How to open auto generated file level class - kotlin

Question

I am working on a project where I have some Kotlin-Java interoperability issue.
What I discovered is that in Kotlin all class level functions are wrapped in an auto generated class which names are the same as fileName+kt. I want this class to be open. What decompiled bytecode shows is:
public final class ExampleAppKt
Is there a way to get rid of the final keyword?

Answer 1

According to kotlinlang (Actually all the information is from there. I recommend to read it for more detailed info):
Kotlin has classes and their members final by default, which makes it inconvenient to use frameworks and libraries such as Spring AOP that require classes to be open. The all-open compiler plugin adapts Kotlin to the requirements of those frameworks and makes classes annotated with a specific annotation and their members open without the explicit open keyword.
You can enable all-open plugin via Gradle:
buildscript {
dependencies {
classpath "org.jetbrains.kotlin:kotlin-allopen:$kotlin_version"
}
}
apply plugin: "kotlin-allopen"
You can specify the annotation for classes to be compiled as open:
allOpen {
annotation("com.my.Annotation")
// annotations("com.another.Annotation", "com.third.Annotation")
}
If you use Maven, you can configure all-open as following:
<plugin>
<artifactId>kotlin-maven-plugin</artifactId>
<groupId>org.jetbrains.kotlin</groupId>
<version>${kotlin.version}</version>
<configuration>
<compilerPlugins>
<!-- Or "spring" for the Spring support -->
<plugin>all-open</plugin>
</compilerPlugins>
<pluginOptions>
<!-- Each annotation is placed on its own line -->
<option>all-open:annotation=com.my.Annotation</option>
<option>all-open:annotation=com.their.AnotherAnnotation</option>
</pluginOptions>
</configuration>
<dependencies>
<dependency>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-maven-allopen</artifactId>
<version>${kotlin.version}</version>
</dependency>
</dependencies>
</plugin>