The upgrade to Spring Boot 3.0 represents the most significant breaking change in the Java ecosystem in the last decade. You change the version in your pom.xml , ensure your environment is running Java 17, and execute a build. The result is often a catastrophic wall of red text in your console, predominantly screaming one error: package javax.servlet does not exist This isn't just a deprecated method warning; it is a fundamental breakage of the API contract that underpins your web container, persistence layer, and dependency injection. Here is how to navigate the javax to jakarta transition with engineering rigor. The Root Cause: A Legal Split, Not a Technical One To fix the issue, you must understand that the bytecode signature of your application's core dependencies has changed. The Transfer: In 2017, Oracle donated Java EE (Enterprise Edition) to the Eclipse Foundation. The Trademark: While Oracle donated the source code, they retaine...
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