problem in using DatabaseMetaData getColumns()

hello

i am getting error while using uisng
dmd.getColumns(null,null,MY_TABLE_NAME,null);
i am gtting error while using the new pgjdbc2.jar
driver with the old driver postgresql.jar this method
is working .can you help me in solving this problem.
i am sending a sample code

import java.sql.DatabaseMetaData;
import java.sql.SQLException;
import java.sql.ResultSet;

class CheckDB
{
public static void main(String args[])throws
Exception{

String MY_TABLE_NAME="computers";
Connection con;

try
{

Class.forName("org.postgresql.Driver");
con =
DriverManager.getConnection(jdbc:postgresql://localhost/mytab,loginname,password);

DatabaseMetaData dmd = con.getMetaData();
String[] tableType = {"TABLE"};

ResultSet rs = dmd.getTables(null, null, null,
tableType);

while ( rs.next() )
{
if(MY_TABLE_NAME.equals(rs.getString( "TABLE_NAME"
)))
System.out.println(MY_TABLE_NAME +" found in
database " ) ;
}
rs.close();

rs = dmd.getColumns(null,null,MY_TABLE_NAME,null);
// when i try to use
getColumns(null,null,MY_TABLE_NAME,null); method
// i am getting exception :ERROR: parser: parse
error at or near "("
// i am gtting this error while using the new
pgjdbc2.jar Driver
// with the old driver postgresql.jar this method is
working

while(rs.next())
{
colNames[totalFields]=rs.getString( "COLUMN_NAME"
);//here COLUMN_NAME is a key word
System.out.println("COLUMN_NAME : " +
colNames[totalFields]);
}
rs.close();

}
catch(SQLException e)
{
System.out.println("here i am :"+e.getMessage());

}
}
}

=====

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