CODEWITHSUNDEEP
servlets
lowLatency
lowLatency

Reputation: 5654

multiple request handle servlets

fact : servlet container creates one instance per servlet(hope i am correct on this fact)
quest: if suppose 2 requests are sent to the same servlet to update the x column in table Y for same record will the value sent by one request is going to be overriden by other request ? how this is handled, will the container is going to handle it by itself or ? please reply

Upvotes: 1

Views: 2178

Answers (2)

skaffman
skaffman

Reputation: 403441

fact : servlet container creates one instance per servlet(hope i am correct on this fact)

Not guaranteed, but usually true. So more an assumption than a fact.

if suppose 2 requests are sent to the same servlet to update the x column in table Y for same record will the value sent by one request is going to be overriden by other request ? how this is handled, will the container is going to handle it by itself?

This is up to the database, not the servlet container. There will be two threads using the same servlet instance, each with their own database connection.

But yes of course, the second request will overwrite the database value put there by the first request. Not sure how else you'd expect this to work.

Upvotes: 1

Cratylus
Cratylus

Reputation: 54074

There is 1 servlet instance. Correct.

But the request will be handled by different threads created by the container.
So the servlet code will be called by 2 different threads.

So make sure your code is thread safe

Upvotes: 0

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