= pom.xmlが無視される =

Ivyでは多くの場合、依存をmaven2リポジトリ上から取得してくるが、そのpom.xmlはIvyの形式(ivy.xml)に自動変換されてivyキャッシュに格納される。例えば、プロジェクト中でguice-2.0への依存を宣言すると、ivyはmaven2リポジトリからそれを取得し、以「${user.home}/.ivy2/cache/com.google.inject/guice」に以下を作成する。

 * ivy-2.0.xml.original ... オリジナルのguiceのpom.xmlファイル
 * ivy-2.0.xml ... 上をivy.xmlに自動変換したもの。
 * jars ... guice-2.0のjarファイルを格納するフォルダ
 * ivydata-2.0.properties ... 今のところ用途不明

ivy-2.0.xmlは以下のようになる。
{{{
<?xml version="1.0" encoding="UTF-8"?>
<ivy-module version="2.0" xmlns:m="http://ant.apache.org/ivy/maven">
	<info organisation="com.google.inject"
		module="guice"
		revision="2.0"
		status="release"
		publication="20090801212549"
	>
		<description homepage="" />
		<m:dependency.management__com.google.inject__guice__version>2.0</m:dependency.management__com.google.inject__guice__version>
		<m:dependency.management__aopalliance__aopalliance__version>1.0</m:dependency.management__aopalliance__aopalliance__version>
	</info>
	<configurations>
		<conf name="default" visibility="public" description="runtime dependencies and master artifact can be used with this conf" extends="runtime,master"/>
		<conf name="master" visibility="public" description="contains only the artifact published by this module itself, with no transitive dependencies"/>
		<conf name="compile" visibility="public" description="this is the default scope, used if none is specified. Compile dependencies are available in all classpaths."/>
		<conf name="provided" visibility="public" description="this is much like compile, but indicates you expect the JDK or a container to provide it. It is only available on the compilation classpath, and is not transitive."/>
		<conf name="runtime" visibility="public" description="this scope indicates that the dependency is not required for compilation, but is for execution. It is in the runtime and test classpaths, but not the compile classpath." extends="compile"/>
		<conf name="test" visibility="private" description="this scope indicates that the dependency is not required for normal use of the application, and is only available for the test compilation and execution phases." extends="runtime"/>
		<conf name="system" visibility="public" description="this scope is similar to provided except that you have to provide the JAR which contains it explicitly. The artifact is always available and is not looked up in a repository."/>
		<conf name="sources" visibility="public" description="this configuration contains the source artifact of this module, if any."/>
		<conf name="javadoc" visibility="public" description="this configuration contains the javadoc artifact of this module, if any."/>
		<conf name="optional" visibility="public" description="contains all optional dependencies"/>
	</configurations>
	<publications>
		<artifact name="guice" type="jar" ext="jar" conf="master"/>
	</publications>
	<dependencies>
		<dependency org="aopalliance" name="aopalliance" rev="1.0" force="true" conf="compile->compile(*),master(*);runtime->runtime(*)"/>
		<override org="com.google.inject" module="guice" matcher="exact" rev="2.0"/>
		<override org="aopalliance" module="aopalliance" matcher="exact" rev="1.0"/>
	</dependencies>
</ivy-module>
}}}
このように、dependencies部分に正しくaopallianceへの依存が記述されている。
これがうまくいかない場合がある。アーティファクトのjarは取得できるものの、pom.xmlが取得できないため、ivyはこのアーティファクトについては勝手にデフォルトのivy.xmlを作成してしまい、そのアーティファクトの依存（現在のプロジェクトから見ると推移的依存）が抜け落ちてしまうことがある。
{{{
<?xml version="1.0" encoding="UTF-8"?>
<ivy-module version="2.0">
	<info organisation="xxxx"
		module="xxxx"
		revision="0.1.3"
		status="release"
		publication="20100922230141"
		default="true"
	/>
	<configurations>
		<conf name="default" visibility="public"/>
	</configurations>
	<publications>
		<artifact name="xxxx" type="jar" ext="jar" conf="default"/>
	</publications>
</ivy-module>
}}}

このケースはivysettings.xmlのリゾルバ指定の問題と思われる。このときの、ivyの出力を観察してみると
（[[ivy/IvyDE/console]]の訳注のやり方でチェック）、以下のような出力が見られる。

