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From: "Leon Rosenberg" <struts_user@anotheria.net>
To: "'Tomcat Users List'" <tomcat-user@jakarta.apache.org>,
	<hwadechandler-apache@yahoo.com>
Subject: AW: Tomcat/JVM hangs in session.getAttribute / HashMap.get()
Date: Wed, 7 Sep 2005 21:35:10 +0200
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=20

> -----Urspr=FCngliche Nachricht-----
> Von: Wade Chandler [mailto:hwadechandler-apache@yahoo.com]=20
> Gesendet: Mittwoch, 7. September 2005 21:11
> An: Tomcat Users List
> Betreff: Re: Tomcat/JVM hangs in session.getAttribute / HashMap.get()
>=20
>=20
> Should be enough to explain the issue and why synchronization=20
> should be used.  I haven't looked at the Tomcat code, but why=20
> would a Session not use synchronized maps?  In my opinion=20
> it's not a bug in HashMap as it's up front about it not being=20
> synchronized.  To fix the original posters current situation=20
> they should be able to synchronize on an object when=20
> accessing the session...you'll just have to track down all of=20
> your calls which are setting and getting attributes and=20
> synchronize the code.
>=20

Unfortunately no. Not only you have to rewrite all your calls to the
session, you also have to rewrite all 3rd-party taglibs like struts,
tapestry, pager, jstl or whatever you are using. Each getAttribute must
become synchronized.
It is simply not possible to fix it, without patching tomcat.

Regards
Leon


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