>> So, what exactly does it mean when we say that Tomcat is thread safe
>> for
>> requests.
>> Tomcat creates a new thread for each request, so somehow my static
>> methods
>> are then thread safe (incdirectly, since it is managed by Tomcat).
I actually searched all over to try find something for you.... this looks ok
http://www.codestyle.org/java/servlets/faq-Threads.shtml
But here my un-scientific way of thinking about it...
When tomcat sends a thread into your doGet method...
All those local variables in that thread are ok...
So I think about it as each thread being a lane on a big freeway/highway...
So yes you right in a way... Tomcat isnt allowing those local method
variables to get mixed up...
but the second you decalare a static method or static variable... you had
better be sure its thread safe.
What happens to that highway is that all the lanes merge into one, and every
car has to go through it...
When you add synchronized... your 30 lane high way becomes a single lane and
its one car at a time...
You dont want to add synchronized because here you have the TC guys gone
thru all the hassle of making sure you can have a 30 lane highway... and you
bang it into one lane.... so new is better because each lane gets its own
engine... and java is pretty damn good at garbage collecting, that little
bit of memory is a blip on the radar screen...
You got to really know what your code is doing when its static... you got to
know its thread safe, and it can be really hard to see that 30 car pile up
coming on the highway ;)
My way of thinking about this stuff..... mad science - chapter 1 ;)
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