What are the special design care that must be taken when you work with

Question :What are the special design care that must be taken when you work with
local interfaces? (EJB)
Answer :It is important to understand that the calling semantics of local interfaces
are different from those of remote interfaces. For example, remote
interfaces pass parameters using call-by-value semantics, while local
interfaces use call-by-reference.
This means that in order to use local interfaces safely, application
developers need to carefully consider potential deployment scenarios up
front, then decide which interfaces can be local and which remote, and
finally, develop the application code with these choices in mind.
While EJB 2.0 local interfaces are extremely useful in some situations, the
long-term costs of these choices, especially when changing requirements
and component reuse are taken into account, need to be factored into the
design decision.