more detail log :
2021-04-30 12:43:44.076 [http-nio-8080-exec-2] WARN
o.a.w.c.u.o.c.CheckingObjectOutputStream.internalCheck - error delegating
to writeObject : Non-serializable lambda, path: /children/[write:1]/data
2021-04-30 12:43:44.078 [http-nio-8080-exec-2] WARN
I was using Kotlin 1.4.32 with wicket 8.11
but after upgrading to Kotlin 1.5.0 , it throws :
Caused by: java.io.NotSerializableException: Non-serializable lambda
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native
Method)
at