Retrieve Specific jar to a Folder - ivy

Question

I was to retrieve a jar from ivy cache to a lib folder, below is the ivy.xml code:
<configurations>
<conf name="specificFolder" description="add jar to web-inf/lib folder"/>
</configurations>
<dependencies>
<dependency org="javax.servlet" name="servlet-api" rev="2.4" transitive="false" conf="specificFolder"/>
<dependency org="org.springframework" name="spring-beans" rev="2.5.5" transitive="false" />
<dependency org="org.springframework" name="spring-webmvc" rev="2.5.5" transitive="false" />
<dependency org="org.springframework" name="spring-web" rev="2.5.5" transitive="false" />
<dependency org="org.springframework" name="spring-context" rev="2.5.5" transitive="false" />
<dependency org="org.springframework" name="spring" rev="1.2.6" transitive="false" />
then this is ant target:
<target name="test">
<ivy:retrieve pattern="lib/[artifact](.[ext])" sync="true" type="jar" conf="specificFolder"/>
</target>
But I got "Unresolved Dependency", this anything I am doing wrong?

Answer 1

I reproduced your problem and here is the relevant error message:
[ivy:resolve] ::::::::::::::::::::::::::::::::::::::::::::::
[ivy:resolve] :: UNRESOLVED DEPENDENCIES ::
[ivy:resolve] ::::::::::::::::::::::::::::::::::::::::::::::
[ivy:resolve] :: javax.servlet#servlet-api;2.4: configuration not found in javax.servlet#servlet-api;2.4: 'specificFolder'. It was required from com.myspotontheweb#demo;????? specificFolder
[ivy:resolve] ::::::::::::::::::::::::::::::::::::::::::::::
The root cause is the following dependency declaration:
<dependency org="javax.servlet" name="servlet-api" ... conf="specificFolder"/>
While the configuration exists in your module it does not exist in the remote Maven module. For more details on how see the following answer:
How are maven scopes mapped to ivy configurations by ivy
Working example
ivy.xml
<ivy-module version="2.0">
<info organisation="com.myspotontheweb" module="demo"/>
<configurations>
<conf name="specificFolder" description="add jar to web-inf/lib folder"/>
</configurations>
<dependencies>
<dependency org="javax.servlet" name="servlet-api" rev="2.4" conf="specificFolder->master"/>
<dependency org="org.springframework" name="spring-beans" rev="2.5.5" conf="specificFolder->master"/>
<dependency org="org.springframework" name="spring-webmvc" rev="2.5.5" conf="specificFolder->master"/>
<dependency org="org.springframework" name="spring-web" rev="2.5.5" conf="specificFolder->master"/>
<dependency org="org.springframework" name="spring-context" rev="2.5.5" conf="specificFolder->master"/>
<dependency org="org.springframework" name="spring" rev="1.2.6" conf="specificFolder->master"/>
</dependencies>
</ivy-module>
Notes:
This example uses configuration mappings instead of "transitive=false". The local configuration is "specificFolder" and the remote configuration is the special "master". "master" is provided by Maven modules and means the remote artifact with no dependencies. I think this approach is simpler once it's understood how configurations work. (Very powerful concept in Maven)
what does the little arrow -> do in the ivy dependency section?