Everytime I load a heavy application such as Eclipse or Thunderbird, I see this annoying message which keeps repeating even if I press “Wait”.

"Eclipse" is not responding.
You may choose to wait a short while for it to continue or force the application to quit entirely.
[Force Quit] [Wait]

I tried to search for a solution and found that the question is unanswered in both Ubuntu forum as well as Fedora forum.

So I decide to figure out what code is making the popup window appear. It turns out that the function named delete_ping_timeout_func is called whenever a timeout happens. Code with exact line number is present here .

However I didn’t find any code which reads a timeout value from some configuration file. Is there a mechanism using which I can configure the delete window timeout value? Essentially I would like to make the timeout value to about 4 minutes.

As an aside, I see that metacity developers mailing list has not had any post since year 2011. So is it worth asking it on that mailing list?

OAuth2.0 supercedes OAuth1.0 protocol, specifically in making it simpler to use. It supports different workflows as described in its specification RFC-6749. The most concise pictorial representation I found is here.

I created a Play! 2.0 Application in Scala which supports server to server token exchange using OAuth2.0 Protocol. You can find the project source code on GitHub at play-oauth2-server. Its a complete working server codebase, with:

  • Basic User login
  • Client registration with Callback URL
  • Auth Code generation
  • Authentication Token and Refresh Token generation

This application also demonstrates the following:

  • Twitter Bootstrap library using WebJars
  • Typesafe Slick 2 library for database access
  • Scoverage for Scala code coverage
  • and Specification Tests

To play with it, folow project README document. Please report any issues here.

This post is about the talk I was supposed to give at Ruby Camp 2014, Delhi/NCR. After all the preparation, slides and code I missed it. Unfortunately, I fell sick overnight and I couldn’t make it. Apologies for that.

The best I could do is upload all the material online on GitHub and my website.

  • the code is on GitHub at this repository: tuxdna/rubyml.
  • the generated slides are also online here

Thats all!

Lets say you have a bunch of source code files in a project. Whenever you change them, you want some HTML to be generated. After that you go to browser to see how the change looks now. Here is the workflow:

  • Step 1: Change file(s)
  • Step 2: Run a build script to generate HTML
  • Step 3: Open / Reload the page in browser

Well we can automate all the three steps into one using a couple of tools and some scripting magic. We will need a inotify-tools, NetCat nc tool and MozRepl.

Install inotify tools and netcat:

sudo yum install -y inotify-tools nc6

Install MozRepl as described here: Refresh Firefox page from Emacs

Make sure that you have started MozRepl by restarting Firefox. Then Alt+T then Select MozRepl then Start.

Now create a simple script to watch for changes like so:

while inotifywait -r -e modify src/
  # put your command here to generate the html from modified files

  # now refresh the browser
  echo "BrowserReload();" | nc localhost 4242  > /dev/null

Keep this script running while you make changes to the source code. You can also automate this with other build tools ( such as Maven, SBT etc. ) and editors ( such as Emacs )


I was using Chromium Browser on Linux, to see World Cup 2014 videos on YouTube. Some videos were not available in my region because of restrictions by region. If you are also seeng the same message, the you may want to setup a SOCKS proxy, and use that to bypass the YouTube restriction. For this to work, you need an SSH server what is located in some region from where you can access such videos.

Setup Socks v5 proxy:

ssh -CND 1080 user@some-ssh-server.example.net

Start Chromium browser with this proxy by default:

$ chromium-browser --proxy-server="socks5://localhost:1080" --host-resolver-rules="MAP * , EXCLUDE localhost"
ATTENTION: default value of option force_s3tc_enable overridden by environment.

Now you can watch those restricted by region videos.



Download the Scala IDE from here, unzip it at ~/software/scala-eclipse, such that the contents look as follows:

$ pwd
$ ls
artifacts.xml  configuration  eclipse  eclipse.ini  epl-v10.html  features  icon.xpm  META-INF  notice.html  p2  plugins  readme

Create a launcher script for Scala IDE /bin/scala-ide, and make it executable:

$ cat /bin/scala-ide
$ chmod +x /bin/scala-ide

Configure launcher icon ~/.local/share/applications/scala-ide.desktop. You can copy a config file from /usr/share/applications/ directory and make changes as follows:

$ cat ~/.local/share/applications/scala-ide.desktop
[Desktop Entry]
Name=Scala IDE
GenericName=Scala IDE
Comment=View and edit files
Exec=/bin/scala-ide %F
# StartupWMClass=

Now you can invoke scala-ide from shell ( command line ) or via desktop search (Alt+F2).


This post is coming after a long time. Apologies for that.

Alright, this one is for the fans of Apache Mahout and Scala programming language. I had given a talk on Machine Learning with Apache Mahout and Scala ( slides ) at OSDConf.in. The code examples are present on GitHub at this repo.

I attended BootConf 2014 today.

The day began with Arduino for Robotics by Naveen Kumar. It was such a wonderful 1 hour session, purely demo based, and very interactive. Second talk was Varnish Caching Server by Vivek Gupta. Vivek explanined how a caching server fits in a clustered environment and what all things that we can do with Varnish.

Next was my talk Introduction to Scala. You can find the slides here, and all the code for demo at this GitHub repository.

Finally, the last session was Open Stack by Sajid Akhtar. Sajid showed a high-level overview of how OpenStack is made, what the opportunities are, and how the contributers from around the globe make OpenStack an awesome project. OpenStack is the most popular Free and Open Source cloud provisioning and management system.

I had to leave early so I could not completely attend this last session. I also missed the Open House session, which I will catch up with tomorrow.

More details follow:

UNIX and heavy duty printing

This weekend I had to ensure that the posters get done within two days. The challenge was that on Monday it was Holi ( the festival of colors ), so naturally no designing and printing available on Monday. Thankfully my friend was there for all the professional help, all the way from designing till printing.

Here in the pic is Saleem Ahamed standing besides the posters, who helped with all the designing and priting of BootConf 2014 posters. Applaud for him :-).

These machines grabbed my attention as desktop looked quite similar to GNOME Desktop. I suspected that these could be Sun Workstations. I actually did get the permission to type in uname -a on a terminal of these machines :-). What was stunning for me, was to see SunOS in the output and also GNOME desktop. UNIX does power the Digital Printing business on the Heavy Duty Printers ( from XEROX ). Interesting indeed.

Are there any Linux based workstations for heavy duty printing machines ?

Finally, here is the result of the hardwork: BootConf 2014 poster