Spring Boot
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Enterprise Java
Spring Boot 4 vs. 3: What Actually Changed
The migration guides list dozens of changes. Most articles rehash the changelog. This piece focuses on the three changes that…
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Core Java
OpenRewrite: The Automated Migration Tool That’s Quietly Changing How Teams Upgrade Java
It started at Netflix, migrated the Jakarta EE TCK, and is now the dominant automation tool for Java modernization according…
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Enterprise Java
Spring Boot With PostgreSQL On Heroku
In modern cloud-native applications, deploying backend services on platforms like Heroku and connecting them to managed databases such as PostgreSQL…
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Enterprise Java
The Classloading Graph: Why Your Spring Boot App’s Startup Time Is a Classloading Problem and Not a Bean Problem
Startup time is nearly always blamed on bean initialisation. The actual bottleneck is usually classloading — a graph traversal problem…
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Enterprise Java
Fixing Spring Boot Error “The Elements Were Left Unbound”
Spring Boot provides a flexible way to manage application configuration using external property files. However, when these properties are bound…
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Enterprise Java
JMS Messaging in Spring Boot Using JmsClient
Messaging plays an important role in building scalable, loosely coupled distributed systems. Instead of tightly coupling services via synchronous HTTP…
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Enterprise Java
Implementing API Versioning in Spring
APIs must evolve as business requirements change, but breaking existing consumers is rarely acceptable. A clear versioning strategy enables services…
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Enterprise Java
Java Commit with JdbcTemplate vs DataSource
In Spring-based Java applications, database access is commonly performed using JdbcTemplate or higher-level abstractions such as JPA. A frequent source…
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Core Java
Apache POI HSSFWorkbook: Read, Write, and Stream Excel
Working with Excel files is a common requirement in enterprise Java applications, whether for reporting, data exchange, or bulk uploads.…
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