why static factory methods over traditional constructors

https://jlordiales.me/2012/12/26/static-factory-methods-vs-traditional-constructors/

Generating and customizing Embedded twitter timeline

Generate Timeline widget

https://publish.twitter.com/#

Customize timeline widget

https://dev.twitter.com/web/embedded-timelines/parameters

difference between DTO, POJO, javabeans

http://stackoverflow.com/questions/1612334/difference-between-dto-vo-pojo-javabeans

see hidden files on mac book

 CMD + SHIFT + . 

more a user has invested in a product, less likely zhe is to leave

https://www.coursehero.com/file/p2roel/The-more-a-user-has-invested-in-a-product-the-less-likely-he-or-she-is-to-leave/

create a sudo user

https://www.digitalocean.com/community/tutorials/how-to-create-a-sudo-user-on-ubuntu-quickstart

usermod -aG sudo username

Regex DoS

https://www.owasp.org/index.php/Regular_expression_Denial_of_Service_-_ReDoS

Evolution of java from early web development days to Web Framework Spring

This is more of a dump of the reading material I went through alongwith my scribbled notes to understand how we development evolved in the Java ecosystem.

In the start there was darkness

Only HTML pages exist

then came the requirement to generate them dynamically - (server side generation of HTML started)

That's when SERVLETs came into picture - HTML code in Java

Servlets were processed by a web server container like Tomcat

It soon became unmanageable.

JSP came for the rescue. - Java code in HTML - 

To reduce the amount of boilerplate java code in JSP, its language evolved. More complex constructs arrived

Standard Action - One level object hierarchy supported - attributes embedded within an object attribute of a bigger object wasn't accessible

Expression Language - Multi-level hierarchy supported - Iteration over collections wasn't possible

Tag Library - Looping over collections made possible - handled 99% of usecases

Custom Tags - for the remaining 1% of the requirements, developers were allowed to define their own custom tags

Bean - any simple class with setters and getters.

Not really. There is more to being a bean than just having accessors/mutators. Please refer to the JavaBean specification.

Servlet - A class inherited from HttpServlet which receives the http requests and generate the response of forward the request to another servlet or jsp page.

No, servlets need not extend HttpServlet. They need only implement javax.servlet.Servlet. HttpServlet is only one implementation of a servlet.

EJB - a class(object) which exists on a j2ee server and can be accessed remote(from another JVM).

The term "J2EE server" is ambiguous; more specifically, Enterpise Java Beans (EJBs) are reusable, distributed software components that are executed within an EJB container.

In page-driven applications, each page not only contains the business logic required to generate the dynamic content, but also the control logic to determine application flow. Control logic became difficult to maintain because there was no central location or design paradigm to help you understand how a user passed from one page to the next. And as business requirements evolved to include features like authentication and authorization, page code became convoluted with additional logic that usually had to be duplicated across pages, even if it was irrelevant to the page being constructed. On a site with 1,000 pages, all with authorization mechanisms, who wants to update all 1,000 pages when those authorization mechanisms change?

The arrival of MVC architecture - Understanding 101

http://www.javaworld.com/article/2076557/java-web-development/understanding-javaserver-pages-model-2-architecture.html

The core business value in adopting Spring is the separation between code and configuration, which leads to a more manageable application.

Webserver comes bundled up with Spring ()

you can choose Jetty / Tomcat

Source:

The evolution of Servlets and JSP

Jetty vs Tomcat Performance Comparison

Forum question on servlet beans - not authoritative but gives pointers

How Spring sprang up and was different from earlier ways of doing things

Understanding Java version releases - http://www.tecmint.com/what-is-java-a-brief-history-about-java/

How and when IBM entered the Java scene - the internationalisation angle

- http://www.icu-project.org/docs/papers/history_of_java_internationalization.html

- https://www.ibm.com/developerworks/rational/library/nov05/cernosek/

--

Rahul Gupta

maximum safe length of a first name

http://www.raycon.com.au/articles.php?n=mrxjh0nj

software is eating the world? really?

https://www.wsj.com/articles/SB10001424053111903480904576512250915629460

Why can't I send UDP packets from a browser

http://new.gafferongames.com/post/why_cant_i_send_udp_packets_from_a_browser/

Quick Tip: Beautify Code in IntelliJ IDEA IDE

On Apple Mac machine: ALT + COMMAND + L

Garbage Collection in Javascript

What Wiki Says

https://en.wikipedia.org/wiki/Garbage_collection_(computer_science)

StackOverflow (SO) says

http://stackoverflow.com/questions/864516/what-is-javascript-garbage-collection

A reliable source of information on garbage collection in Javascript
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Memory_Management#Garbage_collection

Understanding how a memory leak can happen in javascript

https://auth0.com/blog/four-types-of-leaks-in-your-javascript-code-and-how-to-get-rid-of-them/

Insight with example on how to debug a memory leak

http://www.dwmkerr.com/fixing-memory-leaks-in-angularjs-applications

Note: Garbage Collection is different from Automatic Reference Counting. From the name, it may look like a variant of reference counting used as a technique in Garbage Collection

Git Submodule

https://github.com/blog/2104-working-with-submodules

https://git-scm.com/book/en/v2/Git-Tools-Submodules