Good manager

Jonathan Mills teaches the top attributes of a good manager, showing 10 techniques on how to improve the productivity and satisfaction of a team’s members.
http://www.infoq.com/presentations/managing-developers-10-techniques

Mongo sparse index

An index that is both sparse and unique prevents collection from having documents with duplicate values for a field but allows multiple documents that omit the key.
Read more here: http://docs.mongodb.org/manual/core/index-sparse/

Spring framework Code Style

See it here: https://github.com/spring-projects/spring-framework/wiki/Spring-Framework-Code-Style

Changes in Java Specification between Java 7 and 8 - highlighted in the document

http://docs.oracle.com/javase/specs/jls/se8/jls8-diffs.pdf

How to switch between oracle java 7 and 8 on ubuntu

sudo update-java-alternatives -s java-7-oracle
sudo update-java-alternatives -s java-7-oracle

Read more here: http://www.webupd8.org/2012/09/install-oracle-java-8-in-ubuntu-via-ppa.html

Copy & Paste in ubuntu terminal

For Copy use Ctrl + Shift + C
For Paste use Ctrl + Shift + V

Secure Random Generation in Java 8

Java has been under fire for several years for having security holes. Justified or not, a lot of work has been done to fortify the JVM and frameworks from possible attacks. Random numbers with a low-level of entropy make systems that use random number generators to create encryption keys or hash sensitive information more susceptible to hacking.

So far selection of the Random Number Generation algorithms has been left to the developer. The problem is that where implementations depend on specific hardware / OS / JVM, the desired algorithm may not be available. In such cases applications have a tendency to default to weaker generators, which can put them at greater risk of attack.

Java 8 has added a new method called SecureRandom.getInstanceStrong() whose aim is to have the JVM choose a secure provider for you. If you’re writing code without complete control of the OS / hardware / JVM on which it would run (which is very common when deploying to the cloud or PaaS), my suggestion is to give this approach some serious consideration.
See more here: http://www.infoq.com/articles/Java-8-Quiet-Features

Google published Java code style

Google published Java code style: http://google-styleguide.googlecode.com/svn/trunk/javaguide.html

Efficient Indexing in MongoDB 2.6

Important change in indexing in Mongo 2.6:

• Using many indexes on one query from now. You do not need to create compound indexes for every query. MongoDB limits you to 64 indexes per collection!

Read more here: http://blog.mongodb.org/post/87790974798/efficient-indexing-in-mongodb-2-6