Spring PropertySource and Environment

[Brent Putman]

In poking around, I discovered something else interesting about
PropertySource usage.  In a web application context, in addition to the
default ProperySource impls which read from system properties and from
environment vars, the web context gets 2 additional ones that read from
servlet context and servlet init params. 

One could do PropertySource-based replacement based on those directly, I
suppose.

It also means, I think, that in an ApplicationContextInitialzier impl,
one could for example read a base directory property from one of those
params (system/environment/servlet) by using the appropriate
PropertySource from the context that is passed in, and then load up some
new properties relative to that for a new PropertySource, or whatever. 
Maybe useful, maybe not.

Fwiw, there is also a JNDI PropertySource impl included.

Looks like writing a custom PropertySource impl is also pretty easy, so
that's an option too.


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