Not having seen the source code, I'd hope that task used the standard
Java create tempfile method, which "should" only fail if either the temp file directory is on a disk with insufficient free space or if somehow you're not permitted access rights to create a file in the temp file directory.
The secret of how to be miserable is to constantly expect things are going to happen the way that they are "supposed" to happen.
You can have faith, which carries the understanding that you may be disappointed. Then there's being a willfully-blind idiot, which virtually guarantees it.