Calvin Codes

Understanding JSON Web Tokens (JWT)

Introduction

DoS your local | fork() Bomb

What is DoS?

Velocity could not be initialised! But why?

Hi Guys! I (not very) recently used velocity template engine and came across one of the common issues faced by developers while using the same.

Velocity — Basics & Issue!

Updating encryption key of a secret in AWS Secrets Manager gone wrong

Hacking SPR-9989: Multiple PropertyplaceHolderConfigurer with default values

Multiple property place holder configurators in spring application context, is going to (with a probability of 0.99) screw up all property values having default value (${placeHolder:defaultValue})…

Hibernate EntityManager | merge() v/s persist() [Part 1]

Hibernate’s entity manager merge and persist provide two different functionalities all together. While persist can make a transient object persistent, merge on the other hand makes a copy of the object passed to it and makes this…