If you want to pass parameters directly via EL I think your only option is to
write an EL Function. Everything else in JSF is based on method binding EL
which is a simple lookup. Method bindings depend on the bean having all the
requisite state prior to invocation.
You could write a custom JSF component that takes in JSF params and
communicates directly with your Seam component in Java land.
Or you can have a type specific context aware Seam component.
UserManager.printUser(), that knows where to look up the user entity within
Seam. This way JSF can take #{user} as a param and your Seam component can use
a well known location to function properly.
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