我最近一个项目中需要用到xpath，引用的包文件包含xalan.jar。在jbuilder环境下可以顺利调试通过，然而放在tomcat和JRun中都不能运行（我以前做过其他的工程，不过没有用到xalan，一样的环境设置，因该没有什么问题），在JRun下的错误信息如下：
javax.servlet.ServletException: null
java.lang.NoSuchMethodError
at org.apache.xpath.axes.AxesWalker.getNextNode(AxesWalker.java:1051)
at org.apache.xpath.axes.AxesWalker.nextNode(AxesWalker.java:1137)
at
org.apache.xpath.axes.LocPathIterator.nextNode(LocPathIterator.java:689)
at org.apache.xpath.axes.LocPathIterator.runTo(LocPathIterator.java:755)
at
org.apache.xpath.axes.LocPathIterator.resetToCachedList(LocPathIterator.java
:426)
at
org.apache.xpath.axes.LocPathIterator.getLength(LocPathIterator.java:409)
at TestXPath.doPost(TestXPath.java:35)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:772)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:865)
at allaire.jrun.servlet.JRunSE.service(JRunSE.java:1013)
at allaire.jrun.servlet.JRunSE.runServlet(JRunSE.java:925)
at
allaire.jrun.servlet.JRunNamedDispatcher.forward(JRunNamedDispatcher.java:34
)
at allaire.jrun.servlet.Invoker.service(Invoker.java:84)
at allaire.jrun.servlet.JRunSE.service(JRunSE.java:1013)
at allaire.jrun.servlet.JRunSE.runServlet(JRunSE.java:925)
at
allaire.jrun.servlet.JRunRequestDispatcher.forward(JRunRequestDispatcher.jav
a:88)
at allaire.jrun.servlet.JRunSE.service(JRunSE.java:1131)
at allaire.jrun.servlet.JvmContext.dispatch(JvmContext.java:330)
at allaire.jrun.http.WebEndpoint.run(WebEndpoint.java:107)
at allaire.jrun.ThreadPool.run(ThreadPool.java:272)
at allaire.jrun.WorkerThread.run(WorkerThread.java:75)
它老是提示没有这个方法（getNextNode()）,请问，应该怎么解决呢？？不胜感激!