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2156 - Stopping forum spam - control of the signup process
On all the forums that I look after, I now run code so that everyone who wants to sign up has to pass a Captcha test where he / she is required to retype a word (that excludes automata), and even then there's a requirement for me or another administrator to accept the signup, based on information su ....

2155 - No subject or title?
There are times that I write a post here then - something of an afterthought - have to come up with a clever title ... Why should everything have a title, or a subject line? I came across this post on the First Great Western Coffee Shop - image by Chris from Nailsea, who has given me permission to ....

2154 - Bean Classes in Java and Java Database Connections
A class is a bean if it has a constructor that takes no parameters, and if it has methods that start with "get" to read properties, and "set" to set properties. And it's a good idea (!) if the letter after the word get or set is a capital, as this will let it be used within JSP tag libraries. B ....

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 ....

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