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Spring Boot 4.1 Adds gRPC Auto-Configuration, SSRF Mitigation, and Kotlin 2.3 Support

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Spring Boot 4.1 with gRPC and SSRF mitigation, directly actionable for Java developers.

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Spring Boot 4.1 Adds gRPC Auto-Configuration, SSRF Mitigation, and Kotlin 2.3 Support
Summary

Spring Boot 4.1, released June 10, 2026, introduces gRPC auto-configuration for server and client via Spring gRPC, HTTP-client SSRF mitigation through an `InetAddressFilter`, and upgrades to Kotlin 2.3. It also adds lazy datasource connections, async Micrometer context propagation, and improved OpenTelemetry support with togglable `management.opentelemetry.enabled`. This incremental release builds on Spring Framework 7.0.x, maintains a JDK 17 baseline (though jOOQ 3.20 requires Java 21), and marks the first schedule delay since Spring Boot's twice-yearly cadence began in 2020.