faced error in jsp simple custom tag implemention

please anybody could find why my application giving ServletException
The following are the source files
index.html

<html>
<body>
<form method="GET" action="http://localhost:8888/cust5/druginfo.do">
<table border="1" align="center">
<tr>
<td><select id="drugs" multiple size="7" style="width: 100;">
<option value="B4112">B4112</option>
<option value="OMEZ">OMEZ</option>
<option value="BCOMPLEX">BCOMPLEX</option>
<option value="AVIL">AVIL</option>
<option value="COLDACT">COLDACT</option>
</select></td>
</tr>
<tr>
<td><input type="submit" name="submit" value="submit"></td>
</tr>
</table>
</form>
</body>
</html>

web.xml
<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
version="2.4">
<servlet>
<servlet-name>druginfo.do</servlet-name>
<servlet-class>HandlerServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>druginfo.do</servlet-name>
<url-pattern>/druginfo.do</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>/index.html</welcome-file>
</welcome-file-list>

<jsp-config>
<taglib>
<taglib-uri>http://thomson.pdi/tags</taglib-uri>
<taglib-location>/WEB-INF/simple.tld</taglib-location>
</taglib>
</jsp-config>

</web-app>

simple.tld
<?xml version="1.0" encoding="ISO-8859-1" ?>
<taglib xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd" version="2.0">

<tlib-version>1.0</tlib-version>
<jsp-version>1.2</jsp-version>
<uri>http://thomson.pdi/tags</uri>
<description>
Thomson custom tags
</description>
This is a dummy tag solely to satisfy DTD requirements
<tag>
<name>drugsinfo</name>
<tag-class>SimpleTagTest5</tag-class>
<body-content>scriptless</body-content>
<attribute>
<name>drugList</name>
<requried>true</requried>
<rtexprvalue>true</rtexprvalue>
</attribute>
</tag>
</taglib>

HandlerServlet.java

import java.io.IOException;
import java.rmi.ServerException;

import javax.servlet.RequestDispatcher;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class HandlerServlet extends HttpServlet {
public void doGet(HttpServletRequest req,HttpServletResponse res)throws IOException,ServerException{
res.setContentType("text/html");
String drugs[]=req.getParameterValues("drugs");
try{
req.setAttribute("durgs", drugs);
RequestDispatcher rd=req.getRequestDispatcher("/result.jsp");
rd.forward(req,res);
}catch(Exception e)
{
e.printStackTrace();
}
}
}

SimpleTagTest5.java

import java.io.IOException;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.SimpleTagSupport;

public class SimpleTagTest5 extends SimpleTagSupport{

private String[] drugList;

public void setDrugList(String[] drugList) {
this.drugList = drugList;
}
public void doTag()throws IOException,JspException{

for(String drug

rugList){
getJspContext().setAttribute("drug",drug);
getJspBody().invoke(null);
}
}
}

result.jsp

<%@ taglib uri="http://thomson.pdi/tags" prefix="s"%>
<table border="2">
<caption>Drugs Information</caption>
<s

rugsinfo drugList="${durgs}">
<tr>
<td>
${drug}
</td>
</tr>
</s

rugsinfo>
</table>

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