The solution to the problem applies to the 2.1 API (i.e the setAttribute
routine). What is a viable solution using the 2.0 API?
dino
-----Original Message-----
From: A.W.F. Boer <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
Date: Thursday, October 07, 1999 6:09 AM
Subject: Re: QoW - How can I share objects among servlets?
>(Original question had empty subject line -- see below)
>
>The Question of the Week is definitely for real. Static information should
only
>be accessible to servlets within a single ClassLoader context. Different
>instances of one single servlet class invoked through one name/url (i.e.
one
>service) are able to use the Singleton pattern to share objects. Instances
of
>different servlet classes, or of different services (more names), may (and
>should) not be because they may (and should) be loaded by a different
>ClassLoader.
>
>I am willing to believe that your system does allow this type of sharing,
in
>particular if the Singleton class is loaded through some system CLASSPATH.
>Any 'public static' information modifiable in this way compromises the
security
>of information in your servlet and may cause unwanted interactions between
>servlets if you are unaware of that. It is better to use the method
proposed by
>Sun because it is safer and portable between servers.
>
>Even better is not assuming that the other servlets of your application
will run
>in the same servlet support. If I were an ISP or systems administrator, I
would
>not guarantee that. I would test the servlets in different servlet support
>environments and reject them if they turn out to require eachother's
presence.
>
>The recent thread "Sharing static variables between servlets" discusses
this
>type of sharing in the context of a specific servlet support environment.
Jud-
>ging from the QoW of Sun, Sun does not approve of this type of
servlet-specific
>code.
>
>
>Alexander W. F. Boer
>Dept. of Computer Science and Law,
>University of Amsterdam, the Netherlands
>email: [EMAIL PROTECTED]
>
>----- Original Message -----
>
>Van: Dino Valente[SMTP:[EMAIL PROTECTED]]
>Antwoord naar: A mailing list for discussion about Sun Microsystem's Java
Servlet API Technology.
>Verzonden: Wednesday, October 06, 1999 11:40 PM
>Aan: [EMAIL PROTECTED]
>
>Hi all,
>
>Has anyone checked out the question of the week from the Java Developer
>Connection ( http://developer.java.sun.com/developer/qow ; How can I share
>objects among servlets)?
>
>Is this question for real as well as the answer? In other words, you can't
>use the Singleton pattern with servlets? (I don't seem to have this problem
>in my system).
>
>dino
>
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