Re: Servlet thread safety in Tomcat

[kwirirai]

Thanks ,It realy means I have to redesign the whole app ....,but there 
is the issue of networking and Java Mail, it seems the other servlet has 
to wait for a very long time for the other servlet to get all the 
mail.My question is can Tomcat process two sessions of a servlet  
downloading mail at the same time sopposing the other session is 
slow.Will the one with a faster connection finish first or will have to 
wait for the one with slow connection...?

Mike Curwen wrote:

The one thing that could be said (so far), is to ensure you are using
properly scoped variables.  Generally speaking, for servlets, that means
don't use something like the following:
public class myservlet extends HttpServlet {

  private String MyBadlyPlacedVariable = null;

  public void doGet() { // exceptions and parameters snipped for
brevity
     
       MyBadlyPlacedVariable =
request.getParameter("some_variable_used_later");

       // later on in the code, use "MyBadlyPlacedVariable"...
       // it probably contains a value you're not expecting!
  }
}
You'll for sure experince threading problems, and this is the most
likely cause of any class of problems that's generically described as:
"the data is actualy mixing up".
 

   

-----Original Message-----
From: kwirirai [mailto:[EMAIL PROTECTED]
Sent: Monday, February 09, 2004 12:48 PM
To: [EMAIL PROTECTED]
Subject: Servlet thread safety in Tomcat
Hi All
I am developing an application that uses JavaMail.What I am 
     

concered is 
   

the issue of thread safety,and efficiency.My question is do 
     

I need to 
   

employ synchronized blocks in my Servlet code or is there another way
     

to
   

implement thread safety.I have been experimenting with the 
     

application 
   

and I have seen that the data is actualy mixing up.I realy 
     

need to now 
   

how Tomcat handles request and issues those request ,this is in 
connection with threading. I have thought about the single 
     

thread model
   

in my servlets but I think this is an inefficient method to use.

Thanks
Kwiri


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