[jdjlist] Re: Thread-Safe JSP

[Emmanuel Eze]

Thanks Craig.

 

Assuming that I have this : <%! String s = "whatever"; %>

and somewhere in the JSP I have: <% s="something" %>

 

How can I synchronize the second block?  What do u think will happen when different threads executes the second block?

 

Thanks.

Emma

 

 

-----Original Message-----
From: Craig Malmfeldt [mailto:[EMAIL PROTECTED]]
Sent: Thursday, August 15, 2002 2:29 PM
To: JDJList
Subject: [jdjlist] Re: Thread-Safe JSP

Emma,

If you are declaring variables within the jsp you need to be careful how you are doing it. If for example you declare a variable within the code blocks <%!        String s = "whatever"; %>

This variable has global application scope for that jsp. Any changes in other methods would have to be synchronized or you are not thread safe.

However, if you declare a variable within a jsp within code blocks

<%  String s = "whatever"; %> then you need not worry about synchronization as this variable is declared within the service method of the jsp ( doGet, doPost) and each individual call to the jsp creates a new thread for the service method.

Craig

>Dear All,

>

>Is it necessary to synchronize methods in JSP so as to make them thread

>

>safe? When do I need to synchronize them? Again, if for instance my method

>

>need to return multiple values, in which case I'm forced to use instance

>

>variables since Java can only return a value. How can I make the JSP thread

>

>safe?

>

>Emma

>

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>http://www.sys-con.com/java/list.cfm

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