我有一段代码，使用dom4j 正则表达式解析gml ， 代码如下：
list<element> featuremembers= root.selectnodes("featuremember");
发生以下异常：
java.lang.noclassdeffounderror: org/jaxen/jaxenexception
at org.dom4j.documentfactory.createxpath(documentfactory.java:230)
at org.dom4j.tree.abstractnode.createxpath(abstractnode.java:207)
at org.dom4j.tree.abstractnode.selectnodes(abstractnode.java:164)
at com.geoway.spatial.util.locationutils.parsetdtresponsedocument(locationutils.java:56)
at com.geoway.spatial.util.locationutils.querytdtwfs(locationutils.java:33)
at com.geoway.spatial.service.impl.tdtlocationserviceimpl.getlocationbyname(tdtlocationserviceimpl.java:28)
at com.geoway.spatial.service.impl.locationadapter.getlocationbyname(locationadapter.java:31)
at com.geoway.spatial.service.impl.locationadapter.test(locationadapter.java:48)
at sun.reflect.nativemethodaccessorimpl.invoke0(native method)
at sun.reflect.nativemethodaccessorimpl.invoke(nativemethodaccessorimpl.java:39)
at sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java:25)
at java.lang.reflect.method.invoke(method.java:597)
at org.springframework.beans.factory.annotation.initdestroyannotationbeanpostprocessor$lifecycleelement.invoke(initdestroyannotationbeanpostprocessor.java:297)
at org.springframework.beans.factory.annotation.initdestroyannotationbeanpostprocessor$lifecyclemetadata.invokeinitmethods(initdestroyannotationbeanpostprocessor.java:250)
at org.springframework.beans.factory.annotation.initdestroyannotationbeanpostprocessor.postprocessbeforeinitialization(initdestroyannotationbeanpostprocessor.java:144)
at org.springframework.beans.factory.support.abstractautowirecapablebeanfactory.applybeanpostprocessorsbeforeinitialization(abstractautowirecapablebeanfactory.java:350)
at org.springframework.beans.factory.support.abstractautowirecapablebeanfactory.initializebean(abstractautowirecapablebeanfactory.java:1329)
at org.springframework.beans.factory.support.abstractautowirecapablebeanfactory.docreatebean(abstractautowirecapablebeanfactory.java:471)
at org.springframework.beans.factory.support.abstractautowirecapablebeanfactory$1.run(abstractautowirecapablebeanfactory.java:409)
at java.security.accesscontroller.doprivileged(native method)
at org.springframework.beans.factory.support.abstractautowirecapablebeanfactory.createbean(abstractautowirecapablebeanfactory.java:380)
at org.springframework.beans.factory.support.abstractbeanfactory$1.getobject(abstractbeanfactory.java:264)
at org.springframework.beans.factory.support.defaultsingletonbeanregistry.getsingleton(defaultsingletonbeanregistry.java:217)
at org.springframework.beans.factory.support.abstractbeanfactory.dogetbean(abstractbeanfactory.java:261)
at org.springframework.beans.factory.support.abstractbeanfactory.getbean(abstractbeanfactory.java:185)
at org.springframework.beans.factory.support.abstractbeanfactory.getbean(abstractbeanfactory.java:164)
at org.springframework.beans.factory.support.defaultlistablebeanfactory.preinstantiatesingletons(defaultlistablebeanfactory.java:429)
at org.springframework.context.support.abstractapplicationcontext.finishbeanfactoryinitialization(abstractapplicationcontext.java:729)
at org.springframework.context.support.abstractapplicationcontext.refresh(abstractapplicationcontext.java:381)
at org.springframework.web.context.contextloader.createwebapplicationcontext(contextloader.java:255)
at org.springframework.web.context.contextloader.initwebapplicationcontext(contextloader.java:199)
at org.springframework.web.context.contextloaderlistener.contextinitialized(contextloaderlistener.java:45)
at org.apache.catalina.core.standardcontext.listenerstart(standardcontext.java:3934)
at org.apache.catalina.core.standardcontext.start(standardcontext.java:4429)
at org.apache.catalina.core.containerbase.addchildinternal(containerbase.java:791)
at org.apache.catalina.core.containerbase.addchild(containerbase.java:771)
at org.apache.catalina.core.standardhost.addchild(standardhost.java:526)
at org.apache.catalina.startup.hostconfig.deploydirectory(hostconfig.java:987)
at org.apache.catalina.startup.hostconfig.deploydirectories(hostconfig.java:909)
at org.apache.catalina.startup.hostconfig.deployapps(hostconfig.java:495)
at org.apache.catalina.startup.hostconfig.start(hostconfig.java:1206)
at org.apache.catalina.startup.hostconfig.lifecycleevent(hostconfig.java:314)
at org.apache.catalina.util.lifecyclesupport.firelifecycleevent(lifecyclesupport.java:119)
at org.apache.catalina.core.containerbase.start(containerbase.java:1053)
at org.apache.catalina.core.standardhost.start(standardhost.java:722)
at org.apache.catalina.core.containerbase.start(containerbase.java:1045)
at org.apache.catalina.core.standardengine.start(standardengine.java:443)
at org.apache.catalina.core.standardservice.start(standardservice.java:516)
at org.apache.catalina.core.standardserver.start(standardserver.java:710)
at org.apache.catalina.startup.catalina.start(catalina.java:583)
at sun.reflect.nativemethodaccessorimpl.invoke0(native method)
at sun.reflect.nativemethodaccessorimpl.invoke(nativemethodaccessorimpl.java:39)
at sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java:25)
at java.lang.reflect.method.invoke(method.java:597)
at org.apache.catalina.startup.bootstrap.start(bootstrap.java:288)
at org.apache.catalina.startup.bootstrap.main(bootstrap.java:413)
caused by: java.lang.classnotfoundexception: org.jaxen.jaxenexception
at org.apache.catalina.loader.webappclassloader.loadclass(webappclassloader.java:1387)
at org.apache.catalina.loader.webappclassloader.loadclass(webappclassloader.java:1233)
at java.lang.classloader.loadclassinternal(classloader.java:320)
... 56 more
根据异常，发现少了一个类：org.jaxen.jaxenexception 这个类存在jaxen.jar包中，原因可想而知了！在路径下加入这个jar包即可。
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