https://github.com/jenkinsci/jenkins/pull/3122 changed the AbstractTaskListener in a non serialization friendly way.
For Jenkins this is not normally a problem as the same versions of classes will be used on both ends of a remoting endpoint, but custom derivatives may not have this luxury, or may use a different form of serialization other than XStream.
The simple fix that appears to work is to restore the serialVersionUID to the pre change version.
|Field||Original Value||New Value|
|Remote Link||This issue links to "PR (Web Link)" [ 20253 ]|
|Summary||restore class compatability for AbstractTaskListner||restore class compatibility for AbstractTaskListner|
|Summary||restore class compatibility for AbstractTaskListner||restore class compatibility for AbstractTaskListener|
|Resolution||Fixed [ 1 ]|
|Status||Open [ 1 ]||Resolved [ 5 ]|