Java

Imagine you have this piece of text:

I am stupid\

And what to change it to

I am stupid\\

so that it may be saved correctly to the database (assume you are not using prepared statements). A first attempt might be:

new String(Base64Coder.decode(pFieldData)).replaceAll("\\","\\\\");

because you are clever and know about escaping a single \ with another one \\ to produce a \.  Sadly that will not work.  The \\ expands to one \, and that is one part of the \\ you need for the regular expression.  This is what you need to do - insane:

I have developed an application in JBoss Seam 2.2.1.Final using RichFaces 3.3.3.Final.  Some parts of the code make heavy use of a4j calls, i.e. Ajax calls.  This works very well under most browsers.  Unfortunately when IE9 was released two weeks ago, it refused to work with my application.  I would click on certain links and nothing would happen.  Or I'd get blank pages back.

Eventually I traced the issue to a known bug in the Sarissa.js file that is used by RichFaces for XML and DOM parsing.  This file in RichFaces 3.3.3.Final is not compatible with IE9.

Recently I had to make my JBoss Seam web application support both English and Georgian.  Naturally their character set is not to be found in ASCII, so I had to rely on JBoss Seam and Java's support for UTF-8.

I guess there would be three groups of Java developers out there - those who know about exceptions but have never heard of checked and unchecked exceptions, those who know what it is but do not understand them and those who truly know and understand them. My educated guess is that most people fall in the former two categories. This article will try and explain the differences between the two kinds of exceptions, as well as when to use which.