servlet init param and contect param


I am reading below link on servlets.

Waht are the cases or scenarios we need to pass init-param, context params to a servlet. I am not clear on that concept which was being used even in spring framework also.
How to know if to pass single servlet or to all servlets?
Please advise
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You are getting confused between init params that you define on a single servlet through web.xml and context params that are defined for the whole web application context.

init params are used by servlets to initialise themselves in the init() method.

Context params are used to set parameters on the entire web application so any servlet can access them.
gudii9Author Commented:
What are practically examples where we use both?
For example a particular servlet may have the role checking a customer is the right age to buy alcohol.
The age would be passed in as a init param not a context param.

a valid use of a context param would be to store something like a resource bundle file which every servlet in the the application is interested in.

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