private varibles in servlet

[sitaram irrinki]

can we write private variables in servlet?if yes how they are managed by multiple threads?

[Makarand Parab]

Hi
If it is a private instance variable, that variable will be shared by all the threads. Having a instance variable in servlet is highly discouraged. Well i never define one.
If you define a variable inside the service, dopost, doget methods as it is a local variable for the method, it gets created per thread and is blown off when the method ends.

Hope it makes sense
Let me know if i am wrong.

Regards
Makarand Parab

[Scott Duncan]

Makarand is correct. Object vars are not thread safe in a servlet. static final is OK and possibly even variables that are ONLY initialized in the init method and therefore not changed. If this is a concern make them member/method vars where they will be thread safe.