Why this stand alone app cannot communicate with servlet

[arun mahajan]

Hello,
I was trying to communicate from a stand alone application to servlet through URL connections. but while retrieving back the information it gives me error that Stream is not seralized.
where i am wrong? pl help.
regards,
Arun

package test;
import java.net.*;
import java.io.*;
public class check
{
String recv="";
public check(String val)
{
recv=val;
}
public String read()
{
URL url=null;
URLConnection uc=null;
boolean urlflag= false;
boolean sendval = false;
System.out.println("this is set out");
try
{
url = new URL("http://192.168.100.78:8100/servlet/test.scheck");
uc =  url.openConnection();
uc.setDoInput(true);
uc.setDoOutput(true);
urlflag=true;
}
catch(Exception e)
{
urlflag=false;
System.out.println("Exception:"+e);
}
if(urlflag)
{
//sending data
try
{
ObjectOutputStream oos = new ObjectOutputStream(uc.getOutputStream());
String toSend = new String(recv);
oos.writeObject((Object)toSend);
oos.flush();
sendval =true;
}
catch(Exception e)
{
sendval=false;
System.out.println("Exception:"+e);
}
if(sendval)
{
try
{
ObjectInputStream ois = new ObjectInputStream(uc.getInputStream());
String recvstr=ois.toString();
ois.close();
System.out.println("recvstr::"+recvstr);
}
catch(Exception e)
{
System.out.println("Exception: "+e);
}
}
}

return recv;
}

public static void main(String args[])
{
check lc=new check("1$2$3$4$5$6$7");
lc.read();
}
}

Servlet
***********************************
package test;
import java.net.*;
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
import db.*;
public class slogo_chk extends HttpServlet
{
ResultSet result = null;
Connection conn = null;
PreparedStatement p_st = null;
Statement st = null;
boolean dbval = false;
ConnectionHandler1 ch = null;
public void init(ServletConfig sc) throws ServletException
{
super.init(sc);
try
{
ch=new ConnectionHandler1();
conn=ch.connect();
if(conn!=null)
{
dbval=true;
st=conn.createStatement();
}
else
dbval=false;
}
catch(Exception e)
{
dbval=false;
}
}
public void service(HttpServletRequest rq,HttpServletResponse rs) throws IOException,ServletException
{
PrintWriter pr = rs.getWriter();
pr.println("Hello Servlet");
 if(dbval)
 {
 try
 {
ObjectInputStream ois = new ObjectInputStream(rq.getInputStream());
String recvstr=(String)ois.readObject();
retval = "returing from servlet: "+recvstr;

String xx= new String(retval);


ObjectOutputStream oos = new ObjectOutputStream(rs.getOutputStream());
oos.writeObject((Object)xx);
oos.flush();
oos.close();
}
catch(Exception e)
{
}//ch//service

}
}
}

[Dave Vick]

Going to move this to the servlets forum.
Probably get a better response there

[arun mahajan]

Oh Dave where you have moved me? There seems no taker for this question....Please help me..
regards,
arun

[William Brogden]

What is the exact exception and where is it thrown?
Bill

[Tim Holloway]

It's very likely that the serializer of the client isn't compatible with the serializer on the server.
Try transmitting the data in text format instead of using writeObject.

[arun mahajan]

The exact Error is:
java.io.StreamCorruptedException: Caught EOFException while reading the stream h
eader
at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:727
)
at java.io.ObjectInputStream.<init>(ObjectInputStream.java:165)
at LogoServer.test.NewServer.readLocal(Compiled Code)
at LogoServer.test.NewServer.run(NewServer.java:46)

[Gerry Giese]

A little more info, please: + Is the client app or the servlet throwing the exception? I don't think that when you write your objects you should cast them as (Object). See The Java Tutorial: Serializing Objects.

[arun mahajan]

Server application is giving me this error. In any case I will look into the given link and will let you know how much helpful it is.
regards,
arun