How to install Apache Tomcat Server on Ubuntu

Here is the simplest way to install Tomcat 7 on Linux Ubuntu 14.04

Execute these commands from terminal

sudo apt-get update
sudo apt-get install tomcat7

Try run:
sudo /usr/share/tomcat7/bin/startup.sh 

If you've got an error do this:
sudo dpkg-reconfigure tomcat7

Can't run Tomcat from Intellij Idea?

cd /usr/share/tomcat7 

ln -s /etc/tomcat7 conf 

chmod -R 655 /etc/tomcat7/

Link on idea 14 keygen code

http://www.rover12421.com/2014/11/01/jetbrains-intellij-idea-14-keygen-java-source-code.html

Good site to learn English grammar (link)

http://www.edufind.com

your current network has a .local domain which is not recommended and incompatible with the avahi

http://askubuntu.com/questions/339702/network-service-discovery-disabled-what-does-this-mean-for-me

It looks like avahi-daemon is started when the network connection is established (/etc/network/if-up.d/avahi-daemon). This notification is informing you that mDNS (Avahi) has been disabled. It's only used for a small number of applications that only work on the local network, it won't adversely affect your internet connection or DNS.
The most well known use for mDNS is sharing music with Rhythmbox (or iTunes) over your LAN. It's an Apple technology, but it's largely been ignored in favour of uPNP or DLNA.
To disable it, you must edit the file /etc/default/avahi-daemon as root:

sudo -i
gedit /etc/default/avahi-daemon

and add this line (or change it if already exists to):

AVAHI_DAEMON_DETECT_LOCAL=0 

Source: http://ubuntuforums.org/showthread.php?t=1632952 

How to resolve issues during the install of Skype 4.3.0 .37 on Linux Ubuntu 14.04

I could successfully resolve issues during the installing of Skype 4.3.0.37 on Linux Ubuntu 14.04 by these two commands:

sudo apt-get upgrade --fix-missing
sudo apt-get -f install

Check this link about this solution.

SQL joins visualy explained

Great explanation / tutorial of Concurrency in Java (link)

http://tutorials.jenkov.com/java-concurrency

Collect data for the next job interview

Write down what you worked on, what your role was, what the challenges were, things that went wrong, successes that you had. These are all questions that are asked in interviews and you will be glad that you got a jump on crafting these stories and are able to recall critical details.

Taken from here https://www.linkedin.com/pulse/article/20141017142526-5336185-even-if-you-re-employed-7-steps-to-take-now?midToken=AQEENZ3q5Ct1zQ&trk=eml-b2_content_ecosystem_digest-recommended_articles-179-null&fromEmail=fromEmail&ut=30VXzahYK5Ems1

Link on good tool for sharpening regexp skills

http://www.regexr.com

Link on Algorithms lessons resources (in RUS)

http://oim.asu.kpi.ua/courses/theory-of-algorithms/