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For 2021 - online Python 3 training - see ((here)).

Our plans were to retire in summer 2020 and see the world, but Coronavirus has lead us into a lot of lockdown programming in Python 3 and PHP 7.
We can now offer tailored online training - small groups, real tutors - works really well for groups of 4 to 14 delegates. Anywhere in the world; course language English.

Please ask about private 'maintenance' training for Python 2, Tcl, Perl, PHP, Lua, etc.
tomcat-users.xml; what a difference a space made

Product: Apache Tomcat release 6.0.something

Symptom: After some fine tuning of the configuration files, a working installation was no longer working ... requests for web pages resulted in the browser hanging and waiting, in perpituity it seemed, for a response. In other words, the connection was being made to the port but no response returned.

Analysis / solution: It turns out that extra (spurious) spaces between the "<" and the tag name in the tomcat-user.xml file were causing the problem.

Wrong (failed as described):

<?xml version='1.0' encoding='utf-8'?>
<tomcat-users>
 <  role rolename="manager"/>
 <  user username="trainee" password="abc123" roles="manager"/>
</tomcat-users>


Right (working):

<?xml version='1.0' encoding='utf-8'?>
<tomcat-users>
 <role rolename="manager"/>
 <user username="trainee" password="abc123" roles="manager"/>
</tomcat-users>


Background: The tomcat-users.xml file provides one quick and easy way of providing a login capability to the Tomcat Manager application which allows you to see how your server is running 'on the fly', and to stop and start and deploy web applications individually rather than controlling them simply by stopping and starting the whole server!

Learn More: On our Deploying Apache Httpd and Tomcat course.
(written 2009-01-16)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
A654 - Web Application Deployment - Configuring and Controlling Tomcat
  [837] Tomcat - Shutdown port - (2006-08-18)
  [907] Browser -> httpd -> Tomcat -> MySQL. Restarting. - (2006-10-28)
  [914] A practical example of roles - (2006-11-04)
  [1351] Compressing web pages sent out from server. Is it worth it? - (2007-09-14)
  [1370] Apache Tomcat Performance Tuning - (2007-09-29)
  [1503] Web page (http) error status 405 - (2008-01-12)
  [1553] Automatic startup and shutdown of Tomcat - (2008-02-24)
  [1762] WEB-INF (Tomcat) and .htaccess (httpd) - (2008-08-20)
  [1943] Port and Glasses - (2008-12-14)
  [2039] The Invoker - (2009-02-13)
  [2061] Tomcat 6 - Annotated Sample Configuration Files - (2009-03-01)
  [2163] CATALINA_OPTS v JAVA_OPTS - What is the difference? - (2009-05-09)
  [2652] Reading and writing cookies in Java Servlets and JSPs - (2010-02-26)
  [3043] Gathering information - logging - with log4j. First steps. - (2010-11-12)


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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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