I think the default behaviour of ivy:retrieve in Ant should be the same as the retrieve from CLI, could you please create a JIRA issue for this?

Maarten



----- Original Message ----
From: Tom Widmer <tom.widmer@gmail.com>
To: ivy-user@ant.apache.org
Sent: Thursday, April 16, 2009 1:42:57 AM
Subject: Re: Exception When Directly Executing The Ivy JAR.

Georges Labrèche wrote:
> Hello,
> I'm having issues when running ivy retrieve upon directly executing the JAR instead of using the ivy:retrieve task in Ant.
> The reason I am doing this is because I am using NAnt and the exec task instead of Ant and Ivy tasks.
> For instance, the build.xml Ant script of the hello-ivy example implements the following "resolve" target:
> <target name="resolve" description="--> retrieve dependencies with ivy">
>         <ivy:retrieve/>
> </target>
> This works perfectly.

Or possibly fails silently...

> Porting this to a NAnt script would result in the following "resolve" target:
> <property name="ivy.jar" value="tools\ivy\ivy.jar"/>
> <target name="resolve" description="--> retrieve dependencies with ivy">
>         <exec program="java" commandline="-jar ${ivy.jar} -retrieve ivy.xml"/>
> </target> Executing this task throws the following exception:
> -----------------------------------------------------------------------
>      [exec] Exception in thread "main" java.lang.RuntimeException: problem durin
> g retrieve of Stream57#Cortex: java.lang.RuntimeException: Multiple artifacts of
>  the module commons-cli#commons-cli;1.0 are retrieved to the same file! Update t
> he retrieve pattern  to fix this error.
>      [exec] :: retrieving :: Stream57#Cortex
>      [exec]  confs: [default]
>      [exec]  at org.apache.ivy.core.retrieve.RetrieveEngine.retrieve(RetrieveEng
> ine.java:196)
>      [exec]  at org.apache.ivy.Ivy.retrieve(Ivy.java:540)
>      [exec]  at org.apache.ivy.Main.run(Main.java:268)
>      [exec]  at org.apache.ivy.Main.main(Main.java:168)
>      [exec] Caused by: java.lang.RuntimeException: Multiple artifacts of the mod
> ule commons-cli#commons-cli;1.0 are retrieved to the same file! Update the retri
> eve pattern  to fix this error.
>      [exec]  at org.apache.ivy.core.retrieve.RetrieveEngine.determineArtifactsTo
> Copy(RetrieveEngine.java:349)
>      [exec]  at org.apache.ivy.core.retrieve.RetrieveEngine.retrieve(RetrieveEng
> ine.java:102)
>      [exec]  ... 3 more
> 
> The error message suggests to "update the retrieve pattern  to fix this error." So I have also tried the following:
> <exec program="java" commandline="-jar ${ivy.jar} -retrieve ${lib.dir}/[artifact].[ext]"/>
> But the same exception is thrown.
> Any ideas?

I think it's a real error, since commons-cli (in common with many maven generated libraries) probably has multiple artifacts with the same name (lib, sources and javadoc). Try something like
<exec program="java" commandline="-jar ${ivy.jar} -retrieve ${lib.dir}/[artifact]-[type].[ext]"/>

or, better, update your ivy.xml file so you only depend on the default conf of maven artifacts, and not *.

Tom