The documentation does not speak about usage of java.io.tmpdir and configuration of it.
The documentation mention "jboss.server.tmp.dir" but it not configurable at project-defaults.yaml,
It also does not speak about thorntail.io.tmpdir, and it configurable only at "java -jar -Dthorntail.io.tmpdir"
Source Code: swarm/bootstrap/util/TempFileManager.java
Temporary directory may should configurable at .yaml file.
At Windows the Thorntail does not clean up temp directory after the Ctrl + C is pressed: 2020-02-21 11:24:57,639 ERROR [stderr] (Thread-2) java.nio.file.FileSystemException: <path>\temp\thorntailsecurity-2.6.0.Final2351621062927122840.jar: The process cannot access the file because it is being used by another process.