StreamCorruptedException: invalid stream header

[Madhu Palutla]

Hi,
I am sending a vector from an applet to servlet.When I tried to execute applet from browser I am getting above error in the Weblogic console.

I am sending data using ObjectInputSTream...
The code is like below...
The applet:

public void sendObjToServer(Vector loginParamaters)
{
URL url = null;
URLConnection urlConn = null;
InputStream is = null;
DataOutputStream outs = null;
ObjectInputStream ois = null;
try
{
url = new URL("http://co78565:7001/test");
urlConn = url.openConnection();
urlConn.setAllowUserInteraction(true);
urlConn.setDoOutput(true);
urlConn.setUseCaches(false);
urlConn.setRequestProperty("Content-Type","application/x-www-form-urlencoded");
ObjectOutputStream objOutStream = new ObjectOutputStream(urlConn.getOutputStream());
objOutStream.writeObject(loginParamaters);
objOutStream.flush();
objOutStream.close();
}
catch(Exception e)
{
System.out.println("Exception exp"+e);
e.printStackTrace();
}

--------------------------
in servelt:

public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
{
ObjectInputStream inputFromApplet = null;
PrintWriter out = null;
Hashtable hashValue = new Hashtable();
try
{
inputFromApplet = new ObjectInputStream(request.getInputStream());
loginInfo = (Vector) inputFromApplet.readObject();
inputFromApplet.close();
System.out.println(" loginInfo values in servelt "+ loginInfo);
User = (String)loginInfo.elementAt(0);
pwd = (String)loginInfo.elementAt(1);
clt = (String)loginInfo.elementAt(2);
host = (String)loginInfo.elementAt(3);
lang = (String)loginInfo.elementAt(4);
sys = (String)loginInfo.elementAt(5);
R3ConnectionInfo ci = new R3ConnectionInfo(User, pwd, clt, host, sys, lang);
FunctionGroup group[] = RfcFunctionSearch.fetchRfcFunctions(ci, "Z*", null);
for (int i = 0; i < group.length; i++)
{
RemoteFunction functions[] = group[i].getFunctions();
String[] functionNames = new String[functions.length];
for (int j = 0; j < functions.length; j++)
{
functionNames[j] = functions[j].getFunctionName();
}
hashValue.put(((String)group[i].getGroupName()),functionNames);
}
}
catch(Exception e)
{
System.out.println(" Exception in doPost()"+ e);
}
System.out.println(" Hash Table output is :"+hashValue.toString());
sendBORList(response, hashValue);
}

-----------------------
ERROR in the CONSOLE:
Exception in doPost()java.io.StreamCorruptedException: Caught EOFException while reading the stream header

I am using weblogic server as app server and i am getting error at
inputFromApplet = new ObjectInputStream(request.getInputStream());
in the servlet..
Any help in this regard appriciated well.
Thanks,
Madhu Palutla
[ July 12, 2002: Message edited by: Madhu Palutla ]
[ July 13, 2002: Message edited by: Madhu Palutla ]

[Donal Lynch]

What's in the input stream returned by request.getInputStream(), if it's not a correctly serialised object? You should be able to get some idea by reading the stream byte by byte and printing the bytes out. One possibility (strongly suggested by the EOF exception on reading the stream header) is that there's nothing at all in the stream.
What's getting sent out by the HttpURLConnection? It manages to contact the servlet, which indicates that it's at least sending out the headers of a valid HTTP request, but possibly it's not appending the serialised object. The quick and dirty method I use is to point the url at a server that does nothing but sit on a port and print out what arrives:

  
public static void main( String[] args ) 
  throws Exception {
    ServerSocket ss = new     ServerSocket(Integer.parseInt(args[0]));
    while(true) {
        Socket s = ss.accept();
        InputStream in = s.getInputStream();
        int c;
        while( (c=in.read())!=-1 ) {
            System.out.write(c);
            System.out.flush();
        }
}
}