Spring boot: Post request without returning template?

Question

Java

I am using Thymeleaf library
I have a POST function:

@PostMapping("/add2Cart")
void addToCart(@RequestBody String str, HttpServletRequest request) {
        ...
}

JSON is passed from it with an Ajax request, but after the function is executed, an error occurs:

org.thymeleaf.exceptions.TemplateInputException: Error resolving template "add2Cart", template might not exist or might not be accessible by any of the configured Template Resolvers

Is it possible to process a post request without returning a template?

Answer 1

In essence, it is enough to mark the method with the @ResponseBody annotation so that the returned value is treated not as a template name, but as a response:

@PostMapping("/add2Cart")
@ResponseBody
void addToCart(@RequestBody String str, HttpServletRequest request) {
        ...
}

Judging by the terms and prepositions you use, you have a very vague idea of ​​what is really going on. First, addToCart is not a function, but a method. Secondly, you pass an ajax request to it, and json is returned from it. The next question is correct: "Is it possible to process a post request without returning a template?"
I don't understand the meaning of your last question. What exactly do you want? Where do you need to pass the java object to the method?