Resolving XSD's using Ivy - ant

Question

Forgive the double post but I am keen on an answer to this.
I would like some advice as to the approach I am taking. I am using Ivy for dependency management and am able to download and use all my jar files no issues. I would like to also run the <schemavalidate> task in Ant and would like to use Ivy to download the xsd's and dtd's as specified, thereby eliminating the need for a network connection after the initial download and also reducing my build time. I think I have a solution but wanted to run it
by some extra eyes for a sanity check and suggestions for possible improvements. Below is the relevant parts of my build scripts. The first call to retrieve uses my default ivysettings.xml and second call uses a settings file specific for retrieving xsd's and dtd's. Any feedback would be appreciated.
build.xml:
<project etc>
...
<target name="resolve" description="Retrieve dependencies with ivy">
<ivy:retrieve refresh="true"
sync="true"
conf="compile,war,runtime,test,findbugs"
pattern="${ivy.lib.dir}/[conf]/[artifact]-[revision].[ext]"/>
<ivy:settings id="xsd.settings"
file="${search.server.home}/ivysettings-xsd.xml"/>
<ivy:retrieve settingsref="xsd.settings"
refresh="false"
sync="false"
conf="xmlentities"
pattern="${ivy.lib.dir}/[conf]/[artifact].[ext]"/>
</target>
...
</project>
ivy.xml:
<ivy-module version="2.0" xmlns:e="http://ant.apache.org/ivy/extra">
<dependencies>
<!-- Jar files defined here but removed for brevity -->
...
<dependency org="beans" name="spring-beans" rev="3.0" conf="xmlentities->default">
<artifact name="spring-beans" type="xsd"/>
</dependency>
<dependency org="context" name="spring-context" rev="3.0" conf="xmlentities->default">
<artifact name="spring-context" type="xsd"/>
</dependency>
<dependency org="mvc" name="spring-mvc" rev="3.0" conf="xmlentities->default">
<artifact name="spring-mvc" type="xsd"/>
</dependency>
<dependency org="tool" name="spring-tool" rev="3.0" conf="xmlentities->default">
<artifact name="spring-tool" type="xsd"/>
</dependency>
<dependency org="util" name="spring-util" rev="3.0" conf="xmlentities->default">
<artifact name="spring-util" type="xsd"/>
</dependency>
<dependency org="javaee" name="javaee" rev="5" conf="xmlentities->default">
<artifact name="javaee_5" type="xsd"/>
<artifact name="web-app_2_5" type="xsd"/>
<artifact name="javaee_web_services_client_1_2" type="xsd"/>
<artifact name="jsp_2_1" type="xsd"/>
</dependency>
<dependency org="xmlschema" name="xmlschema" rev="2001" conf="xmlentities->default">
<artifact name="XMLSchema" type="xsd"/>
<artifact name="xml" type="xsd"/>
</dependency>
</dependencies>
</ivy-module>
ivysettings-xsd.xml:
<?xml version="1.0" encoding="UTF-8"?>
<ivysettings>
<settings defaultResolver="namespaces"/>
<resolvers>
<chain name="namespaces" returnFirst="true">
<url name="w3-org-ns" checksums="">
<artifact pattern="http://www.w3.org/2001/[artifact].[ext]"/>
</url>
<url name="javaee-ns" checksums="">
<artifact pattern="http://java.sun.com/xml/ns/javaee/[artifact].[ext]"/>
</url>
<url name="spring-ns" checksums="">
<artifact pattern="http://www.springframework.org/schema/[organisation]/[artifact].[ext]"/>
</url>
</chain>
</resolvers>
</ivysettings>
Ben

Answer 1

Interesting problem. Caching the Schema files enables off-line validation.
As Tom stated I think only a single retrieve is needed. (My example fetches both jars and schema files)
<ivy:retrieve pattern="${lib.dir}/[conf]/[artifact]-[revision].[ext]"/>
I've offered some changes to the ivy and settings files.
ivy.xml
I've used ivy extra attributes to assist with the generation of the Spring Schema URLs:
<ivy-module version="2.0" xmlns:e="http://ant.apache.org/ivy/extra">
<info organisation="com.myspotontheweb.demo" module="spring"/>
<configurations defaultconfmapping="compile->default">
<conf name="compile" description="Compile dependencies"/>
<conf name="schemas" description="XML schema files"/>
</configurations>
<dependencies>
<!-- Compile depedencies -->
<dependency org="org.springframework" name="spring-core" rev="3.0.6.RELEASE"/>
<!-- Schema dependencies -->
<dependency org="org.springframework" name="schemas" rev="3.0" conf="schemas->default">
<artifact name="spring-beans" e:framework="beans" type="xsd"/>
<artifact name="spring-context" e:framework="context" type="xsd"/>
<artifact name="spring-mvc" e:framework="mvc" type="xsd"/>
<artifact name="spring-tool" e:framework="tool" type="xsd"/>
<artifact name="spring-util" e:framework="util" type="xsd"/>
</dependency>
<dependency org="com.sun.java" name="schemas" rev="5" conf="schemas->default">
<artifact name="javaee_5" type="xsd"/>
<artifact name="web-app_2_5" type="xsd"/>
<artifact name="javaee_web_services_client_1_2" type="xsd"/>
<artifact name="jsp_2_1" type="xsd"/>
</dependency>
<dependency org="org.w3" name="schemas" rev="2001" conf="schemas->default">
<artifact name="XMLSchema" type="xsd"/>
<artifact name="xml" type="xsd"/>
</dependency>
</dependencies>
</ivy-module>
ivysettings.xml
Configure ivy to use Maven repositories by default. Use a modules declaration to route the special schema modules to your URL resolvers.
<ivysettings>
<settings defaultResolver="maven-repos"/>
<resolvers>
<chain name="maven-repos">
<ibiblio name="central" m2compatible="true"/>
..
Other Maven repositories go here
..
</chain>
<url name="spring-schemas">
<artifact pattern="http://www.springframework.org/schema/[framework]/[artifact].[ext]"/>
</url>
<url name="javaee-schemas">
<artifact pattern="http://java.sun.com/xml/ns/javaee/[artifact].[ext]"/>
</url>
<url name="w3-schemas">
<artifact pattern="http://www.w3.org/2001/[artifact].[ext]"/>
</url>
</resolvers>
<modules>
<module organisation="org.springframework" name="schemas" resolver="spring-schemas"/>
<module organisation="com.sun.java" name="schemas" resolver="javaee-schemas"/>
<module organisation="org.w3" name="schemas" resolver="w3-schemas"/>
</modules>
</ivysettings>