Can't Download json-lib in Ivy - ivy

Question

I want to download json-lib-2.3-jdk15.jar. I find ivy don't have classifier tag, so I use maven one, below is the ivy.xml
<ivy-module version="2.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="http://ant.apache.org/ivy/schemas/ivy.xsd"
xmlns:m="http://ant.apache.org/ivy/maven">
<info organisation="xxxx" module="xxx" status="integration"/>
<dependencies>
<dependency org="net.sf.json-lib" name="json-lib" rev="2.3">
<artifact name="json-lib" type="jar" m:classifier="jdk15"/>
</dependency>
</dependencies>
</ivy-module>
And ivysetting.xml
<ivysettings>
<settings defaultResolver="default" />
<include url="${ivy.default.settings.dir}/ivysettings-public.xml" />
<include url="${ivy.default.settings.dir}/ivysettings-shared.xml"/>
<include url="${ivy.default.settings.dir}/ivysettings-local.xml" />
<include url="${ivy.default.settings.dir}/ivysettings-main-chain.xml"/>
<caches artifactPattern="[organisation]/[module]/([branch]/)[type]s/([platform]/)[artifact]-[revision](.[ext])" />
<resolvers>
<filesystem name="local">
<ivy
pattern="${ivy.local.default.root}/[organisation]/[module]/([branch]/)[revision]/ivy.xml" />
<artifact
pattern="${ivy.local.default.root}/[organisation]/[module]/([branch]/)[revision]/[type]s/([platform]/)[artifact](.[ext])" />
</filesystem>
<ibiblio name="public" m2compatible="true" usepoms="true" pattern="[organisation]/[module]/[revision]/[artifact]-[revision](-[classifier]).[ext]" />
<chain name="default" returnFirst="true">
<resolver ref="local" />
<resolver ref="public"/>
</chain>
</resolvers>
</ivysettings>
But I still can't download it. It seems like m:classifier not work. Any suggestion about this? Thanks.
I finally find the root reason. I should not use
xmlns:m="http://ant.apache.org/ivy/maven
I should use
xmlns:m="http://ant.apache.org/ivy/extra
Another thing, in my case, I was add "conf" distribute in "artifact" tag, which will make the jar download fail. So do not add "conf" in "artifact".

Answer 1

Works for me.... What version of ivy are you using?
The following example contains some suggested enhancements
Example
Apache Ant(TM) version 1.8.2
Apache Ivy 2.3.0-rc2
ivy.xml
<ivy-module version="2.0" xmlns:m="http://ant.apache.org/ivy/maven">
<info organisation="xxxx" module="xxx"/>
<configurations>
<conf name="jdk15" description="JDK 1.5 dependencies"/>
</configurations>
<dependencies>
<dependency org="net.sf.json-lib" name="json-lib" rev="2.3" conf="jdk15->master">
<artifact name="json-lib" type="jar" m:classifier="jdk15"/>
</dependency>
</dependencies>
</ivy-module>
Notes:
It's always a good idea to use configurations. In this case I've created one called "jdk15" to group the files with jdk15 classifiers
The remote "master" configuration is special and contains no transitive dependencies (See following link for explanation)
How are maven scopes mapped to ivy configurations by ivy
ivysettings.xml
<ivysettings>
<settings defaultResolver="central" />
<resolvers>
<ibiblio name="central" m2compatible="true"/>
</resolvers>
</ivysettings>
Notes:
This is a minimal ivy settings file. (In fact you could omit the file and it would be functionally the same).
Are you using the "local" resolver? In my experience it's unnecessary (Unless you're publishing artifacts during your build)