No target validator set | Spring Boot Application on Google App Engine

The example seems to have problem. When starting the app on GAE an error like that is printed. Caused by "no target validator set". On local google app engine it is working. Any help?

[s~hsr-cloud-solutions-work/20180511t100939.409639534574068310].: 2018-05-11 08:12:19.222 WARN 1 --- [RequestD8018BA4] ationConfigEmbeddedWebApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.context.ApplicationContextException: Unable to start embedded container; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'cxfServletRegistration' defined in class path resource [org/apache/cxf/spring/boot/autoconfigure/CxfAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.boot.web.servlet.ServletRegistrationBean]: Factory method 'cxfServletRegistration' threw exception; nested exception is java.lang.IllegalStateException: No target Validator set

O relatório não fornece nenhum arquivo do repositório nem teste para começar. Reproduza a aplicação Spring Boot no Google App Engine e compare-a com a execução local funcional do App Engine, concentrando-se no registro do servlet CXF e na falha de inicialização reportada "No target Validator set". Considera-se concluído quando a aplicação iniciar com sucesso no Google App Engine sem essa exceção.

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