apollo-openapi/src/main/java/com/ctrip/framework/apollo/openapi/client/service/AbstractOpenApiService.java/AbstractOpenApiService/checkNotEmpty
class AbstractOpenApiService:  protected void checkNotEmpty(String value, String name) {
    Preconditions.checkArgument(!Strings.isNullOrEmpty(value), name + " should not be null or empty");
  }