JAXB class generation with imported XSD and binding

Question

I am trying to generate classes from following common.xsd which imports x.xsd and y.xsd.

common.xsd is as follows:

<?xml version="1.0"?>
    <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
    <xs:import namespace="mynamespace:x" schemaLocation="x.xsd"/>
    <xs:import namespace="mynamespace:y" schemaLocation="y.xsd"/>
</xs:schema>

I try to use a binding file that specifies a common interface that is to be implemented by the generated classes. My binding file is as follows:

jaxb:extensionBindingPrefixes="inheritance" version="2.1">

<jaxb:globalBindings> 
    <jaxb:javaType name="java.lang.Long" xmlType="xsd:integer"/> 
</jaxb:globalBindings>

<jaxb:bindings schemaLocation="common.xsd" node="/xsd:schema">

    <jaxb:bindings node="xsd:complexType[@name='Customer']">
        <inheritance:implements>jaxb.BaseMessage</inheritance:implements>
        <jaxb:class />
    </jaxb:bindings>

    <jaxb:bindings node="xsd:complexType[@name='Payments']">
        <inheritance:implements>jaxb.BaseMessage</inheritance:implements>
        <jaxb:class />
    </jaxb:bindings>

I tried to generate the code but it complains that:

[ERROR] XPath evaluation of "xsd:complexType[@name='Customer']" results in empty target node
[ERROR] XPath evaluation of "xsd:complexType[@name='Payments']" results in empty target node

How can I define the nodes in the bindings files are actually in the individual external XSD files but not in common.xsd?

Answer 1

I'm posting a second answer because I believe what you are trying to achieve is possible without vendor extensions, but I also think that my original answer may be useful to others who need vendor extensions.

This example also removes the namespaces, but they could be added back easily. The same build script is used for this answer as in my previous one.

src/main/resources/bindings.xjb:

<?xml version="1.0" encoding="UTF-8"?>
<jaxb:bindings xmlns:xsd="http://www.w3.org/2001/XMLSchema"
    jaxb:version="2.1"
    xmlns:jaxb="http://java.sun.com/xml/ns/jaxb"
    xmlns:xjc="http://java.sun.com/xml/ns/jaxb/xjc"
    jaxb:extensionBindingPrefixes="xjc"
    xmlns:common="schema/common.xsd">

  <jaxb:globalBindings>
    <jaxb:javaType name="java.lang.Long" xmlType="xsd:integer" />
    <xjc:superInterface name="jaxb.BaseMessage" />
  </jaxb:globalBindings>

</jaxb:bindings>

src/main/resources/schema/common.xsd:

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema version="1.0" xmlns:xsd="http://www.w3.org/2001/XMLSchema">

  <xsd:include schemaLocation="x.xsd" />
  <xsd:include schemaLocation="y.xsd" />

  <xsd:complexType name="CustomerPayments">
    <xsd:sequence>
      <xsd:element name="customer" type="Customer" />
      <xsd:element name="payments" type="Payments" />
    </xsd:sequence>
  </xsd:complexType>

</xsd:schema>

src/main/resources/schema/x.xsd:

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema version="1.0" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    <xsd:complexType name="Customer">
      <xsd:sequence>
        <xsd:element name="name" type="xsd:string" />
      </xsd:sequence>
    </xsd:complexType>
</xsd:schema>

src/main/resources/y.xsd:

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema version="1.0" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    <xsd:complexType name="Payments">
      <xsd:sequence>
        <xsd:element name="amount" type="xsd:float" />
      </xsd:sequence>
    </xsd:complexType>
</xsd:schema>