GRAILS-11073 workaround

BootStrap.groovy

import grails.plugins.rest.client.RestBuilder
import org.springframework.http.converter.HttpMessageConverter
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter

class BootStrap {

  RestBuilder rest

  def init = { servletContext ->
    final mappingJackson2HttpMessageConverter = rest.restTemplate.messageConverters.find { HttpMessageConverter httpMessageConverter -> httpMessageConverter instanceof MappingJackson2HttpMessageConverter }
    if(mappingJackson2HttpMessageConverter) {
      rest.restTemplate.messageConverters.remove(mappingJackson2HttpMessageConverter)
    }
  }
  def destroy = {
  }
}