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Lambda expression in Java
How are lambda function done in Java Because Java likes everything to be under a class or an int...
Import packages / modules
I have a helper file that I would like to use within the same project. If say your directory lay...
Packages vs Modules
Preliminary Forget about the packages and modules that you know from Python, it is no related, y...
Bash Cheatsheet
Multi-line Command To execute multi-line command in bash script simple put a \ after breaking up...
Vim Cheatsheet
Mandatory get out of Vim joke Ughhh how do I escape Vim? # <ESC> :wq, write the changes to the ...
Compressed file vs Archived file
Archived file An archived file is basically a collection of files and directories stored into on...
How does inner, left, right, full join work?
When and what is a JOIN? Querying data in your database from only one table can only get you so ...
Little and Big Endian
Endianness Little and big endian are two ways of storing multibyte data-types into memory. For s...
Unpacking operator in code and function header
Unpacking In Python you are allowed to do deconstruction similar to how you can do deconstructio...
More about OAuth2.0 grant
What is a grant? When you sent a request to the authorization server you will sent a field that ...
tr and cut command
tr The tr command is used to translate or delete characters that comes from the standard input. ...
Global variables with imports
Sharing global variables between modules If for whatever reason you need to share global variabl...
Apache Kafka Introduction
What is Kafka? Kafka is a data streaming platform, just like Amazon Kinesis it is able to take i...
Optional in Java
Optional Optional is an object that can be think of as a container to hold other objects. It can...
When does a merge conflict happen?
What is merge conflict Merge conflict arises when you have two people changing the same line in ...
Mockito how does it work?
Background So what is Mockito? It is framework that is used on top of testing framework library ...
Checked vs Unchecked Exception
Exceptions In Java exceptions (which differs from the C exception) there are two types of except...
Public and Private key encryption/decryption
Cryptography 101 Asymmetric key encryption is key to many things, especially for TLS handshake i...
Spring boot application.properties
In a application.properties file you can use place holders to reference environment variables rat...
Spring boot command line arguments with Maven
Running application with Maven To run your application with Maven you just run the following com...