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Date: Sun, 10 Jul 2005 07:45:10 +0200 (CEST)
From: "Gianny Damour (JIRA)" <dev@geronimo.apache.org>
To: dev@geronimo.apache.org
Subject: [jira] Assigned: (GERONIMO-675) CMR / CMP Fields should not be
 read-only
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     [ http://issues.apache.org/jira/browse/GERONIMO-675?page=all ]

Gianny Damour reassigned GERONIMO-675:
--------------------------------------

    Assign To: Gianny Damour

> CMR / CMP Fields should not be read-only
> ----------------------------------------
>
>          Key: GERONIMO-675
>          URL: http://issues.apache.org/jira/browse/GERONIMO-675
>      Project: Geronimo
>         Type: Bug
>   Components: OpenEJB
>     Versions: 1.0-M4
>  Environment: Windows
>     Reporter: Matt Hogstrom
>     Assignee: Gianny Damour

>
> > On 14/06/2005 12:42 PM, Matt Hogstrom wrote:
> > 
> >>I have a typical bean sequence where there is an Order and a number of Order Lines.  (1 ... many)  The OrderEnt is created from a Session bean coincidentally named OrderSes.  The OrderEnt then in ejbPostCreate creates the appropriate OrderLines.  Here is the code from OrderEnt:
> >>
> >>    public void ejbPostCreate(OrderDataBean odb, boolean deferred) 
> >>    throws CreateException {
> >>  
> >>
> > <snip>
> > 
> >>Depending on the situation one of the above orderLineHome.create methods is invoked.  So far, so good.
> >>
> >>In the OrderLineEnt.create method things go a bit wrong. Here is the stack trace:
> >>
> >>Caused by: javax.ejb.EJBException: cmp-field [orderId] is read-only.
> >>        at org.tranql.ejb.ReadOnlyCMPFieldAccessor.set(ReadOnlyCMPFieldAccessor.java:44)
> >>        at org.openejb.entity.cmp.CMPSetter.invokeInstance(CMPSetter.java:74)
> >>        at org.openejb.entity.cmp.CMPMethodInterceptor.intercept(CMPMethodInterceptor.java:75)
> >>  
> >>
> > Based on this stack-trace, I confirm that the CMP field orderId is 
> > mapped to a foreign key.
> > 
> >>Here is the ejbCreate method that is failing
> >>
> >>     public OrderLineEntPK ejbCreate(int id, Integer orderId, String itemId, int quantity, BigDecimal totalValue, 
> >>              int olineStatus, java.sql.Date shipDate, BigDecimal msrp) throws CreateException {
> >>
> >>        if( debugging )
> >>            debug.println(3, "ejbCreate of ol_id = " + id + ", o_id = "
> >>                          + orderId);
> >>
> >>        setId(id);
> >>        setOrderId(orderId);                          <==================== This is the line that is failing.
> >>        setItemId(itemId);
> >>        setQuantity(quantity);
> >>        setTotalValue(totalValue.setScale(2, BigDecimal.ROUND_UP));
> >>        setOlineStatus(olineStatus);
> >>
> >>
> >>
> >>OrderId is the FK to the Order.  
> >>  
> >>
> > Fields mapped to foreign key columns are read-only. They are read-only 
> > for the following reason:
> > Let's assume that:
> > * we have one existing line item lineItemEntity;
> > * lineItemEntity is already related to an order orderEntity;
> > * orderEntity is related to two line items, lineItemEntity (as expected) 
> > and lineItemEntity2;
> > * we want to relate lineItemEntity to a new order orderEntity2;
> > * orderEntity2 is related to zero line items; and
> > * line item defines a CMR field order to set its related order.
> > 
> > In this specific scenario, if we set the CMR field order of 
> > lineItemEntity to orderEntity2, then:
> > * orderEntity2 is now related to the line item lineItemEntity; and
> > * orderEntity is now related to only one line item lineItemEntity2.
> > 
> > In this same scenario, if we set the CMP field orderId of lineItemEntity 
> > to the primary key of orderEntity2, then I am not sure of what the 
> > result should be. Indeed, it is a CMP field and no specfic semantic is 
> > attached to it.
> > 
> > To some extent, I am not sure that we should allow developers to update 
> > relationships via a direct update to the underlying foreign key columns. 
> > We could implement a fix to have a CMR semantic for CMP fields mapped to 
> > foreign ley columns; yet it does not sound good. Having said that, I do 
> > not have a strong opinion and I am happy to support such a scenario, if 
> > we need to.
> > 
> > Also, it is worth to notice that such a potential fix will only be able 
> > to handle CMP having simple primary keys. CMP having compound primary 
> > keys will still have a read-only approach.
> > 
> >>First question is the deployment right for this scenario?  If it is, then I think that the container is not acting correctly.  This code runs on WebLogic, Sun One, WebSphere, etc.
> >>  
> >>
> > Do you know if they properly support such scenarii (the CMP field must 
> > have a CMR semantic)? Also, do you know if they do not allow such 
> > scenarii in the case of compound PK CMP?
> > 
> > Thanks,
> > Gianny

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