Spring framework 7 and Spring Boot 4

1.java

@EnableResilientMethods
class Demo {

  // 5 retry attempts and an exponential back-off strategy with a bit of jitter
  @Retryable(maxAttempts = 5, delay = 100, jitter = 10, multiplier = 2, maxDelay = 1000)
  public void sendNotification() {
      this.jmsClient.destination("notifications").send(...);
  }

  //
  @ConcurrencyLimit(10)
  public void sendNotification() {
      this.jmsClient.destination("notifications").send(...);
  }
}

Demo.java

import org.jspecify.annotations.NonNull;
import org.jspecify.annotations.Nullable;

public class Demo {
    private String name;

    public void setName(@NonNull String name) {
        this.name = name;
    }

    @Nullable
    public String getName() {
        return this.name;
    }
}

DemoController.java

@RestController
public class DemoController {

    @GetMapping(value = "/hi", version = "1")
    public String v1(){
        return "V1";
    }

    @GetMapping(value = "/hi", version = "2")
    public String v2(){
        return "V2";
    }
    
}

WebConfiguration.java

@Configuration
public class WebConfiguration implements WebMvcConfigurer {

    @Override
    public void configureApiVersioning(ApiVersionConfigurer configurer) {
        configurer.useRequestParam("version");
    }
}