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From Mark Thomas <ma...@apache.org>
Subject Re: 404 during application redeploying
Date Fri, 07 Aug 2015 09:25:06 GMT
On 07/08/2015 10:00, Pavel Cibulka wrote:
> Hi, I'm using Tomcat 8.0.23 on Ubuntu 14.04. When I redeploy application
> (by replacing WAR file), tomcat returns 404 for short period of time. Is
> this intended?

Yes.

> I have found in:
> https://bz.apache.org/bugzilla/show_bug.cgi?id=53024
> Bug 53024 - Accessing Servlet while Reloading context gives 404 error
> Mark Thomas 2012-05-08 19:08:09 UTC
> "Thanks for the test case. This has been fixed in trunk and 7.0.x and will
> be included in 7.0.28 onwards.
> I also took the opportunity to improve the handling when a watched resource
> (such as web.xml) changes. This is now handled with a reload (so no 404s)
> rather than stop followed by a start."
> 
> It seems to me, that Tomcat should pause requests on redeploy instead of
> returning 404. Or does this works differently for WAR files?

It depends.

redeploy != reload and which you get depends on circumstances. I
strongly recommend that you read this page:
http://tomcat.apache.org/tomcat-7.0-doc/config/automatic-deployment.html

There are a number of ways you could get the reload behaviour you want.

1. Use an external context.xml file. Updates to the WAR would then only
result in a reload.

2. Use parallel deployment

http://tomcat.apache.org/tomcat-7.0-doc/config/context.html#Parallel_deployment

HTH,

Mark

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