tomcat-users.xml; what a difference a space made

For 2023 - we are now fully retired from IT training.
We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.

Lisa and I (Graham) now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active!

I am also active in many other area and still look after a lot of web sites - you can find an index ((here))

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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Text on a background image
Travelling to a course - station pickups
Advise before my Apache / Tomcat course
Automated server heartbeat and health check
tomcat-users.xml; what a difference a space made
Load Balancing - Hardware or Software?
A good time to travel
Rules for a King
Speaking all the languages
So sad to see you go

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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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