Monday, June 28, 2010

Java 4 Ever

This is a really funny video about Java!

Monday, June 21, 2010

Sonar (Code Quality Management System)

Sonar is an open system to manage code quality. It monitors the 7 axes of code quality:

  • Architecture & Design
  • Comments
  • Duplications
  • Coding rules
  • Unit tests
  • Potential bugs
  • Complexity

More info:

Wednesday, June 16, 2010

Setting response MIME-type in Java ServerFaces

To set the MIME-type in JSF, use the following code in your JSP-page:

<% response.setContentType("text/plain"); %>

In this example, the MIME-type is set to plain text. The browser will treat the page as plain text and will not render the page as a HTML-page.

Here is a list of common MIME-types.

Monday, June 14, 2010

Fixing ^M characters in VI

The new line in UNIX-like OS is represented differently than in Windows OS. When a Windows file is viewed in the VI editor, you can see ^M where the line ends. You can remove the ^M character by using the following VI regular expression command:


The ^-sign means holding the CTRL-key while pressing the next character.

Wednesday, June 9, 2010

Getting client information in Java ServerFaces

I always log client information in JSF applications in debug mode. I use the following code in a managed bean to retrieve the IP-address, hostname and HTTP-headers from the browser.

// Get the request-object.
HttpServletRequest request = (HttpServletRequest)

// Get the header attributes. Use them to retrieve the actual
// values.

// Get the IP-address of the client.

// Get the hostname of the client.