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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