Which safe template engine to use?

Question

Java

Advise a safe template engine that does NOT compile templates into JAVA classes, does not allow executing JAVA code, climbing the file system, calling methods on passed objects, laying down jvm, and so on.
Task: to provide users with the ability to independently edit site templates so that they cannot get out where they do not need to ..
Thank you!

Answer 1

Then you need not a template engine, but some markup language. For example, markdown
https://github.com/myabc/markdownj
If you need to manipulate your additional objects, just fork and add a handler