```class OnlyAudioRecorder public constructor(val ...

# announcements

[Ifvwm]

class OnlyAudioRecorder public constructor(val hadoopAddr: String, val kafkaAddr: String ){
 companion object{
  val instance:OnlyAudioRecorder by lazy (mode = LazyThreadSafetyMode.SYNCHRONIZED){
            OnlyAudioRecorder(hadoopAddr, kafkaAddr)
        }
    }
// why this hadoopAddr and kafkaAddr are not referenced?

[andylamax]

Because constructor parameters are not passed to the companion object

[Ifvwm]

@andylamax how I can pass them to companion object?

[Agi Maulana]

OnlyAudioRecorder and companion object actually these are different classes

[Agi Maulana]

companion object is not an inner class of OnlyAudioRecorder so the companion can not directly referencing any property in OnlyAudioRecorder

[Ifvwm]

@Agi Maulana is there a way could pass parameters between them?

[Agi Maulana]

there isn't, it seem you wanna instantiates the OnlyAudioRecorder, put the value of hadoopAddr and kafkaAddr into companion object's property.

[Animesh Sahu]

Companion objects are singleton, instantiated at the startup (or when JVM loads the classes) and live till the application exits.

[Animesh Sahu]

They can't be instantiated externally.

[Animesh Sahu]

I think you wanted to create a object instead of class with external setters to the field.

[Ifvwm]

I see, I find out I can visit companion object in class's initial, so I can pass class's parameter to it.