Java 21 compatibility risks detailed for outdated Log4j and Jackson libraries.

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A developer guide analyzes the risks of running outdated software libraries on Java 21. It highlights that Log4j 1.2.17, end-of-life since 2015, contains multiple critical vulnerabilities, including remote code execution flaws. The article also examines Jackson Annotations 2.17.2 for compatibility issues. It notes that running the old Log4j version on Java 21 requires specific JVM flags to bypass system restrictions. The guide advises upgrading dependencies as the primary solution for security.

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