java - JAXB SchemaFactory source order must follow import order between schemas?

Question

Using latest JAXB (Sun) and have a hierarchy of schemas that use import directives between schemas to share type definitions. Schema validation is activated on the setSchema call to Marshaller/Unmarshaller in JAXB which should defer validation to Xerces (using Java 1.5). I don't want to know the order of import directives between schemas when creating the Schema object with SchemaFactory. Unfortunately, I haven't found a Xerces feature/property that allows for this. For example, if a.xsd is pulled into b.xsd with an import then the following code doesn't work:

FileInputStream a = new FileInputStream("a.xsd");
FileInputStream b = new FileInputStream("b.xsd");

Schema schema = SchemaFactory.newInstance(
   XMLConstants.W3C_XML_SCHEMA_NS_URI).newSchema(
      new Source[] { 
          new StreamSource(b),
          new StreamSource(a) 
      }
   );

The order of the Source array has to be a.xsd then b.xsd. Any way around this?

Answer 1

What if you create a schema on the root Source, and then set a ResourceResolver (LSResourceResolver) to resolve the other imported schemas during the schema creation.