Javier Dev

//== Developer

[Javier Dev @7_jram]

@Jairomartinez87 Solía pasar al del constitución o al de la Avenida España cada que iba a San Salvador, qué lástima ya no estarán.

[Elorm Daniel @elormkdaniel]

LINUX FILE SYSTEM FOR CYBERSECURITY PROFESSIONALS

[TRÄW🤟 @thatstraw]

Linux A-Z commands

[Dhanian 🗯️ @e_opore]

Modern Java Roadmap.

Java Foundations & Core Concepts
├── Java Fundamentals
│ ├── JVM Architecture & Bytecode
│ ├── Data Types & Variables
│ ├── Operators & Control Flow
│ ├── Methods & Scope
│ └── Memory Management (Heap vs Stack)
├── Object-Oriented Programming
│ ├── Classes & Objects
│ ├── Inheritance & Polymorphism
│ ├── Encapsulation & Abstraction
│ ├── Interfaces & Abstract Classes
│ └── Design Patterns (Singleton, Factory, Builder)
└── Advanced Language Features
├── Generics & Type Erasure
├── Annotations & Reflection
├── Lambda Expressions
├── Method References
└── Records & Sealed Classes

Modern Java Development (Java 8-21+)
├── Functional Programming
│ ├── Stream API
│ ├── Optional Class
│ ├── Functional Interfaces
│ ├── Collectors & Reduction
│ └── Parallel Streams
├── Concurrency & Multithreading
│ ├── Thread Management
│ ├ Executor Framework
│ ├── CompletableFuture
│ ├── Synchronization & Locks
│ └── Concurrent Collections
└── Performance Optimization
├── JIT Compilation
├── Garbage Collection Tuning
├── JVM Performance Monitoring
├── Microbenchmarking (JMH)
├── Project Loom (Virtual Threads)

Enterprise Java & Frameworks
├── Spring Framework Ecosystem
│ ├── Spring Boot
│ ├── Spring MVC
│ ├── Spring Data
│ ├── Spring Security
│ └── Spring Cloud
├── Jakarta EE (formerly Java EE)
│ ├── JAX-RS (RESTful Web Services)
│ ├── CDI (Contexts and Dependency Injection)
│ ├── JPA (Java Persistence API)
│ ├── Bean Validation
│ └── MicroProfile
└── Alternative Frameworks
├── Micronaut
├── Quarkus
├── Vert.x
├── Play Framework
└── Framework Comparison & Selection

Microservices & Cloud-Native Development
├── Microservices Architecture
│ ├── Service Decomposition
│ ├── API Gateway Pattern
│ ├── Service Discovery
│ ├── Configuration Management
│ └── Distributed Tracing
├── Cloud Integration
│ ├── AWS SDK for Java
│ ├── Azure Java SDK
│ ├── Google Cloud Java Client
│ ├── Serverless Java (AWS Lambda)
│ └── Containerization (Docker & Kubernetes)
└── Communication Patterns
├── REST APIs
├── gRPC
├── Message Brokers (Kafka, RabbitMQ)
├── WebSocket
├── Event-Driven Architecture

Data Persistence & Database Integration
├── SQL Databases
│ ├── JDBC
│ ├── JPA & Hibernate
│ ├── Spring Data JPA
│ ├── Connection Pooling (HikariCP)
│ └── Transaction Management
├── NoSQL Databases
│ ├── MongoDB
│ ├── Redis
│ ├── Cassandra
│ ├── Elasticsearch
│ └── Spring Data NoSQL
└── Database Migration & Tools
├── Flyway
├── Liquibase
├── Query Optimization
├── Database Design Patterns
├── Data Caching Strategies

Testing & Quality Assurance
├── Unit Testing
├── Integration Testing
└── Quality Tools

Build Tools & Dependency Management
├── Build Automation
├── Continuous Integration
└── Artifact Management

Security & Performance
├── Application Security
├── API Security
└── Performance Engineering

Modern Development Practices
├── DevOps Integration
├── API Development
└── Code Quality

Innovation & Emerging Technologies
├── AI & Machine Learning
├── Big Data & Analytics
└── Future Java Technologies

Real-World Projects & Case Studies
├── E-commerce Platform
├── Financial Trading System
├── Healthcare Application
└── IoT Platform

Career Development & Community
├── Professional Growth
├── Industry Trends
└── Community Engagement

☕ Java Unleashed: Master Modern Programming

Become a Java expert with our complete eBook: https://t.co/xQ68nAYOGl

[whitehats @wh1t3h4ts]

Networking protocols and their port numbers

[John @ionleu]

pls learn it once and for all

[Benita Mbulu @benitambulu_]

Up and Coding 👩‍💻

Jonas Course >>>>>

[Krishna Agrawal @Krishnasagrawal]

Most asked 50 SQL Interview Queries, only in 20 pages.

[Javier Dev @7_jram]

@MedioAmbienteSV Carretera a Quezalte / Opico / Lourdes llueve

[Krishna Agrawal @Krishnasagrawal]

Roadmap to Master JavaScript ✅️📘📚

[cybroxkid @cybroxkid]

DevOps in 2025

[Saquib Aftab @iamsaquibdev]

Code Example: Integrate Circuit Breaker into a Spring Boot application using Resilience4j

[Makakmayum @makakmayum_sid]

Recently in an interview a candidate was asked regarding the four core functional interfaces of Java 8. He went blank when asked what each of them is about.

Here are the 4 core functional interfaces:
1. Predicate<T>
Tests if an input satisfies a condition, returning true or false.
How I remember: Like a bouncer at a club checking if you're on the guest list before letting you in.

2. Function<T, R>
Takes one input and produces one output, transforming data.
How I remember: A vending machine that accepts coins (input) and dispenses a soda (output).

3. Supplier<T>
Provides a result without needing any input, like a factory method.
How I remember: A magic hat that pulls out a rabbit on demand, no tricks required upfront.

4. Consumer<T>
Accepts an input and performs an action on it, but returns nothing.
How I remember: A trash can that takes your garbage (input) and just disposes of it, no receipt given

I'm providing an example which uses all these 4

[sysxplore @sysxplore]

functions in bash scripting explained

[Mahesh @gutsOfDarkness8]

Secure Your Java App with JWT Authentication:
Implements JWT authentication for secure API access and user validation. Enhances application security with token based authorization.

[Fascinating @fasc1nate]

26 code words in the Phonetic Alphabet

[Ayush Shrivastava 🇮🇳 @ayshriv]

Mastering #SpringSecurity starts with understanding the basics:

Authentication

Authorization

Filters

SecurityContext
A secure app starts with the right config. Don’t skip the fundamentals!

#Java #SpringBoot #ayshriv

[Ayush Shrivastava 🇮🇳 @ayshriv]

Some Common used Docker Commands for Java Developers.