While running QS integration tests a following warning message can be observed:

[INFO] --- surefire:2.22.2:test (default-test) @ temperature-converter ---
[WARNING] Parameter 'systemProperties' is deprecated: Use systemPropertyVariables instead.

It seems it would be sufficient to update:

• the wildfly-quickstart-parent version from 2 to 3 (to start using jboss-parent version 39)
• the jboss-parent version from 37 to 39 in root pom.xml

in order to eliminate the warning.