weblogic下的jsp页面内含有如下一行代码,出错?请高手指点!!!

Question

行号41:  List tabList=XPath.selectNodes(root,"//block[@type='tab']");org.jdom.JDOMException: java.lang.NoClassDefFoundError: org/jaxen/jdom/JDOMXPath
: org/jaxen/jdom/JDOMXPath
        at org.jdom.xpath.XPath.newInstance(XPath.java:139)
        at org.jdom.xpath.XPath.selectNodes(XPath.java:337)
        at com.huiton.cerp.frontend.Screen.genScript(Screen.java:41)
        at com.huiton.cerp.frontend.Screen.gen(Screen.java:82)
在\bea\user_projects\domains\mydomain\applications\DefaultWebApp\WEB-INF\lib下面已经包含这些包:jaxen-core.jar
jaxen-jdom.jar
jdom.jar
saxpath.jar
weblogic.jar
xalan.jar
xerces.jar
xml-apis.jar是不是我含缺包啊?请高手指点!