package com.example

import android.util.Log

class ClassA {

    var iWantToUseThisFromTheInnerClass = "someValue"

    fun runThisToStart() {
        val classB = ClassB(InnerClassA::class.java)
        classB.doSomething()

    }

    inner class InnerClassA(text: String) {
        init {
            Log.d("ClassA", "Constructor invoked " + text)
        }
    }

}

package com.example

import java.lang.reflect.InvocationTargetException

class ClassB<T>(private var mModelClass: Class<T>) {

    val someText = "whatever"

    fun doSomething():T {
        try {
            val constructor = mModelClass.getConstructor(String::class.java)
            return constructor.newInstance(someText)
        } catch (e: NoSuchMethodException) {   // Throws this exception
            throw RuntimeException(e)
        } catch (e: InvocationTargetException) {
            throw RuntimeException(e)
        } catch (e: InstantiationException) {
            throw RuntimeException(e)
        } catch (e: IllegalAccessException) {
            throw RuntimeException(e)
        }
    }

}