> I suspect it basically breaks Maven, since Maven jars aren't valid for Jigsaw. What do you mean by that? Maven JARs are just normal JARs downloaded with Mave

> I suspect it basically breaks Maven, since Maven jars aren't valid for Jigsaw. What do you mean by that? Maven JARs are just normal JARs downloaded with Maven. They are therefore valid in both the classpath and the module path (as automatic modules). Jigsaw modules are just normal JARs with a module-info.java, there is nothing preventing you form managing them with Maven. In fact in already have several of them in Maven Central, they went through the SonaType quality check without issues. In fact the compiler plugin will detect if a dependency in a modular JAR and if so put in the module path rather than the classpath (the javadoc plugin does not yet).