Cannot connect database using picocli and micronaut

Question

I using picocli connect database and build native images. I using micronaut connect to postgres get some data when i excute images native build by picocli. But i have problem when using entityManager. When i using entity manager using @Inject it always throw me exception

kotlin.UninitializedPropertyAccessException: lateinit property entityManager has not been initialized

By code bellow

@Singleton
class StudentRepository  {

    @Inject
    lateinit var entityManager: EntityManager


    @ReadOnly
    fun findAll(): List<Student?>? {
        var qlString = "SELECT * FROM Student as g"

        val query: TypedQuery<Student> = entityManager.createQuery(qlString, Student::class.java)
        return query.getResultList()
    }

}

Then service i call look like

@CommandLine.Command(name = "studentService", description = arrayOf("Student service"),mixinStandardHelpOptions = true)
@Singleton
class StudentService(): Runnable {
     @Inject
    lateinit var studentRepository: StudentRepository

 override fun run() {
        getAllStudent()
 }

 fun getAllStudent() {
     println("Count student ${studentRepository.findAll().size}")
  }

}

My application

@picocli.CommandLine.Command(
    name = "cli",
    description = ["Cli"],
    version = ["Cli"],
    mixinStandardHelpOptions = true,
    subcommands = [StudentService::class]
)
class MyApplication : Runnable {

    override fun run() {
        println("Begin start")
    }
}

fun main(args: Array<String>) {
    PicocliRunner.run(MyApplication::class.java, *args)
}

But if i using http client it work. https://dev.to/stack-labs/cli-applications-with-micronaut-and-picocli-4mc8 I don't know why cannot using entityManager . How to connect db using picocli