Can't import schemas in classpath when generating JAXB

Question

I'm trying to create schemas that are used to provide basic components for more complex schemas, using the same design idea behind creating abstract Java classes and then extending them. I'm having trouble referring to classes in different modules, though. Below is the start of a schema that refers to a schema that is stored in another jar file:
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
    targetNamespace="http://xml.kitfox.com/schema/tw/ts"
    elementFormDefault="qualified"
    xmlns:tns="http://xml.kitfox.com/schema/tw/ts"
    xmlns:cmn="http://xml.kitfox.com/schema/common">
    <xsd:import schemaLocation="/com/kitfox/common.xsd" namespace="http://xml.kitfox.com/schema/common"/>
    <xsd:complexType name="sourceType">
        <xsd:attribute name="uid" type="cmn:uidType"/>
    </xsd:complexType>I'm generating my JAXB with the following task:
    <target name="bind-preferences" depends="init">
        <taskdef name="xjc" classname="com.sun.tools.xjc.XJCTask">
            <classpath>
                <pathelement path="${javac.classpath}"/>
            </classpath>
        </taskdef>
        <xjc destdir="gen" extension="true" removeOldOutput="true">
            <schema dir="src">
                <include name="**/*.xsd"/>
            </schema>
            <produces dir="gen">
                <include name="**/*.java"/>
            </produces>
        </xjc>
    </target>Unfortunately, this causes the following error:
[WARNING] schema_reference.4: Failed to read schema document '/com/kitfox/common.xsd', because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>.
  line 9 of file:/C:/dev/kitfox.com/gameEngine/proj/tileWorld/src/com/kitfox/tw/ts.xsd
[ERROR] src-resolve: Cannot resolve the name 'cmn:uidType' to a(n) 'type definition' component.
  line 24 of file:/C:/dev/kitfox.com/gameEngine/proj/tileWorld/src/com/kitfox/tw/ts.xsd
[ERROR] src-resolve: Cannot resolve the name 'cmn:uidType' to a(n) 'simpleType definition' component.
  line 24 of file:/C:/dev/kitfox.com/gameEngine/proj/tileWorld/src/com/kitfox/tw/ts.xsdI know that the classpath passed into the xjc task contains the jar with my original schema. What can I do so that JAXB finds it? Also, how would I tell JAXB to extend the classes already generated for common.xsd in my original jar rather than regenerating them in the jar I'm compiling?

Answer 1

Thanks. I've looked into using a catalog (the ant task allows you to specify a catalog), but don't think I've got the syntax right. Does the following look right to you?
<!DOCTYPE catalog
  PUBLIC "-//OASIS//DTD Entity Resolution XML Catalog V1.0//EN"
         "http://www.oasis-open.org/committees/entity/release/1.0/catalog.dtd">
<catalog xmlns="urn:oasis:names:tc:entity:xmlns:xml:catalog"
         prefer="public">
  <uri name="common.xsd"
   uri="../gb/src/com/kitfox/common.xsd"/>
</catalog>I've changed my schema to look like:
<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
    targetNamespace="http://xml.kitfox.com/schema/tw/ts"
    elementFormDefault="qualified"
    xmlns:tns="http://xml.kitfox.com/schema/tw/ts"
    xmlns:cmn="http://xml.kitfox.com/schema/common">
    <xsd:import schemaLocation="common.xsd" namespace="http://xml.kitfox.com/schema/common"/>
    <xsd:complexType name="sourceType">
        <xsd:attribute name="uid" type="cmn:uidType"/>
    </xsd:complexType>I'm still getting errors:
[WARNING] schema_reference.4: Failed to read schema document 'common.xsd', because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>.
  line 9 of file:/C:/dev/kitfox.com/proj/tw/src/com/kitfox/tw/ts.xsd
[ERROR] src-resolve: Cannot resolve the name 'cmn:uidType' to a(n) 'type definition' component.
  line 24 of file:/C:/dev/kitfox.com/proj/tw/src/com/kitfox/tw/ts.xsd
[ERROR] src-resolve: Cannot resolve the name 'cmn:uidType' to a(n) 'simpleType definition' component.
  line 24 of file:/C:/dev/kitfox.com/proj/tw/src/com/kitfox/tw/ts.xsdI've tried some variations such as leaving out the import/@schemaLocation attribute and hoping that the catalog could resolve that with the namespace alone or creating a fake http:// url for the schemaLocation, but none of that works. Would you know what I'm doing wrong with this catalog? The catalog and ant file are in the same directory and the relative path to the common.xsd file is correct.