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Learn how to implement null safety in Java Spring applications using JSpecify annotations and NullAway tools in this comprehensive conference talk. Discover JSpecify, a collaborative effort between major JVM ecosystem companies including Google, JetBrains, Oracle, Uber, and Broadcom, which provides annotations, specifications, and documentation to verify null-safety at compile time. Explore how these annotations help detect potential NullPointerExceptions before runtime, transforming what Tony Hoare called "the billion dollar mistake" into a useful feature for specifying potential absence of values. Understand how JSpecify annotations are natively supported by Kotlin 2+ to infer null-safety from Java APIs, making Java libraries more idiomatic for Kotlin developers. Examine practical implementation strategies using NullAway for compile-time verification and IDE integration. Get insights into how the upcoming Spring Framework 7.0 and Spring Boot 4.0 releases will leverage JSpecify to create safer applications at both framework and application levels. The session is presented by Sébastien Deleuze, a Spring Framework Core Committer at Broadcom and JSpecify working group member, who leads null safety efforts, Kotlin support, and runtime efficiency initiatives for Spring applications.
