For example, a normal property can’t hold a null value and will show a compile error. One of the most common pitfalls in many programming languages, including Java, is that accessing a member of a null reference will result in a null reference exception.
Val obj = mapper.readValue(json, Incorrect:: class. In Kotlin, the type system distinguishes between references that can hold null (nullable references) and those that can not (non-null references). Kotlin's type system is aimed at eliminating the danger of null references, also known as The Billion Dollar Mistake.
Val field : = [ JacksonAutoConfiguration:: ValueClassJacksonTest var mapper : `value class inside collection should not affect outer class nullability`() """.trimIndent() fun Package jacksontest import .ObjectMapper import .kotlin.MissingKotlinParameterException import .Test import .assertThrows import .annotation.Autowired import .jackson.JacksonAutoConfiguration import .context.SpringBootTest import .ContextConfiguration import class ValueClass( val value : String)
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