Best of Java — July 2024

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Amigoscode·2y
Java Roadmap
A comprehensive guide for Java developers covering essential topics such as Linux, Git, IDE options (IntelliJ, Eclipse, VSCode), core Java concepts (OOP, Arrays, Polymorphism, etc.), Collections, advanced topics (Dependency Injection, Design Patterns, Multi-Threading), Exception Handling, Streams & Functional Programming, Testing, Databases, Clean Code principles, Logging, Build Tools (Maven, Gradle, Bazel), HTTP (Rest API, GraphQL), and Java frameworks (Spring Boot, Play, Quarkus).
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freeCodeCamp·2y
Multithreading for Beginners
Multithreading allows concurrent execution of threads for optimized resource use and improved application performance. It is crucial for handling multiple tasks simultaneously and is extensively used in Java. A comprehensive course on the freeCodeCamp.org YouTube channel covers multithreading basics to advanced topics, including thread creation, synchronization, inter-thread communication, and advanced frameworks like ExecutorService and ForkJoinPool. The course aims to enhance programming skills and opens up numerous career opportunities.
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Article
Baeldung·2y
Apache Kafka Tutorial Series
This tutorial series covers essential topics about Apache Kafka, including its basics, how to integrate it with Spring Boot, configuring Kafka SSL, and setting up Kafka using Docker. It also explores Kafka consumer groups, retry mechanisms, and message ordering strategies, providing practical guidance for both newcomers and experienced developers.
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Article
JetBrains·2y
Is Java Still Relevant Nowadays?
Java remains a significant programming language in the tech world, with stable usage among developers and broad applications across industries like IT services, mobile development, and cloud computing. It continues to offer strong career prospects and a solid foundation in programming principles. The State of Developer Ecosystem 2023 survey shows that Java is widely used by professionals who appreciate its reliability and platform independence.
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Article
JetBrains·2y
Top Tools for Java Developers in 2024
Discover the top tools for Java developers in 2024, including the essential JDK, powerful IDEs, build and dependency management tools like Maven and Gradle, and tools for version control, monitoring, database management, containerization, CI/CD, and AI integration. Enhance productivity and streamline your development processes with these crucial tools.
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Article
This is Learning·2y
7 Open Source Projects You Should Know - Java Edition ✔️
Discover seven notable open-source projects written in Java, spanning various domains from Android testing (Robolectric) to distributed search engines (Elasticsearch and OpenSearch), to IoT platforms (ThingsBoard). Each project includes a brief overview, key features, and starter guides, making them great for both potential use and contribution.
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Awesome Java Newsletter·2y
**🌟 Mastering the Java Collections Framework 🌟**
The Java Collections Framework provides powerful data structures like Lists, Sets, and Maps, which allow for efficient data storage and manipulation. It offers flexibility with different implementations such as `ArrayList`, `HashSet`, and `HashMap`. Key components include ordered lists, unordered sets, and key-value pair maps. Pro tips include choosing the right collection type, ensuring thread safety, and utilizing Java 8+ features like Streams and Lambda expressions.
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Article
Faun·2y
Spring Boot 3.1 JWT Authentication &Authorization: Secure Your APIs Like a Pro🔒
Learn how to secure your Spring Boot 3.1 applications using JWT authentication and authorization. This guide covers creating a Spring Boot project, setting up dependencies, creating secure endpoints, and configuring JWT tokens for user authentication. Includes practical examples and code snippets to help you implement security measures swiftly.
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Article
Javarevisited·2y
Why does Java remain so popular?
Java remains popular due to its versatility, user-friendly syntax, strong community support, and excellent documentation. It is used widely in various domains such as banking, big data, Android development, scientific apps, and eCommerce. Features like platform independence and reliability in enterprise and large-scale systems contribute to its enduring success.
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Just Java·2y
Java & Spring Best Practices | Strategy Pattern
The new module in the `java-spring-best-practices` repository focuses on the Strategy Pattern, detailing how to implement it in a Spring application. It emphasizes designing code that is flexible and extensible, helping developers decouple algorithm selection from the main logic. Check out the module for practical examples and contribute to the project on GitHub.
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Article
KDnuggets·2y
Learn Computer Science with Princeton University for FREE!
Princeton University offers a range of free computer science courses suitable for beginners to advanced learners. These include foundational programming with Java, algorithms, theoretical computation, and computer architecture. The courses are designed with flexible schedules and cover essential skills needed to start a career in tech.
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Article
Awesome Java Newsletter·2y
TreeMap in Java: A Must-Know Data Structure
TreeMap is a Red-Black tree-based implementation of the NavigableMap interface in Java, maintaining key-value pairs in sorted order. Unlike HashMap, TreeMap does not support null keys and has a time complexity of O(log n) for basic operations. It is ideal for scenarios requiring sorted data and efficient range operations, such as event logging, financial applications, scheduling, version control, caching, leaderboards, and spell checking. Key methods include `put`, `get`, `remove`, navigation methods like `firstKey`, `lastKey`, and range views like `headMap`, `tailMap`, and `subMap`.
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Article
Amigoscode·2y
Java Main Method Explained
The post highlights how the main method in Java is written and points out that Java 21 has simplified this significantly, though the original keywords are still used consistently across the language.
