Support Spring Boot 2.4.0

Hello SBA Team,

We were using SBA 2.3.0 with Springboot 2.3.x for a while, no problem, very happy.

Springboot recently announced the release of 2.4.0-RC1. We bumped everything on our side to 2.4.0-RC1 and Illford, and believe the current SBA is not compatible.

@EnableAdminServer
@SpringBootApplication
public class Application {
    
    public static void main(String[] args) {
        SpringApplication.run(Application.class);
    }

}

An attempt was made to call a method that does not exist. The attempt was made from the following location:

    de.codecentric.boot.admin.server.services.AbstractEventHandler.start(AbstractEventHandler.java:57)

The following method did not exist:

    'reactor.core.publisher.Flux reactor.core.publisher.Flux.retryWhen(java.util.function.Function)'

The method's class, reactor.core.publisher.Flux, is available from the following locations:

    jar:file:/Users/Users/.m2/repository/io/projectreactor/reactor-core/3.4.0/reactor-core-3.4.0.jar!/reactor/core/publisher/Flux.class

The class hierarchy was loaded from the following locations:

    reactor.core.publisher.Flux: file:/Users/Users/.m2/repository/io/projectreactor/reactor-core/3.4.0/reactor-core-3.4.0.jar


Action:

Correct the classpath of your application so that it contains a single, compatible version of reactor.core.publisher.Flux


Process finished with exit code 1

Could you please help?

[njoysubho]

I created a PR for this.

[njoysubho]

Hello Team, The issue is happening because of the removal of the following method from reactor-core 3.4.0

public final Flux<T> retryWhen(Function<Flux<Throwable>, ? extends Publisher<?>> whenFactory) which is being used in many locations.

If it is not already being worked upon can I work on it ?