The constructor of the class "org.jbpm.bpmn2.xml.ItemDefinitionHandler" defines several valid peer classes for XML-Validation.

The definition is done by adding the class-object to a HashSet. Due to a missing import of "org.jbpm.bpmn2.core.Error" an error-definition in a BPMN2 process definition results in a validation exception, because the class-object links to "java.lang.Error".