Steps to Reproduce

happens in a zkspringboot application when using redis session caching

Current Result

deserializing a BinderImpl leads to an infinite recursion (StackOverFlow error) when static resources are loaded e.g. the progress animation

http://robert-nb:8080/zkau/web/4ce7da9a/zul/img/misc/progress-72.gif

Expected Result

no error

Debug Info

redis' eager session serialization mechanism will deserialize the session from the internal storage every time request.getSession() is called

indirectly this happens inside the BinderImpl.readObject method -> calling BinderImple.init() -> calling WebApps.getCurrent() which internally calls again request.getSession(), restarting the loop

side effects during deserialization as in this case can have hard to trace consequences.

Root Cause

side effect of ZK-1148
https://github.com/zkoss/zk/commit/6cb74fa85dffde9d247d177a6fa14e831bc4b3c2#diff-65189fcf1cc3be918b3654daf8895419R301

Workaround