JenkinsBuildStepMigrator.java

public class CreateTicketBuildStep extends Builder implements SimpleBuildStep {

    public static class ConverterImpl extends XStream2.PassthruConverter<CreateTicketBuildStep> {
        private static final Logger LOGGER = LoggerFactory.getLogger(ConverterImpl.class);

        public ConverterImpl(XStream2 xstream) {
            super(xstream);
        }

        @Override
        protected void callback(CreateTicketBuildStep obj, UnmarshallingContext context) {
            if (obj.getTicket().getPackages() != null) {
                LOGGER.warn("[Plugin] Migration for create ticket build step needed...");
                List<PackageSource> sources = obj.getTicket().getPackageSources() == null
                        ? new ArrayList<>()
                        : obj.getTicket().getPackageSources();
                obj.getTicket().getPackages().forEach(pkg -> sources.add(new OnePackageSource(pkg)));

                obj.getTicket().setPackageSources(sources);
                obj.getTicket().setPackages(null);
                LOGGER.info("[Plugin] " +
                        "Migration for create ticket build step finished. Check old data monitor in global conf");

                OldDataMonitor.report(context, "1.8.0.plugin");
            }
        }
    }
    
}

pom.xml

<!--Для мигратора степа на новую версию-->
        <dependency>
            <groupId>org.jvnet.hudson</groupId>
            <artifactId>xstream</artifactId>
            <version>1.4.7-jenkins-1</version>
            <scope>provided</scope>
        </dependency>