{{{
[ivy:resolve] loadData of clog#clog;0.1.3 of rootConf=compile
[ivy:resolve] 	using chainedResolvers to resolve clog#clog;0.1.3
[ivy:resolve] chainedResolvers: Checking cache for: dependency: clog#clog;0.1.3 {compile=[compile(*), master(*)], runtime=[runtime(*)]}
[ivy:resolve] 	no ivy file in cache for clog#clog;0.1.3: tried C:\Users\admin\.ivy2\cache\clog\clog\ivy-0.1.3.xml
[ivy:resolve] 	no ivy file in cache for clog#clog;0.1.3: tried C:\Users\admin\.ivy2\cache\clog\clog\ivy-0.1.3.xml
[ivy:resolve] 	 trying file:C:\Users\admin/.m2/repository/clog/clog/0.1.3/clog-0.1.3.pom
[ivy:resolve] 		tried file:C:\Users\admin/.m2/repository/clog/clog/0.1.3/clog-0.1.3.pom
[ivy:resolve] 	local: resource not reachable for clog#clog;0.1.3: res=file:C:/Users/admin/.m2/repository/clog/clog/0.1.3/clog-0.1.3.pom
[ivy:resolve] 	 trying file:C:\Users\admin/.m2/repository/clog/clog/0.1.3/clog-0.1.3.jar
[ivy:resolve] 		tried file:C:\Users\admin/.m2/repository/clog/clog/0.1.3/clog-0.1.3.jar
[ivy:resolve] 	local: resource not reachable for clog#clog;0.1.3: res=file:C:/Users/admin/.m2/repository/clog/clog/0.1.3/clog-0.1.3.jar
[ivy:resolve] 	local: no ivy file nor artifact found for clog#clog;0.1.3
[ivy:resolve] 	no ivy file in cache for clog#clog;0.1.3: tried C:\Users\admin\.ivy2\cache\clog\clog\ivy-0.1.3.xml
[ivy:resolve] 	 trying http://repo1.maven.org/maven2/clog/clog/0.1.3/clog-0.1.3.pom
[ivy:resolve] 		tried http://repo1.maven.org/maven2/clog/clog/0.1.3/clog-0.1.3.pom
[ivy:resolve] HTTP response status: 404 url=http://repo1.maven.org/maven2/clog/clog/0.1.3/clog-0.1.3.pom
[ivy:resolve] CLIENT ERROR: Not Found url=http://repo1.maven.org/maven2/clog/clog/0.1.3/clog-0.1.3.pom
[ivy:resolve] 	ibiblio: resource not reachable for clog#clog;0.1.3: res=http://repo1.maven.org/maven2/clog/clog/0.1.3/clog-0.1.3.pom
[ivy:resolve] 	 trying http://repo1.maven.org/maven2/clog/clog/0.1.3/clog-0.1.3.jar
[ivy:resolve] 		tried http://repo1.maven.org/maven2/clog/clog/0.1.3/clog-0.1.3.jar
[ivy:resolve] HTTP response status: 404 url=http://repo1.maven.org/maven2/clog/clog/0.1.3/clog-0.1.3.jar
[ivy:resolve] CLIENT ERROR: Not Found url=http://repo1.maven.org/maven2/clog/clog/0.1.3/clog-0.1.3.jar
[ivy:resolve] 	ibiblio: resource not reachable for clog#clog;0.1.3: res=http://repo1.maven.org/maven2/clog/clog/0.1.3/clog-0.1.3.jar
[ivy:resolve] 	ibiblio: no ivy file nor artifact found for clog#clog;0.1.3
[ivy:resolve] 	no ivy file in cache for clog#clog;0.1.3: tried C:\Users\admin\.ivy2\cache\clog\clog\ivy-0.1.3.xml
[ivy:resolve] 	 trying http://10.8.0.1:8001/maven2/clog/clog/0.1.3/clog-0.1.3.jar
[ivy:resolve] 		tried http://10.8.0.1:8001/maven2/clog/clog/0.1.3/clog-0.1.3.jar
[ivy:resolve] 	internal: no ivy file found for clog#clog;0.1.3: using default data
}}}

最後の「no ivy file found for clog#clog;0.1.3: using default data」がこの状態を示している。