requireNonNull.kt

fun <T> T?.requireNonNull(id: String): T = this ?: throw NullPointerException("%s must be specified".format(id))

usage.kt

    @Test
    fun testRequireNonNull() {
        val isNull: String? = null
        val maybeNull: String? = "not really null"


        assertThatThrownBy { isNull.requireNonNull("isNull") }
            .isInstanceOf(NullPointerException::class.java)


        val notNull:String = maybeNull.requireNonNull("maybeNull")

    }