Hi there have a QQ let me know if this is not the right chan

Question

Hi there have a QQ let me know if this is not the right channel By calling lt string gt startsWith $$ I see some IllegalArgumentException reports coming from that Caused by java lang IllegalArgumentException at kotlin text StringsKt StringsJVMKt b StringsKt StringsJVMKt java at kotlin text StringsKt StringsJVMKt startsWith$default StringsKt StringsJVMKt java 195 I checked the code and dont see anything related and why this might be throwing such exception Unfortunately I dont have a sample string that is causing the issue

Michał Jurczyk · Answer

Are you calling that in Kotlin code or Java code thinking face

Joao Birk · Answer

calling from kotlin code

Michał Jurczyk · Answer

And I assume what you posted is the top of the stack trace and there is no additional comment thinking face Like Desired length 9000 is less than zero

Joao Birk · Answer

That is correct

Joao Birk · Answer

below that is just the class that actually called this and thats it

karelpeeters · Answer

Well what s at line `StringsJVMKt java 195`

karelpeeters · Answer

Also is that the full stacktrace not a part of it in the middle

Joao Birk · Answer

correct

Joao Birk · Answer

StringsJVMKt java 195 gt Suppress ACTUAL FUNCTION WITH DEFAULT ARGUMENTS public actual fun String startsWith prefix String ignoreCase Boolean = false Boolean if ignoreCase return this as java lang String startsWith prefix else return regionMatches 0 prefix 0 prefix length ignoreCase

karelpeeters · Answer

I can t find anything the only place `String` throws `IllegalArgumentException` is in the constructor when it encounters an invalid codepoints and you re not constructing a string here

Joao Birk · Answer

exactly i bumped into that method too

karelpeeters · Answer

A test string would be great simple smile

ilya.gorbunov · Answer

`IllegalArgumentException` can be thrown as a result of a failed null check of the incoming parameters the receiver string or the prefix string

Joao Birk · Answer

fun unsubscribe symbols List lt String gt symbols filterNot it startsWith $$ forEach

Joao Birk · Answer

so you saying that an element in that list is `String `

Joao Birk · Answer

if thats the case the call to unsubscribe would fail when passing the list param no with the IllegalArgumentException

karelpeeters · Answer

No you can t really typecheck the contents of a list at runtime generics are erased

Joao Birk · Answer

hmm true

Joao Birk · Answer

This was very helpful thank you all