I am the maintainer of the vrealize-automation-8 plugin. I noticed that when I installed it on a fresh, up-to-date Jenkins, it stopped working. Specifically, when trying to read a yaml-file, I get the following error:

 
hudson.remoting.ProxyException: org.yaml.snakeyaml.error.YAMLException: Class not found: com.vmware.vra.jenkinsplugin.pipeline.DeployFromCatalogExecution$Config
at org.yaml.snakeyaml.constructor.Constructor.getClassForNode(Constructor.java:664)
at org.yaml.snakeyaml.constructor.Constructor$ConstructYamlObject.getConstructor(Constructor.java:322)
at org.yaml.snakeyaml.constructor.Constructor$ConstructYamlObject.construct(Constructor.java:331)
Also: hudson.remoting.ProxyException: org.yaml.snakeyaml.error.YAMLException: Class not found: com.vmware.vra.jenkinsplugin.pipeline.DeployFromCatalogExecution$Config
at org.yaml.snakeyaml.constructor.Constructor.getClassForNode(Constructor.java:664)
at org.yaml.snakeyaml.constructor.Constructor$ConstructYamlObject.getConstructor(Constructor.java:322)
at org.yaml.snakeyaml.constructor.Constructor$ConstructYamlObject.construct(Constructor.java:331)
Caused: hudson.remoting.ProxyException: Can't construct a java object for tag:yaml.org,2002:com.vmware.vra.jenkinsplugin.pipeline.DeployFromCatalogExecution$Config; exception=Class not found: com.vmware.vra.jenkinsplugin.pipeline.DeployFromCatalogExecution$Config
in 'string', line 1, column 1:
count: 1
 

DeployFromCatalogExecution$Config is declared public and static and should be accessible. My dependencies in the POM-file related to this are as follows: 

}}{{<dependency>
  <groupId>io.jenkins.plugins</groupId>
  <artifactId>snakeyaml-api</artifactId>
  <version>1.27.0</version>
</dependency>

This issue seems to be popping up in at least one more plugin (kubernetes): https://issues.jenkins.io/browse/JENKINS-62995

Are there any changes I need to make to my code to make this work?

My plugin repo: https://github.com/jenkinsci/vrealize-automation-8-plugin