Explicit cast needed to convert java.* to to oracle.*

Hello,
I am trying to compile and run the following JSP but keep getting the "Incompatible type for = Explicit cast needed ..." error. The JSP and oracle procedure code are as follows:
<%@ page language="java" import="java.sql.*" %>
<%@ page import="oracle.jdbc.driver.*" %>
<HTML>
<HEAD>
<TITLE>
SimpleQuery JSP
</TITLE>
</HEAD>
<BODY BGCOLOR=EOFFFO>
<TABLE BORDER=1 BGCOLOR="C0C0C0">
<TH BGCOLOR="white"> <I>Node ID</I> </TH>
<%
     Connection con = null;
OracleCallableStatement cstmt= null;
     ResultSet rs = null;
try {
          String SYSTEM_DB_DRIVER =
"oracle.jdbc.driver.OracleDriver";
String SYSTEM_DB_URL =
"jdbc:oracle:thin:@myserver.com:1521:";
String SYSTEM_DB_FILE = "CONN_STRING";
String SYSTEM_DB_USER = "UNAME";
String SYSTEM_DB_PASSWORD = "PASSWD";
          Class.forName(SYSTEM_DB_DRIVER);
con = DriverManager.getConnection(SYSTEM_DB_URL +
SYSTEM_DB_FILE, SYSTEM_DB_USER, SYSTEM_DB_PASSWORD);
          cstmt = con.prepareCall("call eaicl_p_requirement.open_rule_dtl(?,?)");
          cstmt.registerOutParameter(1, OracleTypes.CURSOR);
<<I think I have to pass the p_product_id_in here but not sure how>>
          cstmt.execute();
          rs = ((OracleCallableStatement)cstmt).getCursor(1);
          while(rs.next())
          {%>
     <TR>
     <TD ALIGN=CENTER> <%= rs.getString(1) %> </TD>
     <TD ALIGN=CENTER> <%= rs.getInt(2) %> </TD>
</TR>
          <%}
               rs.close();
cstmt.close();
con.close();
catch(Exception e)
%>
</TABLE>
</BODY>
</HTML>
The Oracle PL/SQL package.procedure it is calling is:
     PROCEDURE open_rules_dtl (
          prc_rules_dtl_out          OUT     rc_fetch_rule_dtl,
          p_product_id_in          IN          NUMBER )
     IS
          vrc_rules_dtl               rc_fetch_rule_dtl;
     BEGIN
          OPEN vrc_rules_dtl FOR
               SELECT
                    r.rule_id,
                    r.rule_name,
                    r.rule_objective,
                    r.rule_description,
                    r.clearance_requirement,
                    r.rule_type
               FROM
                    eaicl_rule r
               WHERE
                    r.is_old = 'N' AND
                    r.product_id = CHR( p_product_id_in )
               ORDER BY
                    r.rule_name
          prc_rules_dtl_out := vrc_rules_dtl;
END open_rules_dtl;
I keep getting the following error on the webserver:
[05/Dec/2001:16:56:02] info ( 632): JSP: JSP1x compiler threw exception
org.apache.jasper.JasperException: Unable to compile class for JSPC:\iPlanet\Server4\https-wacc\config\..\ClassCache\_jsps\_ss_test5_jsp.java:84: Incompatible type for =. Explicit cast needed to convert java.sql.CallableStatement to oracle.jdbc.driver.OracleCallableStatement.
          cstmt = con.prepareCall("call eaicl_p_requirement.open_rule_dtl(?,?)");
          ^
I'm not sure how to fix it. I also need to pass the p_product_id parameter to the procedure.
Hope someone can point me in the right direction. Thanks.

Here's how you do an explicit cast:cstmt = (OracleCallableStatement)con.prepareCall("call eaicl_p_requirement.open_rule_dtl(?,?)");

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