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From Sean Dockery <>
Subject Re: Web.xml mistake results in <Context> unavailable !?
Date Thu, 06 Feb 2003 00:18:56 GMT
Yes, I was assuming that the manager application was enabled and 
accessible.  Your original message did not specify otherwise.

One option you have...

   Look through the manager application source code to determine how it 
causes a context to be started/reloaded.  Copy that functionality into a 
separate application (if possible).  Because you control the names under 
which a context is deployed, you simply have to have the student 
authenticate in this application and you can determine (through database, 
xml file, or property file) which context to start/reload.

Variation on the above...

   Write the application to handle requests for reloading a context with 
the same process as above.  But instead of hosting the functionality of 
starting/reloading a context, construct a request that include 
authentication on the server-side to get the manager application to 
start/reload the application.  For example...


   ...shows a simple form which accept the student's username and 
password.  action goes to...


   ...which authenticates the student, throwing them back to the previous 
page if they fail.  If they successfully authenticate, construct an HTTP 
request that includes authentication for the manager application.  From the 
server, open the socket to localhost on port 8080, pass the request "GET 
/manager/html/reload?path=/myapp" along with the appropriate authentication 
data (BASIC or DIGEST) so you don't get a forbidden error.

   Users can then reload their own context without knowing the manager 
application password.

   If you want, you can hire me to write this for you.  :-)

Another option I've heard of...

   Schedule a UNIX cron task (or Windows Server "at" task) which stops 
Tomcat every hour on the hour.  Schedule a second UNIX cron task (or 
Windows Server "at" task) that starts Tomcat every hour in the fourth 
minute of the hour.  That way, students experience a maximum of one hour of 

One last recommendation...

   Teach the students how to validate their web.xml file against the DTD 
outside of Tomcat so that they are less likely to end up publishing a 
bunged web.xml file.

At 18:40 2003-02-05 -0500, you wrote:
>That is assuming the manager application is enabled.  I was hoping for more
>of an internal solution that Tomcat can do itself.  This is being used in an
>educational environment and everytime a student blows up his context, he/she
>shouldnt have to run to the prof to reload the application...
>----- Original Message -----
>From: "Sean Dockery" <>
>To: "Tomcat Users List" <>
>Sent: Wednesday, February 05, 2003 6:38 PM
>Subject: Re: Web.xml mistake results in <Context> unavailable !?
> > One of the following should work...
> >
> > http://localhost:8080/manager/html/start?path=/yourwebapp
> >
> > or
> >
> > http://localhost:8080/manager/html/reload?path=/yourwebapp
> >
> > This will prompt the Tomcat manager application to either start or reload
> > your application.
> >
> > At 17:59 2003-02-05 -0500, you wrote:
> > >In Tomcat 4.1.18, i have several different contexts each with a
> > >corresponding WEB-INF hierarchy and web.xml. Now, if I make a mistake in
> > >the web.xml like i forget to end a </servlet> tag, it says that there
> > >parse error and then "Marking this application unavailable due to
> > >error(s)" and I cannot use the context ever again until the server
> > >restarts. How can i fix this so the context gets checkd again at some
> > >
> > >Kevin
> >
> > Sean Dockery
> >
> > Certified Java Web Component Developer
> > Certified Delphi Programmer
> > SBD Consultants
> >
> >
> >
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail:
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> >
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Sean Dockery
Certified Java Web Component Developer
Certified Delphi Programmer
SBD Consultants

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