Java
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HibernateException: Illegal Collection Association Fix
In Hibernate, the exception IllegalAttemptToAssociateACollectionWithTwoOpenSessionsException occurs when a collection or entity is associated with two active Hibernate sessions simultaneously. This…
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Java Mail Inline Images in Emails Example
Sending rich emails with embedded images can significantly improve user engagement. The JavaMail API allows developers to send inline images…
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A Comprehensive Guide to Java GUI Frameworks
Java has been a cornerstone in application development for decades, and one of its enduring strengths is the ecosystem of…
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JSP Map Looping Example
In Java web apps, you’ll often expose server-side data (e.g., a Map<K,V>) to a JSP for display. Let us delve…
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Object-Oriented Design Patterns with Java
1. Introduction Object-Oriented Design Patterns came out from software engineers recognizing recurring problems and formalizing solutions as reusable, named patterns.…
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Unleash the Power of Open Source Java Profilers: Comparing VisualVM, JMC, and async-profiler
Performance tuning in Java often feels like detective work. Applications run fine in development but slow down in production. Memory…
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Spring Boot & Flyway: Manage Multiple Databases
Managing multiple databases in a Spring Boot application can be challenging, especially when you want to maintain database migrations consistently.…
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Programmatic Bean Registration with Spring BeanRegistrar
The BeanRegistrar interface is designed for cases where we want to register beans with the application context programmatically. Instead of…
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Migrating a Legacy RMI Application to WebSockets — A Pragmatic Guide
Remote Method Invocation (RMI) was once the straightforward way for Java apps to talk across a network. But it’s tightly…
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