Serialization Error retrieving data from JSP to Applet

Question

I have an applet which calls a JSP to write data object to the db and then the JSP sends back the updated data object. The writing part is ok but the response is giving the following error. The data object is in a separate class which implements Serialized.
Here's the code in the applet calling the JSP and the response from the JSP
URL server = null;
String urlConnectionString = "http://localhost:7001/isLoginValid.jsp";
try
     server = new URL(urlConnectionString);
catch(MalformedURLException e)
     System.out.println("URL exception: " + e );          
// send request
ObjectInputStream response = null;
Object result = null;
try
     URLConnection conn = server.openConnection();
        conn.setDoOutput(true);
        conn.setUseCaches(false);
        conn.setRequestProperty("Content-Type", "application/octet-
        stream");
        ObjectOutputStream request = new ObjectOutputStream(new 
        BufferedOutputStream(conn.getOutputStream()));
     request.writeObject((Object)dvo);
     request.flush();
     request.close();
        // get the result input stream
     response = new ObjectInputStream(new BufferedInputStream
        (conn.getInputStream()));
     // read response back from the server
     result = response.readObject();
        if( result!=null && (result instanceof DataVO))
          dvo = (DataVO)result;
             String vo = dvo.printDataVO();
             System.out.println
             ("*****************DataVO********************\n"+vo);
     else
          System.out.println("not an instanceof DataVO");
catch(IOException ignored)
     System.out.println("Error in DataVO response");
     ignored.printStackTrace();
}Here's the code in the JSP sending the response back to the applet.
The 'dvo' object is the object which is serialized and has gets and sets
for the diff. data elements. When I print the 'dvo' before writing
the object to outputStream it prints the correct values for the data
element.
// send response
response.setStatus(HttpServletResponse.SC_OK);
ObjectOutputStream outputStream = new ObjectOutputStream (new BufferedOutputStream (response.getOutputStream()));
outputStream.writeObject(dvo);
outputStream.flush();ERROR is as follows:
Error in DataVO response
java.io.StreamCorruptedException: InputStream does not contain a serialized object
     at java/io/ObjectInputStream.readStreamHeader
     at java/io/ObjectInputStream.<init>
What am I doing wrong?. Please respond soon. Thanks

Answer 1

Here's the code. Yes I have it implementing serializable.
import java.io.Serializable;
import java.util.Date;
public class DataVO implements Serializable
     // Data Variables
     private     String uname;
     private     String pwd;
     private     String errorMSG;
     private     boolean multiMessage;
     private     boolean blnFirstTextField;
     private     boolean subscriptionError;
     private     boolean subscriptionCancelled;
     private     int userNumber;
     private     int status;
     private     int userCount;
     private     int userMax;
     private     int seqnum;
     private boolean loginValid;
     private int t_Interval;
     public DataVO()
          uname="";                   
          pwd="";                     
          errorMSG="";                
          multiMessage=false;        
          blnFirstTextField=false;   
          subscriptionError=false;   
          subscriptionCancelled=false;
          userNumber = -1;
          status = -1;   
          userCount = -1;
          userMax = -1;  
          seqnum = -1;   
          loginValid = false;
          t_Interval = 0;
     public String getUserName() {return uname;}
     public void setUserName(String uname) {this.uname = uname;}
     public String getPassword() {return pwd;}
     public void setPassword(String pwd) {this.pwd = pwd;}
     public String getErrorMessage() {return errorMSG;}
     public void setErrorMessage(String errorMSG) {this.errorMSG = errorMSG;}
     public boolean isMultiMessage() {return multiMessage;}
     public void setMultiMessage(boolean multiMessage) {this.multiMessage = multiMessage;}
     public boolean isBlnFirstTextField() {return blnFirstTextField;}
     public void setBlnFirstTextField(boolean blnFirstTextField) {this.blnFirstTextField = blnFirstTextField;}
     public boolean isSubscriptionError() {return subscriptionError;}
     public void setSubscriptionError(boolean subscriptionError) {this.subscriptionError = subscriptionError;}
     public boolean isSubscriptionCancelled() {return subscriptionCancelled;}
     public void setSubscriptionCancelled(boolean subscriptionCancelled) {this.subscriptionCancelled = subscriptionCancelled;}
     public int getUserNumber() {return userNumber;}
     public void setUserNumber(int userNumber) {this.userNumber = userNumber;}
     public int getStatus() {return status;}
     public void setStatus(int status) {this.status = status;}
     public int getUserCount() {return userCount;}
     public void setUserCount(int userCount) {this.userCount = userCount;}
     public int getUserMax() {return userMax;}
     public void setUserMax(int userMax) {this.userMax = userMax;}
     public int getSeqNo() {return seqnum;}
     public void setSeqNo(int seqnum) {this.seqnum = seqnum;}
     public boolean isLoginValid() {return loginValid;}
     public void setLoginValid(boolean loginValid) {this.loginValid = loginValid;}
     public int getTimeIntvl() {return t_Interval;}
     public void setTimeIntvl(int t_Interval) {this.t_Interval = t_Interval;}
     public String printDataVO()
          String returnString = "username = "+uname+"\n";
          returnString = returnString + "password = "+pwd+"\n";
          returnString = returnString + "errorMSG = "+errorMSG+"\n";
          returnString = returnString + "multiMessage = "+multiMessage+"\n";
          returnString = returnString + "blnFirstTextField = "+blnFirstTextField+"\n";
          returnString = returnString + "subscriptionError = "+subscriptionError+"\n";
          returnString = returnString + "subscriptionCancelled = "+subscriptionCancelled+"\n";
          returnString = returnString + "userNumber = "+userNumber+"\n";
          returnString = returnString + "status = "+status+"\n";
          returnString = returnString + "userCount = "+userCount+"\n";
          returnString = returnString + "userMax = "+userMax+"\n";
          returnString = returnString + "seqnum = "+seqnum+"\n";
          returnString = returnString + "loginValid = "+loginValid+"\n";
          returnString = returnString + "t_Interval = "+t_Interval+"\n";
          return returnString;
}