pgpool master or slave goes down java access error

hi pgpool Expert

my architecture as follows:
Master/Slave with Streaming Replication and pgpool-II
version of pgpool-II is pgpool-II.3.0.4
version of PostgreSQL is 9.0.2

I am using pgpool works as master/slave sub mode stream

and pgpool key configuration is:
=====================================================================================================

num_init_children=100
max_pool=4
child_life_time=60
connection_life_time=0
child_max_connections=0
client_idle_limit=0
connection_cache=true

=====================================================================================================

and java jdbc connection test code as fllows:

=====================================================================================================
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class TestPgpool {
    public static void main(String[] args) {

        for(;;){
           Thread th = new Thread(new TestThread());

           th.start();
           try {

               Thread.sleep(10);

           } catch (InterruptedException e) {
               System.out.println("1--------------");
               e.printStackTrace();
               System.out.println("1--------------");
           }
       }
   }

   static class TestThread implements Runnable{

       public void run() {

           Connection con = null;

           Statement stmt = null;
           try {

               Class.forName("org.postgresql.Driver");

               con = DriverManager.getConnection(


"jdbc:postgresql://192.168.1.116:9999/spring250_20100630_705",

                    "postgres","postgres");

               stmt = con.createStatement();

               String sql = "SELECT * FROM bb_member limit 1";

               ResultSet rs = stmt.executeQuery(sql);
               System.out.print("OK(");

               while(rs.next()){

                   System.out.print(rs.getInt(1) + "="

                             + rs.getString(2) + " ");
               }

               System.out.println(")");
               stmt.close();
               con.close();
           } catch (SQLException e) {
               System.out.println("2--------------");
               e.printStackTrace();
               System.out.println("2--------------");

           } catch (ClassNotFoundException e) {
               e.printStackTrace();
           }
       }
   }
}
=====================================================================================================

question:

    I do some db falt tests
    1)the test code run always connect pgpool,
    2)test master or slave go down

    but when mster or slave go down ,java code throws exception :

    org.postgresql.util.PSQLException: An I/O error occurred while sending to
the backend
    org.postgresql.util.PSQLException: The connection attempt failed.

    the error happened once for little time,then goes normal.

what should I do to solve this problem?and show the reason about the matter.

thanks for any help

jeno

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