http://en.wikipedia.org/wiki/Serialization
try ..implements Serializable
debug with Log4j..here is a good tutorial
Logger barlogger = Logger.getLogger("com.foo.Bar");
// This request is enabled, because WARN >= INFO.
logger.warn("Low fuel level.");
// This request is disabled, because DEBUG < INFO.
logger.debug("Starting search for nearest gas station.");
http://logging.apache.org/log4j/1.2/manual.html
Martin
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> Date: Mon, 9 Feb 2009 19:39:50 -0500
> From: ch...@christopherschultz.net
> To: users@tomcat.apache.org
> Subject: Re: sessions lost after redeploy
>
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Robert,
>
> J Robert Ray wrote:
> > I don't see anything relevant in the logs. My session consists of a
> > single value, a Byte[], so I shouldn't have a problem with
> > unserializable data. Besides, it reloads properly across a tomcat
> > restart.
>
> Yeah, that should work.
>
> > Do you have an app that preserves sessions through a redeploy?
>
> I have several of them, in fact, though they all happen to be TC 5.5
> installs. I can even redeploy the same webapp and have the sessions
> persist across the server restart or webapp reload.
>
> I'm not sure what the best way is to get debugging output from that
> component.
>
> - -chris
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