解决template might not exist or might not be accessible by any of the configured Template Resolvers

org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet [spring] in context with path [/xxx] threw exception [Request processing failed; nested exception is org.thymeleaf.exceptions.TemplateInputException: Error resolving template \"后端路径/xx/xx\", template might not exist or might not be accessible by any of the configured Template Resolvers] with root cause
org.thymeleaf.exceptions.TemplateInputException: Error resolving template \"后端路径/xx/xx\", template might not exist or might not be accessible by any of the configured Template Resolvers
    at org.thymeleaf.TemplateRepository.getTemplate(TemplateRepository.java:245)

定位原因：

前端的Ajax里我写了这么一段

                dataType: \"json\",
                contentType: \'application/json;charset=UTF-8\',

要求返回Json形式的数据，但是后端的controller层我并没有设置返回格式，忘了在controller的方法上加@ResponseBody注释了。