I've reduced my problem to a very simple maven project, located here as zip-file:

doing a mvn test runs fine with Java-11.

uncommenting

// requires transitive ch.qos.logback.classic;

in src/main/jave/module-info.java

and running mvn test again leads to an NPE.

Why does the mentioning of an existing module in module-info.java lead to an NPE?

This source code is a reduction of an existing project. It has been has been moved from Java-8 to Java-11.

The source code contains a LogbackConfigurator.java (implementing ch.qos.logback.classic.spi.Configurator).

LogbackConfigurator.java needs ch.qos.logback.classic in module-info.java in order to compile.

Am I doing something wrong, or is this a bug?

Any help welcome

Rolf