When you work with Kotlin one of the biggest benefits is to get rid of the NullPointerException problem. I have been working with Kotlin for quite a bit, and learned about functional programming with Kotlin and tons of other benefits of this programming language, specially if you compare it with Java.īut, a few days ago I found something that could lead to some major problems when working with Kotlin and Spring Boot or Micronaut. Since I knew about this language it became my favorite programming language. Hence, the code becomes more robust.I love Kotlin. Also, it provides operators and functions to handle nullable variables safely. So, it enforces null safety checks at compile time. In brief, Kotlin’s null safety features help prevent runtime errors caused by null references. So, it helps prevent null pointer exceptions and improves the reliability of your code.
Similarly, Kotlin also provides the Elvis operator ( ?:), which allows you to provide a default value for a nullable variable if it is null. Therefore, if the variable is null, the expression returns null instead of throwing an exception. With this operator, you can call a method on a nullable variable without causing a null pointer exception. For example, the safe call operator ( ?.). Therefore, it makes it easy to handle nullable variables safely. So, the compiler will generate errors or warnings if you try to call a method or property on a nullable variable without first checking if it is null.įurther, Kotlin provides several null safety operators and functions.
When a variable is declared as nullable, the compiler enforces null safety checks to prevent null pointer exceptions at runtime. For example, String is a non-nullable type, while String? is a nullable type. However, nullable types can be explicitly declared by appending a ? to the type name. In other words, types cannot hold a null value. In general, the type system treats the two differently.īasically, by default, all types in Kotlin are non-nullable. Accordingly, in Kotlin, null safety is implemented through a type system.
In fact, Kotlin has built-in null safety features that help prevent runtime errors caused by null references.
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