![]() If you want to expose a property as a static field in Java, you need to define a getter method in the companion object. The annotation can only be applied to methods and not to properties. Kotlin provides the annotation to expose the methods and fields in the companion object as static methods and fields in Java. This may cause issues when using a mixed Java and Kotlin codebase as method calls which are expected to be static won’t compile. ![]() The companion object is formed as a static inner class, but the methods inside are simple instance methods and not static themselves. In the example below, we may expect that the Kotlin compiler will compile the ‘isThisStatic’ method defined inside a companion object as a static method under the hood, but this is not the case. In Kotlin, static methods and fields are defined inside a companion object, which is similar to a Java static inner class. To resolve this issue, you can use Jackson’s annotations, such as or to customize the serialization behavior of Kotlin data classes: data class val id: val name: String However, Jackson uses these generated methods during serialization, which may result in unexpected behavior. For example, consider the following Kotlin data class: data class MyData(val id: Int, val name: String)īy default, Kotlin Data classes generate equals, hashCode, and toString methods that consider all properties, including val properties. Kotlin data classes, which are commonly used for modeling data in Kotlin, may have different default behavior with Jackson serialization compared to Java classes without the usage of the module 'jackson-module-kotlin’. Jackson is a popular JSON serialization/deserialization library used in Spring. In this article we will dive into the Kotlin-versus-Java saga and unveil some insights into navigating this exciting shift. The seasoned consultants that we are, we have been documenting this journey and decided to bring forth some more tips, tricks and pitfalls, which may help out fellow developers on their journeys to transition from Java to Kotlin. We at kreuzwerker have written a blog post documenting the learning curve with Kotlin (coming from a Java based development background), and have had the chance to speak about it at a webinar dedicated for the same. In the realm of modern software development, the battle between Java and Kotlin continues to captivate programmers.
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