I also stumbled across this problem.
One solution could be to use a TypeConverter to instantiate new,
unmanaged entities during the ParamsInterceptor invocation.
Such a TypeConverter could pass back instantiated, blank entities
(with nothing but the ID) for ParamsInterceptor to collate, and
against which ValidationInterceptor can operate. E.g. for param
'bean=69', the type converter instantiates Bean and calls setId(69)
Once Validation succeeds, ModelDriven and ParamsInterceptor should be
invoked again to update the managed entities.
The unmanaged entities would just disappear out of scope and be
garbage collected.
Such a strategy would require modification to ParamsInterceptor to
tell it to use the initial TypeConverter on the first call, but not on
the second. Whether the algorithm that controls that is accessible for
modification in the ParamsInterceptor or whether it is out-of-reach in
OGNL somewhere, I'm not sure.
If it was a blank (just id) entity then you'd lose the ability to
validate "num1 > num2" where num1 was set by the params interceptor but
num2 came from the database.
-Chase
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