. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.3. Null-safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . but Kotlin’s clever type inference allows for shorter syntax. 1.3. Null-safety One of Kotlin’s key features is null-safety, which cleanly deals with null values at compile time rather than bumping this comprehensive guide to Kotlin null-safety.) Although Java does not let you express null-safety in its type-system, the Spring Framework provides null-safety of the whole Spring Framework API via tooling-friendly

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.3. Null-safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . but Kotlin’s clever type inference allows for shorter syntax. 1.3. Null-safety One of Kotlin’s key features is null-safety, which cleanly deals with null values at compile time rather than bumping this comprehensive guide to Kotlin null-safety.) Although Java does not let you express null-safety in its type-system, the Spring Framework provides null-safety of the whole Spring Framework API via tooling-friendly

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 434 7. Null-safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . package — for example, javax.annotation.Nullable from JSR-305) or just leverage Kotlin builtin null- safety support: Java public class SimpleMovieLister { @Autowired public void setMovieFinder(@Nullable framework.adapter javadoc for further information. 434 Chapter 7. Null-safety Although Java does not let you express null-safety with its type system, the Spring Framework now provides the following

Your Own Starter Naming autoconfigure Module Starter Module 48. Kotlin support Requirements Null-safety Kotlin API runApplication Extensions Dependency management @ConfigurationProperties Testing Resources provided by default if one bootstraps a Kotlin project on start.spring.io. Null-safety One of Kotlin’s key features is null-safety. It deals with null values at compile time rather than deferring the problem comprehensive guide to null- safety in Kotlin. Although Java does not allow one to express null-safety in its type system, Spring Framework, Spring Data, and Reactor now provide null-safety of their API via tooling-friendly

Your Own Starter Naming autoconfigure Module Starter Module 47. Kotlin support Requirements Null-safety Kotlin API runApplication Extensions Dependency management @ConfigurationProperties Testing Resources provided by default if one bootstraps a Kotlin project on start.spring.io. Null-safety One of Kotlin’s key features is null-safety. It deals with null values at compile time rather than deferring the problem comprehensive guide to null- safety in Kotlin. Although Java does not allow one to express null-safety in its type system, Spring Framework, Spring Data, and Reactor now provide null-safety of their API via tooling-friendly

................................................................................. 185 47.2. Null-safety ................................................................................................ default if one bootstraps a Kotlin project on start.spring.io. 47.2 Null-safety One of Kotlin’s key features is null-safety. It deals with null values at compile time rather than deferring the problem comprehensive guide to null-safety in Kotlin. Although Java does not allow one to express null-safety in its type system, Spring Framework, Spring Data, and Reactor now provide null-safety of their API via tooling-friendly

Your Own Starter Naming autoconfigure Module Starter Module 47. Kotlin support Requirements Null-safety Kotlin API runApplication Extensions Dependency management @ConfigurationProperties Testing Resources provided by default if one bootstraps a Kotlin project on start.spring.io. Null-safety One of Kotlin’s key features is null-safety. It deals with null values at compile time rather than deferring the problem comprehensive guide to null- safety in Kotlin. Although Java does not allow one to express null-safety in its type system, Spring Framework, Spring Data, and Reactor now provide null-safety of their API via tooling-friendly

Your Own Starter Naming autoconfigure Module Starter Module 49. Kotlin support Requirements Null-safety Kotlin API runApplication Extensions Dependency management @ConfigurationProperties Testing Resources provided by default if one bootstraps a Kotlin project on start.spring.io. Null-safety One of Kotlin’s key features is null-safety. It deals with null values at compile time rather than deferring the problem comprehensive guide to null- safety in Kotlin. Although Java does not allow one to express null-safety in its type system, Spring Framework, Spring Data, and Reactor now provide null-safety of their API via tooling-friendly

Your Own Starter Naming autoconfigure Module Starter Module 48. Kotlin support Requirements Null-safety Kotlin API runApplication Extensions Dependency management @ConfigurationProperties Testing Resources provided by default if one bootstraps a Kotlin project on start.spring.io. Null-safety One of Kotlin’s key features is null-safety. It deals with null values at compile time rather than deferring the problem comprehensive guide to null- safety in Kotlin. Although Java does not allow one to express null-safety in its type system, Spring Framework, Spring Data, and Reactor now provide null-safety of their API via tooling-friendly

Your Own Starter Naming autoconfigure Module Starter Module 48. Kotlin support Requirements Null-safety Kotlin API runApplication Extensions Dependency management @ConfigurationProperties Testing Resources provided by default if one bootstraps a Kotlin project on start.spring.io. Null-safety One of Kotlin’s key features is null-safety. It deals with null values at compile time rather than deferring the problem comprehensive guide to null- safety in Kotlin. Although Java does not allow one to express null-safety in its type system, Spring Framework, Spring Data, and Reactor now provide null-safety of their API via tooling-friendly