Hi,
here are my files:

index.html
--------



CustomerServlet





Login : <INPUT TYPE=text NAME=LoginID>
Password : <INPUT TYPE=password NAME=Password>


press Submit to post to servlet CustomerServlet





----------------

servlet: CustomerServletClass.java
------
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.sql.*;
import java.util.*;


public class CustomerServletClass extends HttpServlet {
static final private String CONTENT_TYPE = "text/html";
private Connection connection=null;
private Statement statement=null;
StringBuffer logBuffer = new StringBuffer();

//Initialize global variables

public void init() throws ServletException {
try {
// SQLException, ClassNotFoundException, InstantiationException
// Load the MM JDBC driver
// The newInstance() call is a work around for some
// broken Java implementations
// Class.forName("org.gjt.mm.mysql.Driver").newInstance();

Class.forName("com.mysql.jdbc.Driver");

// since we don't want our database account and password to
// appear in the program listing, we read it from a private file
// students should create their own .mysql-init in their top-
// level directory.

/* String account="**";
String password="**";
try {
BufferedReader in = new BufferedReader(new InputStreamReader(
new FileInputStream("/usr/faculty/schmitt/.mysql-init")));
account=in.readLine();
password=in.readLine();
}
catch (Exception e) {
System.out.println("StocksMy: cannot read .mysql-init");
System.exit(1);
}
*/

// Once the driver is registered, a Connection can be established.
// Obtaining a Connection requires a URL for the database.
// This URL is constructed using the following syntax, where items
// contained in sqaure brackets are optional:
// jdbc:mysql://[hostname][:port]/dbname[?param1=value1][=value2]...
// Create a Connection and a Statement

connection=DriverManager.getConnection
// ("jdbc:mysql://proserv:3306/ASIDb?user=huy&password=papi74");
("jdbc:mysql://proserv:3306/ASIDb", "huy", "papi74");
}
catch (Exception e) {
System.out.println("JDBC exception");
System.exit(1);
}
}

//Process the HTTP Get request

public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType(CONTENT_TYPE);
PrintWriter out = response.getWriter();
out.println("");
out.println("CustomerServlet");
out.println("");
out.println("The servlet has received a GET. This is the reply.");
out.println("");
}

//Process the HTTP Post request

public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String LoginID, Password;

LoginID=request.getParameter("LoginID");
Password=request.getParameter("Password");

response.setContentType(CONTENT_TYPE);
PrintWriter out = response.getWriter();

if(LoginID.equals("") || Password.equals("")){
out.println("<H3> Please click the back button and fill in all fields. </H3>");
out.close();
return;
}

boolean success=checkPassword(LoginID,Password);

if (success){
out.println("");
out.println("CustomerServlet");
out.println("");
out.println("The password is good.");
out.println("\n<H3>Error log this session:</H3>\n");
out.println(logBuffer.toString());
out.println("");
out.println("");
}
else{
out.println("");
out.println("CustomerServlet");
out.println("");
out.println("An error occurred or bad password. Please try again later.");
out.println("\n<H3>Error log this session:</H3>\n");
out.println(logBuffer.toString());
out.println("");
out.println("");
}
}

public boolean checkPassword(String LoginID, String Password) {
ResultSet rs=null;

try {
statement=connection.createStatement();
String query = "SELECT LoginID, Password FROM tbLogin";
log("query = " + query);
rs = statement.executeQuery(query);

boolean IDFound=false;
String s,p = null;
rs.first();

do {
s = rs.getString("LoginID");
p = rs.getString("Password");

if (s.equals(LoginID)){
IDFound=true;
break;
}
}
while (rs.next());

if (IDFound){
if (p.equals(Password)){
return true;
}
}
else
return false;

statement.close();
rs.close();
}
catch (Exception e) {
System.err.println("Error checking password");
e.printStackTrace();
return false;
}
return true;
}

public void log(String s) {
s = new java.util.Date().toString() + ": " + s;
System.err.println(s);
logBuffer.append(s);
logBuffer.append("\n");
super.log(s);
}

//Clean up resources

public void destroy() {
try {
connection.close();
}
catch(Exception e){
System.err.println("Problem closing the database");
}
}
}
----------------
web.xml:
------
<?xml version="1.0" encoding="ISO-8859-1"?>

<!DOCTYPE web-app PUBLIC
'-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN'
'http://java.sun.com/j2ee/dtds/web-app_2_3.dtd'>

<web-app>


<servlet-name>CustomerServletClass</servlet-name>
<display-name>CustomerServletClass</display-name>
<servlet-class>CustomerServletClass</servlet-class>

<servlet-mapping>
<servlet-name>CustomerServletClass</servlet-name>
<url-pattern>/CustomerModuleServletApp</url-pattern>
</servlet-mapping>
<session-config>
<session-timeout>30</session-timeout>
</session-config>
</web-app>

-----

I packed with jar cvf test.war
and after I deployed...
I can get to index.html
and after I submit JBoss 3.2.0 crashed.... do you guys know why? I tried with J2EE, it works fine...
thanks