Openness propagation incomplete

[bravehorsie]

JAXB-API propagates opennes to implementation module in a way that if a module is open to java.xml.bind it should be also open to an implementation for example com.sun.xml.bind.

Problem arises when classes used as root element properties are from other package than root elements.

package com.foo;
@XmlRootElement
class A {
  @XmlElement
  private B b;
}

package com.bar;
@XmlRootElement
class B {
  @XmlElement
  private String b;
}

If above classes are declared in a module com.app and that module declares openness to java.xml.bind' as suggested by JAXBContext#newInstance` javadoc:

module com.app {
  requires java.xml.bind;
  opens com.foo to java.xml.bind;`
  opens com.bar to java.xml.bind;
}

Then if JAXB is called with JAXBContext.newInstance(A.class);, JAXB API propagates openness of com.foo to com.sun.xml.bind however it doesn't scan classes for JAXB annotations during SPI discovery and so fails to propagate openness for com.bar.