Failed to inject scheduler dependency when using Spring Boot bootJar / fatJar

[skhro87]

Prerequisites

Please answer the following questions for yourself before submitting an issue. YOU MAY DELETE THE PREREQUISITES SECTION.

• I am running the latest version (I'm using 15.0.0)
• I checked the documentation and found no answer
• I checked to make sure that this issue has not already been filed

Current/Expected Behavior

I have a Spring Boot application with Spring Boot 2.6.5 and added com.github.kagkarlsson:db-scheduler-spring-boot-starter:15.0.0 and I'm successfully running multiple scheduled tasks.
I am now trying to add two simple APIs e.g. GET /scheduled_tasks and POST /scheduled_tasks/launch for Admin users to list/trigger the scheduled tasks.
However, I am struggling to inject the scheduler dependency into my controller/service.

I have first tried the following code:

@Service
class ScheduledTasksService {
    @Autowired
    private lateinit var scheduler: Scheduler

    fun index(): ScheduledTasksIndexResDto {
        return ScheduledTasksIndexResDto(
            tasks = scheduler.scheduledExecutions.map { execution ->
                ScheduledTasksIndexResItemDto(
                    task_name = execution.taskInstance.taskName
                )
            }
        )
    }

    fun launch(dtoReq: ScheduledTasksLaunchReqDto) {
        // find task
        val taskInstanceId = scheduler.scheduledExecutions.firstOrNull {
            it.taskInstance.taskName == dtoReq.task_name
        }
            ?.taskInstance
            ?: throw ResponseStatusException(HttpStatus.BAD_REQUEST, "unknown task name ${dtoReq.task_name}")

        // trigger once
        scheduler.reschedule(taskInstanceId, Instant.now())
    }
}

which results in

***************************
APPLICATION FAILED TO START
***************************

Description:

Field schedulerClient in backend.services.ScheduledTasksService required a bean of type 'com.github.kagkarlsson.scheduler.SchedulerClient' that could not be found.

The injection point has the following annotations:
	- @org.springframework.beans.factory.annotation.Autowired(required=true)


Action:

Consider defining a bean of type 'com.github.kagkarlsson.scheduler.SchedulerClient' in your configuration.

I have also tried to use a custom BeanUtil to load the scheduler, as suggested in this issue :

@Service
class ScheduledTasksService() {
    fun index(): ScheduledTasksIndexResDto {
        val scheduler = BeanUtil.getBean(Scheduler::class.java)

        return ScheduledTasksIndexResDto(
            tasks = scheduler.scheduledExecutions.map { execution ->
                ScheduledTasksIndexResItemDto(
                    task_name = execution.taskInstance.taskName
                )
            }
        )
    }

    fun launch(dtoReq: ScheduledTasksLaunchReqDto) {
        val scheduler = BeanUtil.getBean(Scheduler::class.java)

        // find task
        val taskInstanceId = scheduler.scheduledExecutions.firstOrNull {
            it.taskInstance.taskName == dtoReq.task_name
        }
            ?.taskInstance
            ?: throw ResponseStatusException(HttpStatus.BAD_REQUEST, "unknown task name ${dtoReq.task_name}")

        // trigger once
        scheduler.reschedule(taskInstanceId, Instant.now())
    }
}

This allows me to start the application, but when I actually try to call the API, I'm getting:

org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.github.kagkarlsson.scheduler.Scheduler' available\n\tat org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:351)\n\tat org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:342)\n\tat org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1175)\n\tat backend.util.BeanUtil.getBean(BeanUtil.kt:24)\n\tat 

The irritating thing is that when I run the application without bootJar, it works.
When I compile via bootJar, I get the errors above.

My bootJar configuration is the following:

tasks.getByName<org.springframework.boot.gradle.tasks.bundling.BootJar>("bootJar") {
    mainClass.set("backend.BackendApplication")
}

I am pretty sure it's a misconfiguration with the bootJar, but I can't figure out how to fix it.
I tried to search issues and discussions here, and googled for other information, but couldn't fix it.

I would highly appreciate if someone could point me in the right direction. 🙏🏻