I did the same thing on a project. I had one method
to set and get a plain JavaBean. I did use reflection
once I was inside the container managed EJB to
populate the values from the JavaBean to the EJB.
David
--- "Deadman, Hal" [EMAIL PROTECTED] wrote:
Although copyProperties to an entity bean might
work, it would be making a
call through the remote interface each time it sets
a property on the entity
bean. I think it's good practice to minimize the
number of remote calls made
to an EJB. (Often in practice the calls are not
really remote but it's good
to pretend like they could be.) That would allow you
to separate your JSPs
and EJBs or use Tomcat for JSPs and Weblogic for
EJBs. Normally instead of
calling set methods on an entity bean from the web
tier, I call a session
bean and pass a simple JavaBean to it that isn't
tied to Struts, often the
bean may have been nested in an ActionForm. Then I
have a create or an
update method in the entity bean that accepts the
JavaBean as an argument. I
don't always put all the getters and setters for
individual fields in the
entity bean remote interface unless I need them.
Sorry if this isn't helpful, I would be interested
to hear if anyone
disagrees.
Hal
-Original Message-
From: Bryan Field-Elliot
[mailto:[EMAIL PROTECTED]]
Sent: Tuesday, March 13, 2001 12:06 AM
To: [EMAIL PROTECTED]
Subject: More on my copyProperties/EJB woes
I've been tearing apart my problems using
copyProperties in an EJB
environment;
The scenario is that I am using
PropertyUtils.copyProperties to copy
everything FROM a simple bean, TO an EJB entity
bean.
Earlier tonight I thought that the hangup was over
the destination bean,
perhaps because it was an EJB remote interface. But
my digging turns up that
this isn't the case.
The exception is during the getting of the source
properties (from my simple
bean), and it never even gets to the setting of the
destination property.
I extracted a small piece of code from
copyProperties and am executing it
directly:
// pv is my simple bean, and "name" is a String
property within in, which
has a getter and a setter method.
PropertyDescriptor descriptor;
// Following two lines are key:
descriptor = PropertyUtils.getPropertyDescriptor(pv,
"name");
//descriptor = new PropertyDescriptor("name",
pv.getClass());
Method readMethod = descriptor.getReadMethod();
Object value = readMethod.invoke(pv, new Object[0]);
When I use the first of the two "descriptor = "
lines (thereby making use of
Struts), I get the following exception on the
invoke() line:
Name: java.lang.IllegalArgumentException
Message: object is not an instance of declaring
class
Stack: java.lang.IllegalArgumentException: object is
not an instance of
declaring class
at java.lang.reflect.Method.invoke(Native Method)
However, when I use the second of the two
"descriptor = " lines (thereby
using standard Java SDK reflection), the invoke()
line executes correctly.
Any help would be appreciated.
This is using Struts 1.0 beta-1 (binaries).
Regards,
Bryan
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