Good evenning i no longer have a solution ..Ive been hesitating to ask for help but Im litteraly at a dead end . Im working on a Spring boot 2.0.5 Spring MVC 5.0.9, ThymeLeaf 3.0.9 project that needs to be delievered in few weeks ..I have encountered a problem for some weeks now ...did my research and tried every possible solution and I still have the same problem . In Fact, my controller does not bind my model variables to my view ...it always renders "EL1007E: Property or field 'fieldName' cannot be found on null" .. Ive litteraly tried everything(since my code is just fine )..
- upgrading and downgrading JDK/JRE and matching them with eclipse version worked once,got me the information i needed but then got the same issue back .
 Using ModelAndView instead of String for rendreding web pages
mvn clean/mvn install /mvn dependency:resolve ...every command i found helpfull
- deleting the ./m2 repository for unnecessary dependencies
 - even setting a new workspace ..compiling debugging and im really stuck .. can you give me some advice please !!
 
<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org"
 data-layout-decorate="~{index}">
<head>
<meta charset="UTF-8" />
<title>Page test</title>
</head>
<body>
 <div data-layout-fragment="content">
  <div class="container">
   <div class="row">
    <div class="col-sm-6" align="center">
     <form th:action="@{/consulter}" method="get"
      th:object="${paramSociete}">
      <input type="text" name="nomSociete" class="form-control"
       placeholder="AMEN BANK" />
      <button type="submit">Clique moi !!</button>
     </form>
     <br /> <br /> <br /> <br />
     <div>
      <div>
       <label>Nom Banque :</label><Label th:inline="text">
        [[${paramSociete.nomSociete}]]</Label>
      </div>
      <div>
       <label>Reference msg:</Label><Label th:inline="text">[[${paramSociete.initialMsg}]]</Label>
      </div>
      <div>
       <label>chemin dacces:</label> <Label th:inline="text">[[${paramSociete.pathMsgEmis}]]</Label>
      </div>
     </div>
    </div>
   </div>
  </div>
 </div>
</body>
</html>
@Controller
public class ParamSocieteController {
    @Autowired
    private ParamSocieteServiceImpl societeServiceImpl;
    @Autowired
    public void setSocieteServiceImpl(ParamSocieteServiceImpl societeServiceImpl) {
        this.societeServiceImpl = societeServiceImpl;
    }
    @RequestMapping(value="/")
    public String showTest() {
        System.out.println("Here we go !!");
        return "ThymeTest";
    }
    @RequestMapping(value = "/consulter")
    public String afficherAmenBank(Model model, String nomSociete) {
        ParamSociete societe = societeServiceImpl.findSociete(nomSociete);
        if (societe == null) {
            model.addAttribute("paramSociete", new ParamSociete());
        } else {
            model.addAttribute("nomSociete", nomSociete);
            model.addAttribute("paramSociete", societe);
            System.out.println(societe.getNomSociete());
            System.out.println(societeServiceImpl.findSociete(societe.getNomSociete()).toString());
        }
        return "ThymeTest";
    }
}
so i did nothing in my controller but did this in my view : I tested if my object existed with th:if
<div th:if="${paramSociete}">
                    <div>
                        <label>Nom Banque :</label><Label th:inline="text">
                            [[${paramSociete.nomSociete}]]</Label>
                    </div>
                    <div>
                        <label>Reference msg:</Label><Label th:inline="text">[[${paramSociete.initialMsg}]]</Label>
                    </div>
                    <div>
                        <label>chemin dacces:</label> <Label th:inline="text">[[${paramSociete.pathMsgEmis}]]</Label>
                    </div>
                </div>