I am playing a little bit with kotlin jupyter and I am getti

Question

I am playing a little bit with kotlin jupyter and I am getting exception after simple `typealias Matrix = List lt List lt Double gt gt ` Crash is in thread It is of course working if I define it as a class

Michal Harakal · Answer

```class kotlin reflect jvm internal impl serialization deserialization descriptors DeserializedTypeAliasDescriptor cannot be cast to class kotlin reflect jvm internal impl descriptors ClassDescriptor kotlin reflect jvm internal impl serialization deserialization descriptors DeserializedTypeAliasDescriptor and kotlin reflect jvm internal impl descriptors ClassDescriptor are in unnamed module of loader app java lang ClassCastException class kotlin reflect jvm internal impl serialization deserialization descriptors DeserializedTypeAliasDescriptor cannot be cast to class kotlin reflect jvm internal impl descriptors ClassDescriptor kotlin reflect jvm internal impl serialization deserialization descriptors DeserializedTypeAliasDescriptor and kotlin reflect jvm internal impl descriptors ClassDescriptor are in unnamed module of loader app at kotlin reflect jvm internal KClassImpl$Data$nestedClasses$2 invoke KClassImpl kt 102 at kotlin reflect jvm internal KClassImpl$Data$nestedClasses$2 invoke KClassImpl kt 47 at kotlin reflect jvm internal ReflectProperties$LazySoftVal invoke ReflectProperties java 92 at kotlin reflect jvm internal ReflectProperties$Val getValue ReflectProperties java 31 at kotlin reflect jvm internal KClassImpl$Data getNestedClasses KClassImpl kt at kotlin reflect jvm internal KClassImpl getNestedClasses KClassImpl kt 240 at org jetbrains kotlinx jupyter codegen ClassAnnotationsProcessorImpl process ClassAnnotationsProcessorImpl kt 19 at org jetbrains kotlinx jupyter repl impl CellExecutorImpl$execute$1$2 invoke CellExecutorImpl kt 77 at org jetbrains kotlinx jupyter repl impl CellExecutorImpl$execute$1$2 invoke CellExecutorImpl kt 76 at org jetbrains kotlinx jupyter config LoggingKt catchAll logging kt 41 at org jetbrains kotlinx jupyter config LoggingKt catchAll$default logging kt 40 at org jetbrains kotlinx jupyter repl impl CellExecutorImpl execute CellExecutorImpl kt 76 at org jetbrains kotlinx jupyter repl CellExecutor$DefaultImpls execute$default CellExecutor kt 13 at org jetbrains kotlinx jupyter ReplForJupyterImpl$eval$1 invoke repl kt 373 at org jetbrains kotlinx jupyter ReplForJupyterImpl$eval$1 invoke repl kt 363 at org jetbrains kotlinx jupyter ReplForJupyterImpl withEvalContext repl kt 348 at org jetbrains kotlinx jupyter ReplForJupyterImpl eval repl kt 363 at org jetbrains kotlinx jupyter ProtocolKt$shellMessagesHandler$res$1 invoke protocol kt 291 at org jetbrains kotlinx jupyter ProtocolKt$shellMessagesHandler$res$1 invoke protocol kt 290 at org jetbrains kotlinx jupyter JupyterConnection$runExecution$execThread$1 invoke connection kt 162 at org jetbrains kotlinx jupyter JupyterConnection$runExecution$exec Thread$1 invoke connection kt 160 at kotlin concurrent ThreadsKt$thread$thread$1 run Thread kt 30 ```

Michal Harakal · Answer

Any idea Should I create a YT issue

rnett · Answer

Probably yeah or perhaps at <https github com Kotlin kotlin jupyter>

rnett · Answer

I can t tell which is causing it

altavir · Answer

Yes it seems to be a < C0BT46EL8|scripting> bug cc < ilya chernikov>

ilya.chernikov · Answer

I m not able to reproduce it with a regular script ``` cat m kts typealias Matrix = List lt List lt Double gt gt val m Matrix = listOf listOf 0 1 println m kotlin m kts 0 1 ``` as well as in the default REPL so please report to first cc < Ilya Muradyan>

Ilya Muradyan · Answer

< ilya chernikov> it fails on calling ` scriptInstance class nestedClasses` where `scriptInstance` is an instance of the above script So it may be an issue with class generation or something like that I ll investigate it a bit later

Ilya Muradyan · Answer

Created an issue <https youtrack jetbrains com issue KT 47650>