How to schedule job by helidon MP? - jax-rs

Question

Im Try to create schedule job sample, buy task dont execute.
what's wrong?
#ApplicationScoped
public class CustomApplication extends Application {
#Override
public Set<Class<?>> getClasses() {
Set<Class<?>> classes = new HashSet<Class<?>>();
classes.add(FileService.class);
return classes;
}
}
public class FileService {
public void schedulerFeature() throws InterruptedException {
Scheduling.fixedRateBuilder()
.delay(4)
.initialDelay(2)
.timeUnit(TimeUnit.SECONDS)
.task(inv -> {
System.out.println("Running in:" + Thread.currentThread().getName());
System.out.println("Every 4 seconds an action, with an initial delay");
})
.build();
Thread.sleep(12000);
}
}
Im Try to create schedule job sample, buy task dont execute.

Answer 1

I don't know which version of Helidon you're using, and hence I don't know which version of JAX-RS/Jakarta RESTful Web Services you're using. For simplicity and brevity, I will assume you are using Helidon 3.x and therefore Jakarta RESTful Web Services 3.0.0.
This is not a Helidon question, but rather a basic JAX-RS/Jakarta RESTful Web Services question. You are really asking: "Why is my FileService class not instantiated by Jersey?"
Checking the documentation for Application#getClasses(), we can see that it reads: "Get a set of root resource, provider and feature classes." Your FileService class does not meet any of these requirements so it is simply ignored.
Guessing some more: I see you use the word "feature" in your example. This suggests that perhaps you want this class to actually be a true Jakarta RESTful Web Services Feature. Once again, the documentation here will tell you what you need to know to do next.

Answer 2

I revised my application and i had imported wrong maven lib. To schedule a job It is necessary import microprofile scheduling maven artifact:
<dependency>
<groupId>io.helidon.microprofile.scheduling</groupId>
<artifactId>helidon-microprofile-scheduling</artifactId>
<version>3.0.2</version>
</dependency>
import java.util.HashSet;
import java.util.Set;
#ApplicationScoped
public class CustomApplication extends Application {
#Override
public Set<Class<?>> getClasses() {
Set<Class<?>> classes = new HashSet<Class<?>>();
classes.add(FileService.class);
return classes;
}
}
import io.helidon.microprofile.scheduling.Scheduled;
import jakarta.enterprise.context.ApplicationScoped;
/**
* File service.
*/
#ApplicationScoped
public class FileService {
#Scheduled("0/2 * * * * ? *")
//#FixedRate(1)
public void schedulerFeature() {
System.out.println("Running");
}
}