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Java 25 LTS Adoption Highlights Framework Migration Challenges for Enterprise Apps

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Java 25 LTS has become the recommended baseline for enterprise applications as of mid-2026, with Oracle's free license for Java 21 set to expire in September 2026. Millions of enterprise applications must migrate to Java 25 or face potential licensing risks. The migration is complicated by simultaneous framework upgrades, particularly for Spring Boot users moving from version 3.x to 4.x, which involves package-level refactoring due to namespace and library changes. By contrast, the lighter-weight Solon framework, built without legacy dependencies, claims low migration costs and compatibility across Java versions 8 through 26 on a single codebase. Benchmarks cited by Solon's proponents suggest significantly faster startup times and lower memory usage compared to Spring Boot 4.0 running on the same hardware.

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Java 25 LTS Adoption Highlights Framework Migration Challenges for Enterprise Apps · ShortSingh