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Find by Property of a Nested Object in Spring Data
1. Overview In Spring Data, it’s common to query entities using derived queries based on method names. When dealing with relationships between entities, such as nested objects, Spring Data provides...
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Filter a List by Nested Lists in Java
1. Introduction In this tutorial, we’ll explore how to filter a list that contains nested lists in Java. When working with complex data structures, such as lists of objects that contain other lists, it...
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Java Date and Calendar: From Legacy to Modern Approaches
1. Overview Handling date and time is a fundamental part of many Java applications. Over the years, Java has evolved in dealing with dates, introducing better solutions to simplify things for...
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Consuming Messages in Batch in Kafka Using @KafkaListener
1. Overview In this tutorial, we’ll discuss handling Kafka messages in batches with Spring Kafka library’s @KafkaListener annotation. Kafka broker is a middleware that helps persist messages from...
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Introduction to JetBrains Xodus
1. Overview Xodus is an open-source embedded database built by JetBrains. We can use it as an alternative to relational databases. Using Xodus we obtain a high-performance transactional key-value store...
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Java Weekly, Issue 567
1. Spring and Java >> Exploring New Features in JDK 23: Module Design Pattern with JEP-476 [foojay.io] JDK 23 brings module imports as a preview feature, intending to simplify the import of...
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Introduction to JavaMelody
1. Introduction As application developers, we generally build complex business logic as efficiently as possible. However, once these applications are in production, we would also like to gather runtime...
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Connect to Oracle Database with JDBC Driver
1. Overview The Oracle Database is one of the most popular relational databases. In this tutorial, we’ll learn how to connect to an Oracle Database using a JDBC Driver. 2. The Database To get us...
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Mockito Answer API: Returning Values Based on Parameters
1. Introduction Mocking is a testing technique that replaces real components with objects that have predefined behavior. This allows developers to isolate and test specific components without relying...
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Introduction to Lanterna
1. Introduction Lanterna is a library for building text-based user interfaces, giving us similar abilities to the Curses C library. However, Lanterna is written in pure Java. It also gives us the...
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How to Add a UTF-8 BOM in Java
1. Introduction In text encoding, the Byte Order Mark (BOM) is a special marker at the beginning of a file that indicates its byte order and encoding scheme. For UTF-8 encoding, the BOM is a sequence...
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Disable Hibernate Entity Validation in a Spring Boot Project
1. Overview In Spring Boot projects that use Hibernate, entity validation is typically applied automatically during persistence. While Hibernate’s built-in validation is useful, it can become redundant...
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Extract IP Address From a String in Java
1. Overview When processing log files or analyzing network traffic data, we often need to extract IP addresses from a given String in Java. In this tutorial, we’ll examine the format of IPv4 addresses...
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Java Weekly, Issue 568
1. Spring and Java >> Java 24 to Reduce Object Header Size and Save Memory [infoq.com] and >> JEP 493: Linking Run-Time Images without JMODs [openjdk.org] The Java platform is always...
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Convert JSON to Avro Object
1. Introduction In this tutorial, we’ll explore how to convert JSON data to Apache Avro objects in Java. Avro is a data serialization framework that provides rich data structures and binary data in a...
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Relationship and Difference Between HAL and HATEOAS
1. Overview Web APIs have rapidly evolved with the rise of REST (Representational State Transfer). REST-based APIs allow developers to build powerful web applications that are modular, scalar, and...
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Solving Tape Equilibrium Problem in Java
1. Overview In this tutorial, we’ll introduce the tape equilibrium problem and find an efficient solution. This problem is a common interview question. We’ll see that a good way to approach this...
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AI Image Generation With OpenAI DALL·E 3 in Java
1. Overview Artificial Intelligence is changing the way we build web applications. One exciting application of AI is generating an image from a text-based description. OpenAI’s DALL·E 3 is a popular...
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Leveraging Generational ZGC for Optimal Temporary Object Management
1. Introduction Managing temporary objects is a crucial performance factor in Java virtual machine optimization. With the introduction of Generational ZGC (Z Garbage Collector) in Java 21 (now...
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Guide to Using the JMeter Beanshell
1. Introduction In this quick tutorial, we’ll create a test case that uses most of the BeanShell features available in JMeter. Ultimately, we’ll learn how to use the necessary tools to make any test...
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