Привет всем, кого я импортировал из начального проекта весенней загрузки Maven, чтобы он стал базовой структурой веб-приложения, над которым я работаю. но после запуска проекта я получаю ошибку whitelabel. Я испробовал все намеченные решения в net, но ни один из них не помог.
здесь моя ошибка 
структура приложения 
приложение. java
@SpringBootApplication
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
контроллер. java
@Controller
public class UploadController {
@GetMapping("/")
public String index() {
return "index";
}
@PostMapping("/upload-csv-file")
public String uploadCSVFile(@RequestParam("file") MultipartFile file, Model model) {
// validate file
if (file.isEmpty()) {
model.addAttribute("message", "Please select a CSV file to upload.");
model.addAttribute("status", false);
} else {
// parse CSV file to create a list of `User` objects
try (Reader reader = new BufferedReader(new InputStreamReader(file.getInputStream()))) {
// create csv bean reader
CsvToBean csvToBean = new CsvToBeanBuilder(reader)
.withType(Case.class)
.withIgnoreLeadingWhiteSpace(true)
.build();
// convert `CsvToBean` object to list of users
List<Case> users = csvToBean.parse();
// TODO: save users in DB?
// save users list on model
model.addAttribute("users", users);
model.addAttribute("status", true);
} catch (Exception ex) {
model.addAttribute("message", "An error occurred while processing the CSV file.");
model.addAttribute("status", false);
}
}
return "file-upload-status";
}
}
index. html
<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<title>Simulatore</title>
<!--Bootstrap 4-->
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css">
</head>
<body>
<div class="container py-5">
<div class="row">
<div class="col-6 mx-auto">
<h1>Simulatore Priorità CM-REVO </h1>
<form method="POST" th:action="@{/upload-csv-file}" enctype="multipart/form-data">
<div class="form-group mt-3">
<label for="file">Select a CSV file with Case Ids</label>
<input type="file" name="file" class="form-control-file" id="file" accept=".csv">
</div>
<button type="submit" class="btn btn-primary">Calculate Priorità</button>
</form>
</div>
</div>
</div>
</body>
</html>
пом. xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.2.2.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>spring-boot</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>spring-boot</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>com.example</groupId>
<artifactId>spring-boot</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>com.opencsv</groupId>
<artifactId>opencsv</artifactId>
<version>5.0</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
есть идеи?