servlet problem

Hi all,
I did a stress test with apache bench (ab -n 1000 -c 10
http://onyx:8080/devserv/test2) on the below code (based
on 'basic.java' from the jdbc interface examples). Well
and while ab was running I also called the servlet from
netscape and got sometimes not the whole output. What's
wrong here ? Have I here a transaction problem ? Or some
other connection problems ? I tried first the whole
basic.java sample and the database got damaged and I
could not create any new tables. Well, here I think I
must do some transaction handling, right ? But the below
code does only some SELECTs ? Need I always some trans-
action handling ? I was thinking it's only needed for
writing.

Thanks,
Ralf

public class test2 extends HttpServlet {
PrintWriter out;
Connection db; // The connection to the database
Statement st; // Our statement to run queries with
String url = "jdbc:postgresql://onyx/test";
String usr = "test";
String pwd = "test";

public void doGet (HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException
{
try {
response.setContentType("text/plain");
out = response.getWriter();
out.println("START");
Class.forName("postgresql.Driver");
out.println("Connecting to Database URL = " + url);
db = DriverManager.getConnection(url, usr, pwd);
out.println("Connected...Now creating a statement");
st = db.createStatement();
out.println("\nRunning tests:");
out.println("Performing a query");
ResultSet rs = st.executeQuery("select a, b from basic");
if(rs!=null) {
while(rs.next()) {
int a = rs.getInt("a");
int b = rs.getInt(2);
System.out.println(" a="+a+" b="+b);
}
rs.close();
}
out.println("performing another query");
rs = st.executeQuery("select * from basic where b>1");
if(rs!=null) {
int col_a = rs.findColumn("a");
int col_b = rs.findColumn("b");

while(rs.next()) {
int a = rs.getInt(col_a);
int b = rs.getInt(col_b);
out.println(" a="+a+" b="+b);
}
rs.close();
}
out.println("Now closing the connection");
st.close();
db.close();
out.println("END");
out.close();
} catch(Exception ex) {
// We ignore any errors here
}
}
}