当Ivy文件大于10K后，执行jar包加载后会报如下错：impossible to resolve dependencies: java.io.IOException: Resetting to invalid mark。
删除一些注释后，文件小于10K，下载又正常了。
查找了官方网站说明，确认是一个BUG：https://issues.apache.org/jira/browse/IVY-1289。但后来一想，如果不升级版本，随着依赖的第三方JAR包增多怎么办呢？
于是想到了将ivy.xml拆成多个文件并修改ant脚本如下，经验证OK。
<!-- 下载或从本地缓存获取第三方包 -->
<target name="get-lib" depends="init,clean-lib-cache,configure-lib" description="下载或从本地缓存获取第三方包">
<ivy:resolve file="ivy.xml" conf="*" />
<ivy:retrieve pattern="${build.lib.dir}/[artifact].[ext]" />
<copy todir="${build.lib.dir}">
<fileset dir="${ext.lib}">
</fileset>
</copy>
</target>
修改为：
<!-- 下载或从本地缓存获取第三方包 -->
<target name="get-lib" depends="init,clean-lib-cache,configure-lib" description="下载或从本地缓存获取第三方包">
<ivy:resolve file="ivy-01.xml" conf="*" />
<ivy:retrieve pattern="${build.lib.dir}/[artifact].[ext]" />
<echo>********************************</echo>
<ivy:resolve file="ivy-02.xml" conf="*" />
<ivy:retrieve pattern="${build.lib.dir}/[artifact].[ext]" />
<copy todir="${build.lib.dir}">
<fileset dir="${ext.lib}">
</fileset>
</copy>
</target>
当然，除了这种方式，还可以将get-lib命令拆成两个命令，原get-lib命令依赖拆分后的这两个命令。如下所示：
<!-- =================================================================== -->
<!-- 下载或从本地缓存获取第三方包 -->
<!-- =================================================================== -->
<target name="get-lib" depends="get-lib1,get-lib2"/>
<target name="get-lib1" depends="init,clean-lib-cache,configure-lib" description="下载或从本地缓存获取第三方包">
<ivy:retrieve pattern="${build.lib.dir}/[artifact].[ext]" />
</target>
<target name="get-lib2" description="下载或从本地缓存获取第三方包">
<ivy:resolve file ="ivy2.xml" />
<ivy:retrieve pattern="${build.lib.dir}/[artifact].[ext]" />
</target>
Ivy与Ant集成学习资料：http://blog.csdn.net/lisonghua/article/details/4770260
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