Optimizing Data Filtering with Java 8 Predicates
Java 8 introduced a powerful functional interface called Predicate that revolutionized data filtering. By providing a concise and expressive way to define filtering criteria, predicates significantly...
View ArticlehasItems() vs. contains() vs. containsInAnyOrder() in Hamcrest
Hamcrest is a popular framework for writing matcher objects, allowing for more readable and flexible unit tests. Among its many matchers, hasItems(), contains(), and containsInAnyOrder() are often used...
View ArticleImplementing an Elasticsearch Aggregation Query in Java
Elasticsearch is a distributed search engine that is designed for scalability, flexibility, and high performance. It allows us to store, search, and analyze large volumes of data quickly. One of its...
View ArticleFlux vs Mono: Choosing the Right Reactive Stream in Java
Reactive programming has emerged as a powerful paradigm for building scalable and responsive applications. At the heart of this paradigm in Java are Flux and Mono, two fundamental building blocks...
View ArticleA Deep Dive into Sealed Classes and Interfaces
Java’s introduction of sealed classes and interfaces marked a significant step towards enhancing type safety and code predictability. These language features provide a powerful mechanism for...
View ArticleRead Last N Lines From File in Java
Reading the last N lines of a file is a common task in Java, especially when dealing with log files or other large files where only the most recent entries are of interest. Java provides multiple ways...
View ArticleStore File or byte[] as SQL Blob in Java (Store and Load)
In many applications, you might need to store files or binary data directly in a database. PostgreSQL offers a data type called BLOB (Binary Large Object) that is suitable for storing binary data such...
View ArticleCreating Custom Runtime Images with jlink
Java applications, particularly those designed for deployment in resource-constrained environments or with specific security requirements, benefit greatly from reduced runtime footprints. This is where...
View ArticleHow to Fix PSQLException Operator Does Not Exist Character Varying = UUID
When working with Spring JPA and PostgreSQL, you might encounter an error like PSQLException: Operator Does Not Exist: character varying = uuid. This exception occurs when you try to compare or join a...
View ArticleHow to Delay a Stubbed Method Response With Mockito
In unit testing, Mockito is a popular framework for creating mock objects and defining their behavior. Sometimes, there is a need to simulate delays in the response of a stubbed method, particularly...
View ArticleDouble Negatives: The Enemy of Clear Code
Code readability is paramount for maintainable and efficient software development. While the logic behind code might be crystal clear to the developer, it’s essential to consider the perspective of...
View ArticleBoost DTO Creation with Records & MapStruct in Spring Boot
DTO (Data Transfer Object) creation is a common task in Spring Boot applications. Traditionally, this involved writing boilerplate code for POJOs. However, with the introduction of Java records and the...
View ArticleFor Loops vs. Stream.forEach: When to Use Which
In modern Java programming, developers often face the choice between using traditional for loops and the more functional approach of Stream.forEach for iterating over collections. While both methods...
View ArticleTesting CORS in Spring Boot
CORS (Cross-Origin Resource Sharing) is a mechanism that allows resources on a web server to be requested from another domain. In Spring Boot, configuring and testing CORS can be straightforward,...
View ArticleArithmetic Ops On Precision Binary Ints in Java
Java provides robust support for handling binary integers, including operations on arbitrary-length binary integers. Let us delve to understand how to perform arithmetic operations on such integers,...
View ArticleHTTP Request and Response Logging Using Logbook in Spring
Zalando Logbook is a popular Java library that provides detailed HTTP request and response logging capabilities. It’s highly customizable and can be easily integrated into Spring Boot applications. Let...
View ArticleSpring Boot Performance: Maximizing Request Handling
Spring Boot has rapidly become the go-to framework for building robust and scalable web applications. Its ease of use and powerful features have contributed to its widespread adoption. However, as the...
View ArticleTroubleshooting Hibernate’s UnknownEntityException: Could Not Resolve Root...
One common issue developers may face with Hibernate is the UnknownEntityException, particularly the message: Could not resolve root entity. This error, known as the Hibernate UnknownEntityException:...
View ArticleDeep Dive into Map.merge()
Java’s Map interface is a cornerstone of data structures, offering a versatile way to store key-value pairs. While it provides fundamental operations like put, get, and remove, the merge method...
View ArticleContainerize a Spring Boot Application With Podman Desktop
Containerization is a critical aspect of modern software development, enabling developers to package applications with all their dependencies into isolated environments. Let us delve into understanding...
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