access non-oracle database from java oracle stored procedure

Is there any way to use non-oracle database driver from the inside of Java Oracle Stored Proc?

Working on import procedure I'm trying to connect to Paradox database using JDBC-ODBC Bridge. It works fine if I'm running my java class as a java application, but it cannot connect to Paradox if I'm running it as a Java Stored Procedure.

begin
  :v := apps.ImportTimeSheet.getValue;
end;

the result is:

Result = drv=sun.jdbc.odbc.JdbcOdbcDriver_at_529a1f68 java.sql.SQLException: found null connection context; sqlState=08003

package imp;

import java.sql.*;

import sun.jdbc.odbc.JdbcOdbcDriver;

public class TimeSheet {

    public static String getValue(){

        String url = "jdbc:odbc:importItime";

        String result = "";

        try{

            DriverManager.registerDriver(new sun.jdbc.odbc.JdbcOdbcDriver());

            Driver driver = DriverManager.getDriver(url);

            result = driver == null ? "driver is null " : "drv=" + driver.toString() + " ";

            result += "trying to get Connection: ";

            Connection connection = DriverManager.getConnection(url);

        } catch (SQLException e){

            result += e.toString() + "; sqlState=" + e.getSQLState();

        }

        return "Result = " + result;

    }

}

CREATE OR REPLACE PACKAGE ImportTimeSheet AUTHID CURRENT_USER AS FUNCTION getValue RETURN VARCHAR2; END ImportTimeSheet;

CREATE OR REPLACE PACKAGE BODY ImportTimeSheet AS FUNCTION getValue RETURN VARCHAR2 AS LANGUAGE JAVA NAME 'imp.TimeSheet.getValue() return java.lang.String'; END ImportTimeSheet;

• I uploaded uploaded sun/jdbc/odbc/*.* jar to oracle using loadjava