kotlin reflection on the jvm seems to be 100x slower than java reflection for some usecases. is that...

# reflect

[christophsturm]

kotlin reflection on the jvm seems to be 100x slower than java reflection for some usecases. is that a known issue?

[christophsturm]

people say reflection is slow, but things that take <1ms in java take 300ms on kotlin reflection

[christophsturm]

KClassImpl has an inner class Data and this class takes ages to build. and it is built lazily before any other reflection call is possible

[christophsturm]

1ms:

val instanceField = jClass.getDeclaredField("INSTANCE")
            val obj = instanceField.get(null)
            val contexts = jClass.getDeclaredMethod("getContext").invoke(obj)

300ms:

return kClass.declaredMemberProperties.single { it.name == "context"
 }.call(kClass.objectInstance) as RootContext

[udalov]

First access is slow, subsequent accesses shoudl be significantly faster. It’s a known issue https://youtrack.jetbrains.com/issue/KT-32198

[christophsturm]

Ok great. Like the ticket suggests it would be great if some simple use cases would work without initializing the inner data class