🔖 2023-06-06 :: Microservice Architecture Patterns

🔖 2023-03-30 :: Spring Boot Startup Report

🔖 2023-02-14 :: Should That Be a Microservice?

🔖 2023-01-11 :: Best of July-December 2022

🔖 2022-10-14 :: Kubernetes Kubectl Commands Cheat Sheet

🔖 2022-09-29 :: Project Demonstrating Observability For Java Spring Applications

🔖 2022-09-09 :: Java Keywords Cheat Sheet

🔖 2022-08-16 :: Top 10 Java Language Features

🔖 2022-07-19 :: maven-survival-guide

🔖 2022-06-10 :: OWASP Top Ten

🔖 2022-06-10 :: 2019 CWE Top 25 Most Dangerous Software Errors

🔖 2022-06-10 :: Secure Coding Guidelines for Java SE

🔖 2022-05-26 :: How Do Programmers Ask the Interviewer Questions in an Interview

🔖 2022-05-13 :: Online diagramming for teams

🔖 2022-04-20 :: Know the Difference Between JVM, JRE, And JDK

🔖 2022-04-15 :: Recommended parameters for Java Containerized Application

🔖 2022-04-12 :: Adoptium Eclipse Temurin

🔖 2022-04-08 :: Spring Boot REST API Specs

Generating Open API specs for a spring project is an easy few step process:

1. Add maven dependency

   <dependency>

     <groupId>org.springdoc</groupId>

     <artifactId>springdoc-openapi-ui</artifactId>

     <version>1.6.7</version>

   </dependency>

2. Start the application

3. Get specs at http(s)://server:port/<context-path>/v3/api-docs

4. Get specs ui at http(s)://server:port/<context-path>/swagger-ui.html

🔖 2022-04-06 :: Major migrations made easy with OpenRewrite

🔖 2022-03-22 :: JVM Memory Architecture and GC Algorithm Basics

🔖 2022-03-21 :: JVM in Linux containers, surviving the isolation

🔖 2022-03-18 :: Install/Run Docker on Windows 10

1. Start Windows PowerShell via Run as administrator

2. Execute below commands one by one

  > wsl --install

  > wsl --set-default-version 2

  > wsl --update

3. Start Microsoft Store and install Debian

4. Start Debian and create user dockerce/dockerce

5. Execute below commands one by one

  $ sudo apt update

  $ sudo apt dist-upgrade

  $ sudo apt install docker.io

  $ sudo touch /etc/fstab

  $ sudo update-alternatives --set iptables /usr/sbin/iptables-legacy

  $ sudo update-alternatives --set ip6tables /usr/sbin/ip6tables-legacy

  $ sudo service docker start

6. Test installation by running hello-world docker image

  $ sudo docker run hello-world

🔖 2022-03-15 :: Refactoring

Refactoring is a systematic process of improving code without creating new functionality that can transform a mess into clean code and simple design.

🔖 2022-03-15 :: Design Patterns

Design patterns are typical solutions to common problems in software design. Each pattern is like a blueprint that you can customize to solve a particular design problem in your code.

🔖 2022-03-07 :: Awesome Software Architecture

Curated list of awesome articles and resources to learn and practice about software architecture, patterns and principles. this repository will be updated continuously, keep yourself up to date.

🔖 2022-03-07 :: Encoding, Encryption, and Hashing

🔖 2022-03-04 :: The 2022 Java Programmer RoadMap [UPDATED]

🔖 2022-01-07 :: Hibernate Performance Tuning Tips – 2022 Edition

🔖 2021-12-20 :: Performance Testing with JMeter

🔖 2021-12-17 :: The Best Spring Data JPA Logging Configuration in Spring Boot

🔖 2021-12-06 :: SIMPLE THINGS THAT ARE ACTUALLY HARD: USER AUTHENTICATION

🔖 2021-11-17 :: 5 Git Best Practices

🔖 2021-11-15 :: Spring Boot Microservices Coding Style Guidelines and Best Practices

🔖 2021-11-04 :: A Guide to Spring's Open Session In View

🔖 2021-10-28 :: The Missing README: A Guide for the New Software Engineer

Do you remember the definition of a software developer? "You create value by solving problems with code". This is how you make an impact, by solving problems. Too often I find myself coding to solve imaginary problems, creating no value. Don't be like me ...

🔖 2021-10-22 :: Top Java Development Skills in Demand Right Now

🔖 2021-10-21 :: OWASP Secure Coding Practices-Quick Reference Guide

🔖 2021-10-16 :: The Five Whys Analysis

The Five Whys Analysis is a popular root cause investigation technique with a simple premise that is asking why five times can yield the answer, which is the root cause. While doing so could be a helpful exercise, blindly applying the technique often leads to a suboptimal result...

