can I simply shutdown & copy the JRE from the Confluence install on the same server?  In testing this appears to work without issue, but not sure if this is an "approved" approach.

Eg, something like:

sudo su -
cd /opt/atlassian/jira
mv jre jre-bundled
cp -R ../confluence/jre .

unknown

The version is supported, that's not a concern -- https://community.atlassian.com/t5/Agile-articles/Java-11-OpenJDK-support-update-for-Server-and-Data-Center/ba-p/967836#M392

I'm interested in whether the JRE installation method is acceptable.

The documentation I've seen indicates you can install <other JRE/JDK> at <anywhere else on the server> and update JAVA_HOME to point at it.  There's no mention of just replacing the bundled "jre" directory entirely.

I'm pretty sure this'll be OK, but it'd be nice to have someone else confirm it.