Properties disappear when starting build

When running a release build, properties given in order to build disappear.

In order to build a module, there are some properties required to build it. E.g. jdbcurl for the database to run an integration test. This property is required as there is no default. This works fine without using the maven-release-plugin. This also works also fine in case the property is set in settings.xml. But when running the release, all the properties given with -Dpropertyname=value do not reach the test. So it is not possible to build.