Object deserialization problems?

Question

A bit of a crosspost perhaps but not really sure if new to java or java programming is really the right place..anyway..i have a resultset containing object serializations..in the code below rs is a ResultSet;
while(rs.next()){
       ObjectInputStream in = new ObjectInputStream(rs.getBinaryStream(1));
       productionRule rule = (productionRule)in.readObject();
       answer.add(rule);
     }this works on the first time round and returns the properly deserialized object in rule..which is then added to the LinkedList answer but on the second iteration the line;
       ObjectInputStream in = new ObjectInputStream(rs.getBinaryStream(1));produces an IOException with a getMessage() of Invalid Stream header
I have no idea why this is occurring..does any one have any idea?

Answer 1

The ResultSet.getBinaryStream() says the following
Note: All the data in the returned stream must be read prior to getting the value of any other column. The next call to a getXXX method implicitly closes the stream. Also, a stream may return 0 when the method InputStream.available is called whether there is data available or not.
Maybe, when you leave the first row, it is closing down the inputstream on the second row before you can read it ? Strange... but fits the symptoms.
Could it be, that the inputstream you receive is valid for the entire resultset ? Ie. you can read multiple objects from one getBinaryStream() call on a resultset, outside of your while loop ???
regards,
Owen