In Gradle, the kotlin-spring compiler plugin can be enabled by using buildscript with the allopen artifact, as shown here:

buildscript {
   dependencies {
   classpath "org.jetbrains.kotlin:kotlin-allopen:$kotlin_version"
   }
 }
 apply plugin: "kotlin-spring"

Alternatively, the plugin can be enabled using plugins as follows:

plugins {
   id "org.jetbrains.kotlin.plugin.spring" version "1.2.41"
 }

This plugin specifies the following annotations:

• @Component
• @Transactional
• @Async
• @Cacheable
• @SpringBootTest

The classes that are annotated with these annotations are made open and accessible to the Spring framework so that we can create proxy objects.