Category: Spring
How do @PostConstruct and @PreDestroy annotation work in java?
Methods annotated with @PostConstruct and @PreDestroy are commonly used in the lifecycle of beans managed by the container, such as in frameworks like Spring or Quarkus. An example of their use is opening and closing database connections. If you want to know more about Bean management in Spring, don’t hesitate to read this post. @PostConstruct…
Read More How do functional interfaces work in Java?
Functional Interfaces are a fundamental concept in functional programming introduced in Java 8. They are interfaces that have exactly one abstract method, allowing the use of lambda expressions and method references to make the code more concise and readable. They can be used in Streams, for example, and promote code reuse. We can find several…
Read More What is Shallow Copy and Deep Copy in Java?
When developing software, there may be situations where it is necessary to create copies of objects to prevent unwanted behaviors, whether to avoid different parts of the system modifying the same object or for any other reason that prevents undesired behavior. Java provides the Cloneable interface, which allows object copying. There are two types of…
Read More How does serialization and deserialization work in Java?
Serialization and deserialization are essential for persisting or transferring data between systems. Serialization transforms Java objects into formats like JSON or XML, enabling storage or network transmission. Deserialization, on the other hand, restores these objects, making the data reusable in applications. These processes are widely used in APIs, data persistence, and communication between distributed systems,…
Read More How to use Generic Types in Java?
The use of Generics in Java improves security, readability, and code reuse, simplifying the development of robust and secure applications. Let’s see some usage examples below. Generic Methods <T>: It’s a generic type parameter, accepting any type. T Item: The method accepts a parameter of the generic type. We can specify, for example, String and…
Read More How to sort Java Collections?
Sorting in Java Collections is an essential feature for organizing collection elements in ascending or descending order. Using the Comparable or Comparator interfaces, custom sorting criteria can be defined. The Collections class provides utility methods, such as sort(), to apply these rules. This enables efficient and flexible data processing. Hands on The following example is…
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How does Poor Man’s Load Balancer work?
Understanding the concept of Poor Man’s Load Balancer is an interesting and educational approach, especially for grasping the fundamentals of horizontal scalability using containers and load balancing. Horizontal scalability allows multiple container instances, and requests will be distributed by the Load Balancer. This model is widely used in high-demand environments. Benefits: Problems and Solutions: How…
Read More How to run tasks in parallel with timeout in Java?
The use of Threads is essential to improving the performance and responsiveness of modern applications. With threads, it is possible to execute multiple tasks simultaneously, maximizing processor resources. They allow intensive operations, such as calculations or accessing external resources (e.g., databases, APIs), to be performed in parallel without blocking the main execution. Imagine the following…
Read More What is Docker Compose and how to use?
Docker Compose is a tool that allows you to define and manage multi-container applications for Docker using a single YML file (docker-compose.yml). With it, you can configure services, networks, and volumes in a readable and reproducible format. It is ideal for managing complex environments where multiple services (such as a database, cache, and backend) need…
Read More How to create a Docker Image using maven?
Creating Docker images using Maven is essential to integrate the containerization process directly into the application’s build and deployment pipeline, offering significant benefits for developers and DevOps teams. Let’s see how to create a Docker image with Maven in Spring. This post is a continuation of the previous one; if you have any questions, feel…
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