Required extension "ant" not found.、Required extension "qdox" not found.、Require

2010-12-5 3:08:39 org.apache.catalina.core.AprLifecycleListener init
信息: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: D:\softwareInstall\JAVA\jdk1.5.0_11\bin;.;C:\WINDOWS\system32;C:\WINDOWS;D:\SOFTWA~1\jre6\bin;D:\softwareInstall\JAVA\jdk1.5.0_11\bin\..\jre\bin\client;D:\softwareInstall\JAVA\jdk1.5.0_11\bin\..\jre\bin;C:\Program Files\Common Files\NetSarang;D:\softwareInstall\oracle\product\10.2.0\db_1\bin;D:\softwareInstall\JAVA\jdk1.5.0_11\bin;D:\softwareInstall\grails\grails-1.3.3\bin;D:\softwareInstall\groovy\groovy-1.7.4\bin;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\Program Files\Common Files\Thunder Network\KanKan\Codecs;D:\installSoftware\svn\bin;D:\softwareInstall\database\MySQL\MySQL Server 5.1\bin;C:\Program Files\QuickTime\QTSystem\;C:\Program Files\Common Files\Ulead Systems\MPEG;D:\installSoftware\datebase\berkeleyDB\bin;D:\installSoftware\datebase\berkeleyDB\bin\debug
2010-12-5 3:08:39 org.apache.coyote.http11.Http11Protocol init
信息: Initializing Coyote HTTP/1.1 on http-20080
2010-12-5 3:08:39 org.apache.catalina.startup.Catalina load
信息: Initialization processed in 726 ms
2010-12-5 3:08:39 org.apache.catalina.core.StandardService start
信息: Starting service Catalina
2010-12-5 3:08:39 org.apache.catalina.core.StandardEngine start
信息: Starting Servlet Engine: Apache Tomcat/6.0.18
2010-12-5 3:08:39 org.apache.catalina.util.ExtensionValidator validateManifestResources
信息: ExtensionValidator[/book][commons-attributes-compiler.jar]: Required extension "ant" not found.
2010-12-5 3:08:39 org.apache.catalina.util.ExtensionValidator validateManifestResources
信息: ExtensionValidator[/book][commons-attributes-compiler.jar]: Required extension "qdox" not found.
2010-12-5 3:08:39 org.apache.catalina.util.ExtensionValidator validateManifestResources
信息: ExtensionValidator[/book][commons-attributes-compiler.jar]: Required extension "commons-attributes-api" not found.
2010-12-5 3:08:39 org.apache.catalina.util.ExtensionValidator validateManifestResources
信息: ExtensionValidator[/book][commons-attributes-compiler.jar]: Required extension "javadoc" not found.
2010-12-5 3:08:39 org.apache.catalina.util.ExtensionValidator validateManifestResources
信息: ExtensionValidator[/book]: Failure to find 4 required extension(s).
2010-12-5 3:08:39 org.apache.catalina.core.StandardContext start


这是因为commons-attributes-compiler.jar在工作的时候需要"ant"、"commons-attributes-api"、"javadoc"三个jar包支持，要么是你没提供，要么是提供的jar包版本有问题。

因为我的项目里commons-attributes-compiler.jar都没用上（是部署的时候Eclipse帮我加上的），我直接把"commons-attributes-compiler.jar"、"commons-attributes-api.jar"两个包从/WEB-INF/lib下面删掉就好了。
转载自：http://incan.iteye.com/blog/281461