Serializable crash demo

demo.kt

class A : Serializable {
    var b: B? = null
}

// without serializable
class B {
    
}


fun main(args: Array<String>) {

        val a = A()
        val oos = ObjectOutputStream(ByteArrayOutputStream())
        oos.writeObject(a)
        oos.close() //ok



        val a2 = A()
        a2.b = B() // put an non serializable object
        val oos2 = ObjectOutputStream(ByteArrayOutputStream())
        oos2.writeObject(a2)
        oos2.close() //gg

}