The java.time.* classes introduced with Java 8 use java.time.Ser to serialize/deserialize them.
As a plugin developer, when I try to transfer java.time.Instant objects, I get the attached stacktrace.
While I can add this class to my own plugin's hudson.remoting.ClassFilter , the instructions at https://jenkins.io/blog/2018/01/13/jep-200/ tell me to create a PullRequest if the class is defined in Java Platform.
Here it is: https://github.com/jenkinsci/jenkins/pull/3542