I would like to find out the values of all Maven properties as they apply to some Maven project. mvn help:system lists OS environment variables and
mvn help:system
I don't know how to get them "officially", but here is a workaround. Add maven-antrun-plugin to your project and run mvn test -X. The plugin will show all properties passed to it from Maven. The list looks complete to me.
maven-antrun-plugin
mvn test -X