As of PeopleTools 8.53 you might get the following error when running ENCRYPT_PASSWORD *; in data mover:
Error: Process aborted. Possibly due to JVM is not available or missing java class or empty password.
Per the notes on The Smart Panda site, PeopleTools 8.53+ has a new salt component and this uses Java for encryption.
To fix you need to add %PS_HOME%\jre\bin\ to Windows your path:
Control Panel > System > Advanced > Environment Variables (or search settings for Edit the System Environment Variables).
Scroll through System Variables and find PATH, and append the location of %PS_HOME%\jre\bin\ to the end e.g.
Note once you do this, you need to close and re-open data mover for it pick up the new path.