How to write an ObjectOutputStream to URL connection and rx via an applet

Question

Hi, i am final year Bsc student from portsmouth England struggling to write an object to a servlet response stream.
applet code:
URLConnection connection;
ObjectInputStream in = null;
DataCarrier today = null;
try{
//connect to url
     URL url = new URL("http://localhost:8080/myapp/getObjectives");
     connection = url.openConnection();
     connection.setDoInput(true);
// create in object to read from connection response
/* using print statements i can confirm that this line is not completing */
ObjectInputStream ois = new ObjectInputStream(connection.getInputStream());
//print line here does not print
//type cast incoming object
today = (DataCarrier)ois.readObject();
     ois.close();     
catch (Exception e) { }
Servlet Code:
//declare DataCarrier class variables
DataCarrier test;
test = new DataCarrier();
test.x = 100;
test.s = "hello";
//create output stream from response output stream
ObjectOutputStream oos = new ObjectOutputStream(new BufferedOutputStream(resp.getOutputStream()));
//write object
oos.writeObject(test);
     oos.flush();
     oos.close();
the code compiles and runs ok, with the only error being a nullpointer exception when trying to type cast response object in applet.
This is because the ObjectInputStream isnt being created.
I have spent the last week seeking help from lecturers trying to solve this problem with no success what so ever.
So if any one can offer any advise or comments they will be welcomed with open arms.
Many thanks in advance.
dthom

Answer 1

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