how.java

public class MicronautFactory {
    private final ApplicationContext context = ApplicationContext.run();

    public TaskScheduler getTaskScheduler() {
        return context.getBean(TaskScheduler.class, Qualifiers.byName(TaskExecutors.SCHEDULED));
    }
}

public class HowToFetchTaskScheduler {


public String createTask(TaskDefinition definition){
    ....
    Class<Job> jobClass = .....;
    TaskScheduler taskScheduler = MicronautFactory.getTaskScheduler();
    taskSchedler.schedule(cronExpression, () -> {
       Job jobFromClass = jobClass.newInstance();
       jobFromClass.execute()
    })
    
}


}