How does JSP process concurrent requests?

Question

I guess my question is, a JSP is compiled into a single servlet instance that serve multiple requests. How do I make it threadsafe?

score 4 · Accepted Answer · answered Mar 22 '11 at 20:19

Servlets are meant to be immutable. Either no state exists outside of method calls (the servlet is stateless), or any such state will never change (so the state that each thread sees is always the same).

It's extremely simple to write a threadsafe servlet: never use instance variables. Use method-local variables.

score 2 · Answer 2 · answered Mar 22 '11 at 20:19

2

Try this: <%@ page isThreadSafe="true" %>

answered Mar 22 '11 at 20:19

iluxa

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This is the default and it does not make the page ThreadSafe, it indicates to the container it can process concurrent requests safely... – Will Mar 22 '11 at 20:43
Thanak you for clarifying this for me. – Scicare Mar 24 '11 at 19:22

score 2 · Answer 3 · edited Jun 20 '20 at 09:12

Just don't assign request/session specific data as global/static variables. So as long as you don't use scriptlet declarations <%! %> which you assign with request/session specific data and you don't put request/session data in application scope (i.e. as attribute of ServletContext), then you're safe.

How does JSP process concurrent requests?

4 Answers4

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