NoSuchMethodError: java.lang.Long.hashCode

After checking the compiled AbstractORM class I found the problem: newer Kotlin versions generate a different code for that line

getId().hashCode()

Kotlin 1.1.2 generates the following code:

Long.valueOf(this.getId()).hashCode()

while newer versions of Kotlin generate this other code:

Long.hashCode(this.getId())

The problem is that this static method Long.hashCode(long) in Android is only available since API 24 (Android 7.0), while I'm testing on an Android device that has version 4.1 (API 16).

I'm temporarily fixing by calculating the hash code manually although I've opened an issue here.

override fun hashCode() = (getId() xor getId().ushr(32)).toInt()

As commented on the issue, switching to Java 1.6 target for the Kotlin compiler generates the old compatible code.

enter image description here

PS: I'm not 100% sure about those Kotlin versions, please take with a grain of salt.


Overriding the hashCode() function, as m0skit0 suggested, worked for me. I implemented this:

override fun hashCode() : Int = id.toString().hashCode()

My Kotlin compiler setting in AndroidStudio is :

  • incremental compilation enabled
  • target JVM ver. 1.6

Tags:

Android

Intellij Idea

Kotlin

Recent Posts