Need urgent help on Applet-Servlet communication

Hi,
I have a applet having two button A and B. A passes querystring "Select name from test where letter = A" when button A is pressed while B passes querystring "Select name from test where letter = B" when button B is pressed. The applet passes the string to a servlet which in turn queries a database to get the output name back to the applet. Both compiles fine but while running I am getting the following error:
java.io.IOException:
Any help is appreciated in advance. Thanks. Regards
THE APPLET CODE:
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;
public class ReinApplet1 extends Applet implements ActionListener
TextField text;
Button button1;
Button button2;
TextArea taResults;
String qryString1;
public void init()
button1 = new Button("A");
button1.addActionListener(this);
add(button1);
button2 = new Button("B");
button2.addActionListener(this);
add(button2);
taResults = new TextArea(2,30);
add(taResults);
// text = new TextField(20);
// add(text);
public void actionPerformed(ActionEvent e)
Object obj = e.getSource();
if(obj == button1)
String qryString = "select name from test where letter = A";
executeQuery (qryString);
if(obj == button2)
String qryString = "select name from test where letter = B";
executeQuery (qryString);
public void executeQuery (String query)
String qryString1 = query;
try
URL url=new URL("http://localhost:8080/examples/servlet/ReinServlet1");
String qry=URLEncoder.encode("qry") + "=" +
URLEncoder.encode(qryString1);
URLConnection uc=url.openConnection();
uc.setDoOutput(true);
uc.setDoInput(true);
uc.setUseCaches(false);
uc.setRequestProperty("Content-type",
"application/x-www-form-urlencoded");
DataOutputStream dos=new DataOutputStream(uc.getOutputStream());
dos.writeBytes(qry);
dos.flush();
dos.close();
InputStreamReader in=new InputStreamReader(uc.getInputStream());
int chr=in.read();
while(chr != -1)
taResults.append(String.valueOf((char) chr));
chr = in.read();
in.close();
// br.close();
catch(MalformedURLException e)
taResults.setText(e.toString());
catch(IOException e)
taResults.setText(e.toString());
THE SERVLET CODE:
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
import java.util.*;
import java.io.*;
public class ReinServlet1 extends HttpServlet
Connection dbCon;
public void init() throws ServletException
try
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
dbCon=DriverManager.getConnection("jdbc:odbc:Sales");
catch(Exception e)
System.out.println("Database Connection failed");
System.out.println(e.toString());
return;
public void handleHttpRequest(HttpServletRequest req,HttpServletResponse res) throws ServletException,IOException
PrintWriter out = res.getWriter();
res.setContentType("text/html");
String qery=req.getParameter("qry");
try
Statement st=dbCon.createStatement();
ResultSet rs= st.executeQuery(qery);
while(rs.next())
out.println(rs.getString(1));
catch(SQLException e)
System.out.println(e.toString());
return;
out.println();
out.close();
THE HTML CODE
<html>
<applet code = ReinApplet1.class width=500 height=300>
</applet>
</html>

Since you are just using Strings, it's easier to use an ObjectOutput/InputStream. See http://forum.java.sun.com/thread.jsp?forum=33&thread=205887 for a detailed example.
Cheers,
Anthony

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    I've also tried to catch a Throwable object in order to get information on the cause. But i get a "null" value (the docu says, that this will may be caused by an unknown error).
    I've also inspected the log files intensively. But they gave me no hint. Until now I've spend a lot of time on searching and messing around but i always get this classnotfound exception.
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    hi, thanks for the reply,
    all my classes are in the web-inf/classes of the web-app and have an appropriate package structure. thus the TestMessage class is inside a package.
    i tried some names for the testclass but it didn't matter. the exception stays the same. I also tried to put the jar in the common/lib but the problem stays.
    Well the problem with loaded classes: As i mentioned in the post above i can instantiate an object of TestMessage in the code without any problems (so the classloader of my webapp should know the class!!)
    only when reading from the objectinputstream the classloader doesn't seem to know the class?? maybe theres a parent classloader resposible for that and doesn't know the class?
    strange behaviour...
    p.s. sending the same object from the servlet to the client works well
    regards
    daniel
    Message was edited by:
    theazazel

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