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How to Make Servlet Thread Safe

There are two different ways of making a servlet thread 
safe namely

1.By implementing SingleThreadModel.

By implementing a SingleThreadModel it will be possible to 
create a Thread safe servlet.There can only be one user at 
a given point of time.

2.Synchornize the part of sensitive code.

We can allow a single user at a given point of time by 
making that part of the code which is sensitive as 
synchronized.

3.Do not instance variables into our servlet we use only 
local variables
 

Good description:
http://www.javaworld.com/javaworld/jw-07-2004/jw-0712-threadsafe.html