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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