Skip to main content

Error handling and Production

When you are developing a customer front web application, you should take every measure to hide technical details from the user. This is especially true for JEE applications. Not only because the user is pissed off looking at a huge stack trace but also it reveals a lot. Look at the following figure


This famous shopping site has been developed to show stack trace on the web page. The developer cleverly hid the trace when the page loads up. But leaves a link that uses DHTML to show the hidden div. That kinda defeats the whole purpose. If the user sees this link, he is less likely NOT to click it.

If you really want to have a handle on this. Print out a unique token (a timestamp, md5 hash or something - get creative here), and correspondingly log it in your appserver along with stack trace. Have the user (customer or your pain-in-the-neck-QA guy) email you that token. Now you can grep that log for it.

Now, you know, I have less confidence in that site this day forward.

Popular posts from this blog

Javascript: Convert Strings to Binary (and representing in a nerdy way!)

I follow those GoogleDevelopers Videos. Sometime back, in one of the presentations on GoogleIO, there was this interesting string of dots at the bottom of each page of the presentation. They looked like random big and small dots. A similar bunch of dots were also on the T-shirt of a presenter was wearing in another presentation. While it seemed something in the pattern, I could not find what it was. Finally, another presenter cleared the matter that those dots are just binary representation of "GOOGLEIO" (So much for advertizing Google IO, Impressive!).

So I wanna do it. Takes me back to days of those DSP classes at school. Nerdy me had to churn some old brain cells. I remember those first programming language classes in Pascal and C when you were asked to do fibonacci series and converting a binary string to ascii codes. That *experience* came handy here: Check it out!

Text to Binarize:
For those who came to copy the javascript code to convert string to binary, Here it is…

Add jquery in Chrome console

Many a time, a page you are debugging doesnot have jquery. This simple js will add(or prompt you to overwrite) jquery to any page from chrome console.

javascript:if(!window.jQuery||confirm('Overwrite\x20current\x20version?\x20v'+jQuery.fn.jquery))(function(d,s){s=d.createElement('script');s.src='https://ajax.googleapis.com/ajax/libs/jquery/1.8/jquery.js';(d.head||d.documentElement).appendChild(s)})(document);

The easiest way to install docker on Ubuntu

Docker releases come out faster than ubuntu updating thier repositories. Docker mainitains a ppa. One can add the ppa key, and then add to sources.list.d and then update sources and then install lxc-docker. OR..
curl -sSL https://get.docker.com/ubuntu/ | sudo sh