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Introduction If you’re working with Spring Boot JWT authentication and encounter the error "Full authentication is required to access this resource" even with a valid token, the issue often lies…

Migrating a Spring Boot application from JDK 11 to JDK 17 can sometimes lead to unexpected runtime errors, especially when dealing with XML parsing and dependencies. One such common error…

When working on a Spring Boot project, you might encounter the error "variable not initialized in the default constructor". This issue is common, especially when using Lombok annotations like @RequiredArgsConstructor…

Understanding thread states like WAIT and BLOCKED is crucial for debugging concurrency issues in Java. This guide demystifies these states, explains their differences, and shows how to identify them in…

If you’re using Spring WebFlux and encountering shutdown warnings like this: WARN 24696 --- [on(2)-127.0.0.1] o.a.c.loader.WebappClassLoaderBase : The web application [ROOT] started thread [reactor-http-epoll-1] but failed to stop it. This…

Understanding the differences between software threads, hardware threads, and Java threads is crucial for optimizing application performance, especially in multi-threaded environments. In this guide, we’ll break down these concepts, explore…

Generating a single JaCoCo coverage report for a multi-module Maven project can be tricky. If you're struggling to aggregate results from sub-modules into one report, this guide will walk you…

Null checks are a common part of Java programming to prevent NullPointerException (NPE). Many developers rely on if (x != null), but excessive null checks can clutter code and make…

Do you want your custom Spring Boot library to seamlessly integrate into consumer applications, automatically registering necessary beans without manual configuration? This approach, similar to official Spring Boot starters, can…

In Spring Boot 3.4.2, the behavior of ServerHttpRequest#getURI() has changed, particularly in how it processes X-Forwarded-* headers. This change is due to an update in Reactor Netty, which now supports…

Introduction When using Spring Boot @Value annotation to load resources like XML files in a JavaFX project with Java 9 modules, you might encounter a FileNotFoundException. The issue arises when…

Spring Boot simplifies Java development by providing an auto-configuration framework and embedded servers, making it easy to create stand-alone, production-ready applications. This guide expands on packaging and running Spring Boot…