getting exception when trying to close connection

[Christian J. Dechery]

I know my implementation isn't the best there is... take a look at this code:
 
 protected void finalize() {
  try {
   if( con!=null && !con.isClosed() && con.getAutoCommit() ) {
    con.close();
   }
  }
  catch(SQLException sqle) {
   System.out.println("["+this.getClass().getName()+"] N�o foi poss�vel fechar a 
conex�o. "+sqle.toString()+"\n");
//   sqle.printStackTrace();
  }
 }

that's what I use to TRY to close all connections... this code is in my DAO class. 
Sometimes I have up to four DAO classes instantiated in a single JSP... I debugged 
it... at least one always fails to close giving me this exception: "I/O error: socket 
closed"
 
what does that mean? what socket? And why did all the other connections closed and 
this didn't?
 
.:| Christian J. Dechery
.:| FINEP - Depto. de Sistemas
.:| [EMAIL PROTECTED]
.:| (21) 2555-0332