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2153 - Class Loading and Variable Conversion in Java
"Where did you get THAT from?" Ever heard that question? I've asked it of Java sometimes, in wondering where a Java virtual machine has found a class from ... and it's not always obvious. When loading a class, Java looks at each location given in the CLASSPATH in turn ... and if there are impo ....

2152 - My four feet!
OK - there has been quite a number of technical entries here tonight as I've been writing up some different diagrams I used during the course for these last days. So I thought I would make my last post of the day to show you my four feet ... and least I think they're mine. I recognize two of the ....

2151 - What is a JSP tag library?
Java programming is very different to writing HTML - web page authors expect a tag based language ... so why not provide one that provides some Java functionality? That's what tag libraries do. My slide shows a piece of Java program - defining a variable and calling a constructor; it's a pretty ....

2150 - Routers, Firewalls and multilayer servers
We only have one IP address at Well House Manor, but lots of computers. How does that work? Internally, all our machines are on 192.168.200.xxx network but the router re-writes those to our single IP address on output, and for traffic where the client is at our place (that's most traffic such as ....

2149 - Routing Network Traffic - Proxies, Redirects and DNS
If you point a domain at web server "X" when it's really hosted on web server "Y", you can either have web server "X" forward the request as a proxy, or you can have server "X" instruct the browser to try "Y" instead ... that's a redirect. Which is best? A proxy forward hides server "Y" from the ....

2148 - Variable scope in Java Servlets and other web applications
How long does a variable last? When you set a variable in a Java Servlet (a Java programming that's running on a web server in a container such as Tomcat), the variable may ... • be local to the block of code it's in, and be lost when that block has been completed • be present only for t ....

2147 - A very easy JSP (Java Server Page)
"Can you give me an easy first example" ... a common question on a course and - yes, I usually can. And so can other tutors. But then they go on and add things to make them complicated. So here is a really easy JSP example! JSP is what I call an "HTML++ language" ... you write the HTML of the w ....

2146 - An evening excursion to Devizes and Avebury
It's the time of year when days are longer ... and after a training course, delegates (sometimes with the tutor acting as tour guide) gat a chance to see a little of Wiltshire. Midweek, early evening ... and places are quiet but the scenes and scenery remain magnificent. As well as delegates on co ....

2145 - Using the internet to remotely check for power failure at home (PHP)
Do you have freezers and other electrical equipment at home and worry about whether they'll be all right while you're away on holiday? Do you have a broadband connection with a rarely changing IP address, and a web site that you host with a web space provider? Then you'll be able to set up a "hear ....

2144 - Looking for a career change - Physician to Web Site Designer
A change of career mid-life has always been popular, and something more sedentary has often been the choice of people who have started off in something that's predominantly active such the military or sport. I have trained an Olympic Judo Champion ... in programming. And with the current economic ch ....

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