How to solve thymeleaf template parsing error
Question
I'm trying to present a html to screen but I'm getting template parser error from thymeleaf. Here is my code and error:
index.html:
<body>
<h2>My ToDo List</h2>
<form action="/send-form-data" method="post" th:object="${myForm}">
<table>
<tr>
<td>Title:</td>
<td><input type="text" th:field="*{title}"/></td>
</tr>
<tr>
<td>Decription:</td>
<td><input type="text" th:field="*{description}"/></td>
</tr>
</table>
@Controller public class TodolistController { @RequestMapping(value = { "/display-form", "/index.html" }, method = RequestMethod.GET) public ModelAndView displayForm() { ModelAndView mv = new ModelAndView("index"); mv.addObject("myForm", new MyModel()); return mv; }
}
MyModel:
public class MyModel { private String title; private String description; public String getTitle() { return title; } public void setTitle(String title) { this.title = title; } public String getDescription() { return description; } public void setDescription(String description) { this.description = description; }
}
Error:
Caused by: org.attoparser.ParseException: Error during execution of processor 'org.thymeleaf.spring5.processor.SpringInputGeneralFieldTagProcessor' (template: "index" - line 15, col 28) Caused by: java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'formData' available as request attribute
I tried something but not helped. When I delete the inputs from HTML it works finely so problem is about matching thymeleaf fields with MyModel variables but I couldn't solve.
2 answers
solution1
0 ACCPTED 2022-05-06 20:26:57
I have tried your program, and I consider that you entered a wrong url in your browser. Because there is nothing wrong in your code.
According to your controller:
@RequestMapping(value = { "/display-form", "/index.html" }, method = RequestMethod.GET)
Please make sure your browser's url is:
<host>:<port>/<context-path>/index.html or <host>:<port>/<context-path>/display-form
instead of <host>:<port>/<context-path>/ .
The problem is, <host>:<port>/<context-path>/ is the default welcome page and Spring directly renders your index.html without passing through your Controller. This is why you got a IllegalStateException with BindingResult issue.
But if you entered a correct url path, then you will see expected page:
solution2
0 2022-05-06 22:29:56
Just from the error message I would assume the target object you want to fill is missing or the way you currently provide it does not work. You can adjust your controller method to look like
@Controller
public class TodolistController {
@RequestMapping(value = { "/display-form", "/index.html" }, method = RequestMethod.GET)
public String displayForm(Model model) {
model.addAttribute("myForm", new MyModel());
return "index";
}
Assuming your index.html is located in resources/templates
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