I'm using the modeldriveninterceptor to populate the model objects in my
actions. For save and add operations, this works fine. For loading
operations, I'm having some problems. My load code looks something like
this:
this.model = saveCustomer(customer, session);
In this case, the "model" instance variable is the same thing that gets
returned from the "getModel()" method needed to implement ModelDriven.
Here's how it is declared in the class:
Customer model = new Customer();
The problem is that after the model instance is updated in the action class,
the updates aren't reflected in the value stack. On a velocity result page,
if I do "$stack.findValue("name")" (assuming Customer has a getName()
property), I just get "name" back rather than the value. If I call
"$stack.findValue("top")", I get info about an empty customer object (the
"model" variable initialized for the new action instance). If I call
"$stack.findValue("model"), I get info about the actual saved customer
rather than the empty customer.
It looks like somehow the reference to the model class, stored at the top of
the stack thanks to the ModelDrivenInterceptor, isn't reflecting changes to
the model object to which it was originally pointed. "top" in the stack gets
me the original model object before the save, and "model" gets me the
updated version. The interceptor pushes into the stack on its "before"
method, so I can understand how the original, empty version gets in there,
but I fail to see how its not getting updated. How is this happening, if, as
I would expect, the reference on the stack is just an object reference? Or,
when things are put into the stack, are they copied by value instead of by
reference?
For now, I can just call "stack.push()" in my action after a load, but this
seems to be redundant and reflect something missing in the
ModelDrivenInterceptor. Should the interceptor call the same code in it's
"after" method (which is now blank) as it does in its "before" method? Or is
there some other solution?
Thanks,
Drew
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