How to use a path relative to project root to H2 db-file configuration with Play Framework 2.4?

Ok, I did a little research and found this in the changelog (http://www.h2database.com/html/changelog.html):

Implicit relative paths are disabled (system property "h2.implicitRelativePath"), so that the database URL jdbc:h2:test now needs to be written as jdbc:h2:./test.

In H2 starting from version 1.4.177 Beta, implicit relative paths are not allowed anymore. Therefore, in your case the url should be written with a explicit relative path: db.default.url="jdbc:h2:./data/db".

A fixed or relative path can be used. When using the URL jdbc:h2:file:./data/sample http://www.h2database.com/html/faq.html

now a relative path can be used.

for example, jdbc:h2:file:./../../h2db;