o.s.c.f.c.c.BeanFactoryAwareFunctionRegistry : Failed to locate function 'myfunc' for function definition 'myfunc'. Returning null.

[patpatpat123]

Describe the bug
Hello team,

I am currently using spring-boot-starter-parent 3.5.3 (which is the latest as of this writing)

While I am not using the spring cloud dependency entirely, I am using this in my pom:

 <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-function-context</artifactId>
            <version>4.3.0</version>
        </dependency>

Here is my code:

@Service
public final class FuncService {

private final FunctionCatalog functionCatalog;
   
    public FuncService(final FunctionCatalog catalog) {
        this.functionCatalog = catalog;
      
    }

 public Flux<Bar> applyCorrectFunc(final Flux<Foo> fooFlux) {
        final Function<Flux<Foo>, Flux<Bar>> foobar = functionCatalog.lookup(applicationConfiguration.getFunctionDefinition()); //returns the name of the function 
        return foobar.apply(fooFlux);
    }

    @Bean
    public Function<Flux<Foo>, Flux<Bar>> myfunc() {
        return fooFlux -> //code to transform to barFlux;
    }

The issue is that in my log, I am always seeing this message:

o.s.c.f.c.c.BeanFactoryAwareFunctionRegistry : Failed to locate function 'myfunc' for function definition 'myfunc'. Returning null.

It seems the first call to this function will yield this message, while subsequent calls to the exact same function will work.

May I ask what is the root cause of this issue?

Thank you for your help.

[ls-urs-keller]

Seems like a small bug, it does a lookup right before registering it and the dolookup -> compose logs a warning because it can't find it.