🔖 2021-10-15 :: Awesome Java

🔖 2021-10-11 :: Profiling and Fixing Common Performance Bottlenecks

🔖 2021-09-29 :: Spring @Transactional Mistakes Everyone Makes

🔖 2021-09-27 :: 6 Tips To Start Coding Faster and Better

🔖 2021-08-25 :: Migrate to JUnit 5 from JUnit 4

🔖 2021-08-24 :: 5 Hibernate Features You Should Use With Spring Data JPA

🔖 2021-08-24 :: 5 Hibernate Features You Should Use With Spring Data JPA

🔖 2021-07-29 :: The Programmer's Oath (18 November 2015)

1. I will not produce harmful code.

2. The code that I produce will always be my best work. I will not knowingly allow code that is defective either in behavior or structure to accumulate.

3. I will produce, with each release, a quick, sure, and repeatable proof that every element of the code works as it should.

4. I will make frequent, small, releases so that I do not impede the progress of others.

5. I will fearlessly and relentlessly improve my creations at every opportunity. I will never degrade them.

6. I will do all that I can to keep the productivity of myself, and others, as high as possible. I will do nothing that decreases that productivity.

7. I will continuously ensure that others can cover for me, and that I can cover for them.

8. I will produce estimates that are honest both in magnitude and precision. I will not make promises without certainty.

9. I will never stop learning and improving my craft.

🔖 2021-02-24 :: From Monolith to Microservices – Migrating a Persistence Layer

🔖 2021-01-22 :: What is end-to-end encryption and why it's such a confusing term

🔖 2021-01-06 :: Spring Boot Best Practices for Microservices

🔖 2020-10-23 :: Spring Security: Delegating authorization checks to bean methods

🔖 2020-10-21 :: Java Exception Handling Examples in Open Source Projects

🔖 2020-10-08 :: A categorized list of all Java and JVM features since JDK 8 to 17

🔖 2020-09-29 :: A Picture of Java in 2020

🔖 2020-08-11 :: Top 50 Java Collections Interview Questions

What is the Java Collection Framework and How do you choose different collections? Here is the diagram which answers this question:

🔖 2020-07-22 :: How Fast is Spring?

🔖 2020-07-21 :: On Open Source, licenses and changes

What qualifies as Open Source? How to decide that what licenses are considered Open Source?

🔖 2020-07-02 :: USING MULTIPLE DYNAMIC CACHES WITH SPRING

🔖 2020-06-16 :: Distributed Cache with Hazelcast and Spring

🔖 2020-05-09 :: JDBC - a short guide

🔖 2020-05-08 :: Managing Transactions with Spring and Spring Data JPA

🔖 2020-04-14 :: The System Design Primer

🔖 2020-04-13 :: Top 5 Skills and Topics to Crack Tech Coding Interviews in 2022 [UPDATED]

🔖 2020-04-09 :: AM I A REAL EXPERT?

🔖 2020-03-31 :: RESTful API Designing guidelines — The best practices

🔖 2020-03-18 :: Optical Character Recognition with Tesseract (Tess4J)

🔖 2020-02-26 :: Top 50 Java Programs from Coding Interviews

🔖 2020-02-04 :: Karate - Test Automation Made Simple.

🔖 2019-10-18 :: Add Real-time to your Java App with Azure SignalR Service

🔖 2019-10-14 :: Logging levels: the wrong abstraction | IG Labs

DEBUG

  - information that is useful during development. Usually very chatty, and will not show in production.

INFO

  - information you will need to analyze production issues.

WARN

  - someone in the team will have to investigate what happened, but it can wait until tomorrow.

ERROR

  - Oh-oh, call the fireman! This needs to be investigated now!

🔖 2019-09-23 :: Twelve-Factor Methodology in a Spring Boot Microservice

🔖 2019-08-20 :: Micrometer: Spring Boot 2's new application metrics collector

🔖 2019-07-03 :: Anti-Patterns and Code Smells

🔖 2019-05-20 :: Difference Between a Java Keystore and a Truststore

🔖 2019-04-29 :: Which Log Level to use When !!!

FATAL

  - should be reserved for errors that cause the application to crash or fail to start (ex: JVM out of memory)

ERROR

  - should contain technical issues that need to be resolved for proper functioning of the system (ex: couldn’t connect to database)

WARN

  - is best used for temporary problems or unexpected behavior that does not significantly hamper the functioning of the application (ex: failed user login)

INFO

  - should contain messages that describe what is happening in the application (ex: user registered, order placed)

DEBUG

  - is intended for messages that could be useful in debugging an issue (ex: method execution started)

TRACE

  - is similar to DEBUG but contains more detailed events (ex: data model updated)

🔖 2019-04-03 :: Software Project Review Checklist

🔖 2019-04-02 :: Focus on Integration Tests Instead of Mock-Based Tests

🔖 2019-02-19 :: SEI CERT Oracle Coding Standard for Java

🔖 2019-01-29 :: Introducing Jib — build Java Docker images better

🔖 2019-01-18 :: OWASP Top Ten related Cheat Sheets

🔖 2019-01-17 :: Top 10 Web Application Security Risks

🔖 2018-05-04 :: The State of Java in 2018

🔖 2018-04-19 :: Spring checkstyle formatting

🔖 2018-03-26 :: Java VM Options You Should Always Use in Production