Ivy 「multiple artifacts retrieved to same file」

錯誤現象：

工程依賴了common-cli包

  <dependency org="commons-cli" name="commons-cli" rev="1.0"/>

retrieve配置:

<ivy:retrieve pattern="${lib.dir}/[artifact].[ext]"/>

在publish的時候出現以下錯誤：

java.lang.RuntimeException: Multiple artifacts xxx are retrieved to the same file! Update the retrieve pattern  to fix this error.

解決方法：

修改retrieve pattern以下：

<ivy:retrieve pattern="${lib.dir}/[artifact].(-[classifier])[ext]"/>

the usual mistake is assuming that modules only publish library jars. If you're resolving a module like commons-lang that publishes other jars (source jars, javadoc jars, etc) then you need to incorporate the [classifier] token in your retrieve pattern. Here's an example: pattern="${lib.dir}/[conf]/[artifact](-[classifier]).[ext]"