escapeWindowsPath doesn't work when applying properties

The attached project contains a property file "src/test/main/hibernate.properties". I'd like to inject the projects build path into that file. More precisely, I have a property "jdbc.url" in my pom.xml, which looks like this:

<jdbc.url>jdbc:derby:${project.build.directory}/derby-db;create=true</jdbc.url>

In hibernate.properties, I have

hibernate.connection.url=${jdbc.url}

Which resolves to

hibernate.connection.url=jdbc:derby:C:\workspace\mydemo\target/derby-db;create=true

which is invalid, because the backslashes aren't escaped.