我有一个WEB工程需要用到commons-collections和commons-dbcp.
代码中用到的是commons-collections的3.1版本特性，但是资源库中commons-dbcp依赖的
commons-collections指定了2.1版本。看了下commons-dbcp-1.2.1.pom：
commons-collections
commons-collections
2.1
当我将web工程打包时，maven会将commons-collections-3.1.jar
和commons-collections-2.1.jar都拷贝进WAR包。 如何只让maven只将
commons-collections-3.1.jar拷贝到war包中去？
[b]问题补充：[/b]
谢谢，jansel的答复，方案1是可以行的，但是觉得maven应该有其它解决方案，所以发贴出来咨询一下。方案2我试过了，在我自己的工程pom.xml文件中指定了
高版本的common-collections，但是maven做package的时候依赖会将两个版本的common-collections库都打进WEB-INF/lib，我的maven版本是2.0.9.
[b]问题补充：[/b]
E:\NGWORK\javaprj\webapp>mvn dependency:tree -Dverbose -Dincludes=commons-collections
E:\NGWORK\javaprj\webapp>set MAVEN_OPTS=-Xms64m -Xmx512m
[INFO] Scanning for projects...
[INFO] Searching repository for plugin with prefix: 'dependency'.
[INFO] ------------------------------------------------------------------------
[INFO] Building Unnamed - asiainfo.cboss:cboss:war:SNAPSHOT
[INFO] task-segment: [dependency:tree]
[INFO] ------------------------------------------------------------------------
Downloading: http://repo1.maven.org/maven2/asiainfo/cas/aicasclient/1.0/aicasclient-1.0.pom
Downloading: http://repo1.maven.org/maven2/cmcc/twcmcc/1.4/twcmcc-1.4.pom
Downloading: http://repo1.maven.org/maven2/castor/castor-xml/1.0/castor-xml-1.0.pom
Downloading: http://repo1.maven.org/maven2/asiainfo/openboss/openclient/2.0/openclient-2.0.pom
Downloading: http://repo1.maven.org/maven2/xstream/xstream/1.3/xstream-1.3.pom
Downloading: http://repo1.maven.org/maven2/jdk/tools/1.4.2/tools-1.4.2.pom
Downloading: http://repo1.maven.org/maven2/servlet/servlet/2.3/servlet-2.3.pom
Downloading: http://repo1.maven.org/maven2/asiainfo/cboss/portalExternal/1.8/portalExternal-1.8.pom
Downloading: http://repo1.maven.org/maven2/asiainfo/openbuff/EzfrmWeb/1.0/EzfrmWeb-1.0.pom
Downloading: http://repo1.maven.org/maven2/asiainfo/openbuff/EzfrmBiz/1.0/EzfrmBiz-1.0.pom
Downloading: http://repo1.maven.org/maven2/net/sf/jasperreports/2.0.3/jasperreports-2.0.3.pom
Downloading: http://repo1.maven.org/maven2/lowagie/itext/1.3.1/itext-1.3.1.pom
Downloading: http://repo1.maven.org/maven2/lowagie/itext-asian/1.0/itext-asian-1.0.pom
Downloading: http://repo1.maven.org/maven2/net/sf/json/2.2.1/json-2.2.1.pom
Downloading: http://repo1.maven.org/maven2/net/sf/ezmorph/1.0.4/ezmorph-1.0.4.pom
Downloading: http://repo1.maven.org/maven2/edu/concurrent/1.0/concurrent-1.0.pom
Downloading: http://repo1.maven.org/maven2/asiainfo/ny/nysecurity/1.0/nysecurity-1.0.pom
Downloading: http://repo1.maven.org/maven2/cmcc/trustwork/1.4/trustwork-1.4.pom
Downloading: http://repo1.maven.org/maven2/cmcc/pwdSvr/1.4/pwdSvr-1.4.pom
Downloading: http://repo1.maven.org/maven2/poi/poi/2.5.1-FINAL/poi-2.5.1-FINAL.pom
[INFO] [dependency:tree]
[INFO] asiainfo.cboss:cboss:war:SNAPSHOT
[INFO] +- asiainfo.cboss:cboss-common:jar:SNAPSHOT:compile
[INFO] | - org.apache.velocity:velocity:jar:1.5:compile
[INFO] | - (commons-collections:commons-collections:jar:3.1:compile - omitted for conflict with 2.1)
[INFO] +- commons-collections:commons-collections:jar:3.1:runtime (scope not updated to compile)
[INFO] +- commons-dbcp:commons-dbcp:jar:1.2.1:compile
[INFO] | - (commons-collections:commons-collections:jar:2.1:compile - omitted for conflict with 3.1)
[INFO] +- commons-beanutils:commons-beanutils:jar:1.6:compile
[INFO] | - (commons-collections:commons-collections:jar:2.0:compile - omitted for conflict with 3.1)
[INFO] - commons-pool:commons-pool:jar:1.2:compile
[INFO] - (commons-collections:commons-collections:jar:2.1:compile - omitted for conflict with 3.1)
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESSFUL
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 33 seconds
[INFO] Finished at: Wed Sep 09 13:18:59 CST 2009
[INFO] Final Memory: 13M/63M
[b]问题补充：[/b]
的确是按最短路径实现的，我在自己的pom.xml中指定了使用版本，maven就是使用这个版本的。 上午是因为忘记做clean了，所以原来已经拷贝到WEB-INF/lib目录的库没有被清理这样commons-collections－2.1.jar还是会存在， 让我误认为不能生效。
