Javac –add-modules Add multiple modules

I have a very simple Java class

public class TestAnnotation {
    public static void main(String[] args) {
        System.out.println(javax.annotation.Generated.class.getName());
    }
}

As expected, this will not compile with JDK 9

"c:\Program Files\Java\jdk-9.0.1\bin\javac.exe" TestAnnotation.java
TestAnnotation.java:3: error: package javax.annotation is not visible
                System.out.println(javax.annotation.Generated.class.getName());
                                        ^
  (package javax.annotation is declared in module java.xml.ws.annotation, which is not in the module graph)
1 error

Ignoring the error message (and using java.xml.ws instead of the suggested java.xml.ws.annotation), I can compile with it

"c:\Program Files\Java\jdk-9.0.1\bin\javac.exe" --add-modules java.xml.ws TestAnnotation.java

However, looking at the module graph module java.xml.ws does not depend on the module java .xml.ws.annotation, which exports the javax.annotation package. p>

How is this possible to compile (by the way, run)?

java.xml.ws does rely on java.xml.ws.annotation: http://hg.openjdk.java.net/jdk/jdk/file/68c6f57c40d4/src/java.xml.ws/share/classes/module-info.java#l46

module java.xml.ws {
    requires java.desktop;
    requires java.logging;
    requires java.management;
    requires java.xml.ws.annotation;
    ...

I don’t know why this dependency is missing in this picture. Probably they only want to show key links.