jdbc connection issue in 8.0.3

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От	sankaran nambi
Тема	jdbc connection issue in 8.0.3
Дата	27 июля 2005 г. 16:26:44
Msg-id	20050727162632.86337.qmail@web54108.mail.yahoo.com обсуждение исходный текст
Ответы	Re: jdbc connection issue in 8.0.3 (Dave Cramer <pg@fastcrypt.com>)
Список	pgsql-jdbc

Дерево обсуждения

I am new to postgresql. I have installed pgsql server 8.0.3 in Redhat fedora core2. I have updated the pg_hba.conf file, to listen on a plain tcp/ip socket.

# "local" is for Unix domain socket connections only
local   all         all                                       md5
# IPv4 local connections:
host    all         all         127.0.0.1   255.255.255.255   md5
# IPv6 local connections:
host    all         all         ::1/128                       md5
#nossl for tcp/ip sockets
hostnossl all    &nbs p; all         127.0.0.1   255.255.255.255   md5

After doing this, I am able to connect to the server using psql with -h option. Also I can see the pgsql socket in nmap output.

-bash-2.05b$ nmap -p5000-6000 localhost

Starting nmap 3.50 ( http://www.insecure.org/nmap/ ) at 2005-07-27 09:18 PDT
Interesting ports on localhost.localdomain (127.0.0.1):
(The 1000 ports scanned but not shown below are in state: closed)
PORT STATE SERVICE
5432/tcp open postgres

Nmap run completed -- 1 IP address (1 host up) scanned in 0.376 seconds

However, I couldn't connect to the postgresql server using jdbc and java (1.5). I have listed the code below. it is very simple. it throws the error "No Suitable driver".

import java.sql.Driver;
import java.sql.DriverManager;
import java.sql.Connection;
import java.sql.SQLException;

class DB
{
    private String loginUser = "snambi";
    private String loginPasswd = "test123";
    private String loginUrl = "jdbc:postgresql://localhost/brokerdb";

private Connection connection = null;

void DB()
{}

    void connect()
    {
        createConnection( loginUser, loginPasswd, loginUrl );
    }

    void createConnection( String user, String passwd, String url )
    {
        try
        {
            Driver driver = (Driver) Class.forName("org.postgresql.Driver").newInstance();
            System.out.println("Does that driver like my url? " + driver.acceptsURL( url ) );

            connection = DriverManager.getConnection( user, passwd, url );
        }
        catch( Exception e )
        {
            e.printStackTrace();
            System.out.println("Error Connecting to Database " + e.getMessage() );
        }
    }

    public static void main( String[] args )
    {
        DB db = new DB();

db.connect();
}
}

The output of this program is ,

$java broker.DB
Does that driver like my url? true
java.sql.SQLException: No suitable driver
        at java.sql.DriverManager.getConnection(DriverManager.java:545)
        at java.sql.DriverManager.getConnection(DriverManager.java:171)
        at broker.DB.createConnection(DB.java:31)
        at broker.DB.connect(DB.java:21)
        at broker.DB.main(DB.java:44)
Error Connecting to Database No suitable driver

the classpath contains the jdbc driver.

$echo $CLASSPATH
:.:/home/snambi/otp/software/je-1.7.1/lib/je.jar:/home/snambi/otp/software//postgresql-8.0-312.jdbc3.jar:/home/snambi/otp/software/commons-collections-3.1/commons-collections-3.1.jar:/home/snambi/otp/software/activemq-3.0/lib/activemq-core-3.0.jar:/home/snambi/otp/software/activemq-3.0/lib/spring-1.1.jar:/home/snambi/otp/software/activemq-3.0/lib/concurrent-1.3.4.jar:/home/snambi/otp/software/activemq-3.0/lib/commons-logging-1.0.3.jar:/home/snambi/otp/software/activemq-3.0/lib/geronimo-spec-jta-1.0.1B-rc4.jar:/home/snambi/otp/software/activemq-3.0/lib/geronimo-spec-jms-1.1-rc4.jar:/home/snambi/otp/software/activemq-3.0/lib/geronimo-spec-j2ee-management-1.0-rc4.jar:/home/snambi/otp/pkgs/otp.jar

I have no idea what is missing.

I'd really appreciate any help in solving this problem.

thanks,

nambi

http://opentrade.sf.net

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