According to a recent LinkedIn post from HeroDevs, the company has examined hundreds of Spring Boot upgrade projects and suggests that many teams underestimate the complexity of moving from Spring Boot 3.5 to 4. The post highlights that beyond a simple version change, upgrades may require shifts in JDK baselines, major dependency updates such as Hibernate and Servlet APIs, and adjustments to build tools and plugins.
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The LinkedIn post further notes that while smaller applications may handle these migrations more easily, large enterprise systems with extensive dependencies and long-standing integrations can face significantly extended timelines. To address this, HeroDevs indicates it has developed a Spring Boot Migration Calculator that uses real migration data to help teams better estimate required effort, which could position the firm as a specialized service provider in complex Java modernization projects and potentially support revenue growth tied to large-scale enterprise clients.