Why a method can not be invoked in JSP ???

Question

I define a method in a JAVA Class file,as this:
public Enumeration getElementsNamed(String name, String parentname) {
Element elem = doc.getDocumentElement();
NodeList nodes = elem.getElementsByTagName(name);
int size = nodes.getLength();
Vector elemVec = new Vector(size);
for (int i = 0; i < size; i++) {
Node node = nodes.item(i);
     if (nodes     .item(i).getParentNode().getLocalName().equals(parentname)) {
          elemVec.addElement(new UddiObject((Element) node));
          return elemVec.elements();
I want to get a Element who's Localname is the name and his parent Element's laocalname is the parentname from a DOM tree.
This can be run well in a normal Java environment just as JDK1.4.
and is a JSP file,I import the Class first.
and invkoed the method in somewhere, the TOMCAT give me an error:
The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException     
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:254)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:295)
the JSP file is :
<%@ page import="java.util.*,org.w3c.dom.*, edu.hunnu.uddi.*, java.sql.*,java.io.*,edu.hunnu.uddiserver.util.*,edu.hunnu.uddiserver.inquiry.*" %>
<h1>Get tModel</h1>
<%
     Connection con = SqlConnection.getConnection();
String Description="";
     String detail ="<get_tModelDetail generic=\"2.0\" xmlns=\"urn:uddi-org:api_v2\"><tModelKey>"+tModelKey+"</tModelKey></get_tModelDetail>";
     ByteArrayInputStream bas = new ByteArrayInputStream(detail.getBytes());
     TModelDetails tmodelDetails = new TModelDetails( new Get_TModelDetail(bas), con);
UddiObject obj=tmodelDetails.getData();
     obj=obj.getElement(UddiTags.TMODEL);
     Description=Description+((TModel)obj).getDescription();
     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          Error at this
          %>
<%%>
WHY??? and HOW????

Answer 1

oh~It is my mistake.
and the JSP file would be:
<%@ page import="java.util.*,org.w3c.dom.*, edu.hunnu.uddi.*, java.sql.*,java.io.*,edu.hunnu.uddiserver.util.*,edu.hunnu.uddiserver.inquiry.*" %>
<h1>Get tModel</h1>
<%
     Connection con = SqlConnection.getConnection();
String Description="";
     String detail ="<get_tModelDetail generic=\"2.0\" xmlns=\"urn:uddi-org:api_v2\"><tModelKey>"+tModelKey+"</tModelKey></get_tModelDetail>";
     ByteArrayInputStream bas = new ByteArrayInputStream(detail.getBytes());
     TModelDetails tmodelDetails = new TModelDetails( new Get_TModelDetail(bas), con);
UddiObject obj=tmodelDetails.getData();
     obj=obj.getElement(UddiTags.TMODEL);
     Enumeration enum=obj.getElementsNamed("description","tModel");
     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          Error at this
          %>
and the variable "obj" :
<tModel operator="www.hunnu.edu.cn"tModelKey="uuid:50C693A0-7AB8-11D5-93A0-CFE2D4CCB519"><name>simple.services</name><description>This is a basic tModel for service providers and consultant</description><overviewDoc><overviewURL>http://www.hunnu.edu.cn</overviewURL><description>Service documentation can be obtainedfrom the URL provided</description></overviewDoc><identifierBag/><categoryBag/></tModel>