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Article
Baeldung·2y
Returning Errors Using ProblemDetail in Spring Boot
Learn how to use ProblemDetail for standardized error responses in Spring Boot applications. Discover why it's important for API usability, how it streamlines error handling, and explore its implementation in both MVC and reactive applications. Includes setup, configuration, and global exception handling examples, complete with testing methods.
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ThePrimeTime·2y
Use Java For Everything
The post discusses the author's preference for Java as a universal programming language, arguing that many developers claim to choose the 'right tool for the job' but often default to their most familiar language. The author criticizes the misuse of JavaScript and other languages where they might not be optimal. The benefits of static typing and Java's performance are emphasized, alongside a humorous critique of how developers might overcomplicate solutions with unfamiliar languages. The post concludes with a call for using the best-suited language for tasks but also highlights the efficiency and reliability of Java when properly leveraged.
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Article
Javarevisited·2y
How to use @Transactional annotation like a pro
Explores advanced usage of the @Transactional annotation in Java Spring microservices to manage concurrency and transactional integrity. Highlights include solving issues with parallel processing in distributed systems, understanding isolation levels, and optimizing transactions. Provides examples with Kafka, PostgreSQL, and Spring Data JPA along with practical tips for using @Transactional effectively.
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Article
Stack Overflow Blog·2y
Java, but why? The state of Java in 2024
Java has evolved significantly since its early days, shedding its verbosity and providing robust, secure performance. Lenny highlights Java's modern features, such as production quality releases every six months and its strong security track record. Key technologies like Virtual Threads, Apache Groovy, and Jakarta EE further enhance Java programming, making it a powerful choice for developers.
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Javarevisited·2y
SOLID Principles: OOP Fundamentals
The SOLID principles are five key guidelines for healthy, sustainable, and maintainable software development. These principles include Single Responsibility, Open/Closed, Liskov Substitution, Interface Segregation, and Dependency Inversion. Each principle is explained with examples demonstrating how to implement them in real-world programming scenarios, highlighting their importance in creating modular, flexible, and maintainable codebases.
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Article
Just Java·2y
Java & Spring Best Practices | Factory Pattern
The third module of the java-spring-best-practices repository introduces the Factory Pattern, a design pattern for flexible object creation. Learn how to decouple object creation, enhance scalability, and improve maintainability in your codebase. The module includes practical examples, core principles, benefits, and End-to-End tests for validation.
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freeCodeCamp·2y
What is Primitive Obsession?
Primitive Obsession is a code smell where primitives like strings and integers are overused to represent complex concepts such as email addresses, phone numbers, and unique IDs. This leads to issues like weak type checking, poor readability, code duplication, and difficulty in refactoring. The post discusses the drawbacks of primitive obsession and offers strategies to design more robust data structures for better code correctness, maintainability, and data safety. It emphasizes the importance of encapsulation and being vigilant about special validation, comparison, and formatting rules for variables.
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Netflix TechBlog·2y
Java 21 Virtual Threads - Dude, Where’s My Lock?
Netflix engineers encountered issues with virtual threads in Java 21 causing timeouts and hung instances in their microservices running on SpringBoot 3 and embedded Tomcat. Detailed diagnostics revealed that virtual threads were waiting for reentrant locks, with OS threads pinned and unable to release, leading to a variation of deadlock. The investigation and resolution process underscores the challenges and potential of adopting virtual threads for improved performance.
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Dev Genius·2y
Kafka Demo Project: Part 1. Producers
This post introduces a step-by-step guide to a Kafka demo project using Java and Spring Boot. It covers setting up a Kafka cluster on Confluent Cloud, configuring the Confluent Schema Registry, and creating a Producer application to send messages to Kafka topics. Essential configurations for the 'application.properties' and 'application.yml' files, as well as Maven dependencies, are also discussed. The post concludes with an example of sending a POST request to the producer and exploring cluster configurations using Kafka's Admin API.
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Community Picks·2y
Top 7 Techniques to Optimize Caching in Spring Boot
Caching is a recommended technique to improve application performance. The post highlights 7 methods for optimizing caching in Spring Boot applications. Key techniques include identifying ideal caching candidates, setting proper cache expiration policies, implementing conditional caching, choosing between distributed and local caches, customizing key generation strategies, using asynchronous caching, and monitoring cache metrics. The post also mentions how Digma, an observability platform, can help in identifying cache misses and inefficiencies in queries.
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Article
Inside Java·2y
Converting Data Sources to Streams
Learn how to transform imperative-style loops into functional-style streams in Java. This guide walks through converting a file-reading task using BufferedReader into a streamlined process using the Streams API. Key functions include filter() and map(), which simplify data manipulation by treating the content as streams.
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Javarevisited·2y
6 Tips to Avoid NullPointerException in Java
NullPointerException is a frequent error in Java caused by accessing null references. Preventing this error improves code reliability and maintainability. Key tips include performing null checks, using the equals method correctly, leveraging the Optional class from Java 8, using String.valueOf() and Objects.requireNonNullElse() methods, and opting for primitive types when possible. Annotations and the Bean Validation API in Spring can also help ensure null checks. Implementing these strategies reduces the likelihood of NullPointerException and enhances code robustness.
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