Caused by: java.lang.UnsupportedOperationException: Refusing to marshal org.jvnet.hudson.test.TestCrumbIssuer for security reasons; see https://jenkins.io/redirect/class-filter/ at hudson.util.XStream2$BlacklistedTypesConverter.marshal(XStream2.java:546) at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:69) at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:58) at com.thoughtworks.xstream.core.AbstractReferenceMarshaller$1.convertAnother(AbstractReferenceMarshaller.java:84) at hudson.util.RobustReflectionConverter.marshallField(RobustReflectionConverter.java:265) at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:252) ... 39 more