SpringBoot Thymeleaf　値のエラー

java
1@Controller
2public class HelloController {
3
4    @GetMapping("/hello")
5    public String getHello(){
6        return "hello";
7    }
8
9    @PostMapping("/Hello")
10    public String postRequest(@RequestParam("text1")String str, Model model){
11
12        model.addAttribute("Sample", str);
13
14        return "helloResponse";
15    }
16}

HTML
1<!DOCTYPE html>
2<html xmlns:th="http://www.thymeleaf.org">
3
4<head>
5    <meta charset="UTF-8">
6    <title>Hello World</title>
7</head>
8<body>
9    <h1>Hello World</h1>
10    <form method="post" action="/hello">
11        好きな文字を入力：
12        <input type="text" name="text1" th:value="${text1_value}"/>
13        <input type="submit" value="クリック" />
14    </form>
15</body>
16</html>

HTML
1<!DOCTYPE html>
2<html xmlns:th="http://www.thymeleaf.org">
3<head>
4    <meta charset="UTF-8">
5</head>
6<body>
7  <h1>HelloResponse</h1>
8  <p th:text="${sample}"></p>
9</body>
10

pom.xml
1<?xml version="1.0" encoding="UTF-8"?>
2<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
3         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
4    <modelVersion>4.0.0</modelVersion>
5    <parent>
6        <groupId>org.springframework.boot</groupId>
7        <artifactId>spring-boot-starter-parent</artifactId>
8        <version>2.5.2</version>
9        <relativePath/> <!-- lookup parent from repository -->
10    </parent>
11    <groupId>com.example</groupId>
12    <artifactId>SpringSample</artifactId>
13    <version>0.0.1-SNAPSHOT</version>
14    <name>SpringSample</name>
15    <description>Demo project for Spring Boot</description>
16    <properties>
17        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
18        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
19        <java.version>1.8</java.version>
20        <thymeleaf.version>3.0.12.RELEASE</thymeleaf.version>
21        <thymeleaf-layout-dialect.version>2.1.2</thymeleaf-layout-dialect.version>
22        <thymeleaf-extras-java8time.version>3.0.0.RELEASE</thymeleaf-extras-java8time.version>
23    </properties>
24    <dependencies>
25        <dependency>
26            <groupId>org.springframework.boot</groupId>
27            <artifactId>spring-boot-starter-data-jdbc</artifactId>
28        </dependency>
29        <dependency>
30            <groupId>org.springframework.boot</groupId>
31            <artifactId>spring-boot-starter-thymeleaf</artifactId>
32        </dependency>
33        <dependency>
34            <groupId>org.springframework.boot</groupId>
35            <artifactId>spring-boot-starter-web</artifactId>
36        </dependency>
37
38        <dependency>
39            <groupId>org.springframework.boot</groupId>
40            <artifactId>spring-boot-devtools</artifactId>
41            <scope>runtime</scope>
42            <optional>true</optional>
43        </dependency>
44        <dependency>
45            <groupId>com.h2database</groupId>
46            <artifactId>h2</artifactId>
47            <scope>runtime</scope>
48        </dependency>
49        <dependency>
50            <groupId>org.projectlombok</groupId>
51            <artifactId>lombok</artifactId>
52            <optional>true</optional>
53        </dependency>
54        <dependency>
55            <groupId>org.springframework.boot</groupId>
56            <artifactId>spring-boot-starter-test</artifactId>
57            <scope>test</scope>
58        </dependency>
59    </dependencies>
60
61    <build>
62        <plugins>
63            <plugin>
64                <groupId>org.springframework.boot</groupId>
65                <artifactId>spring-boot-maven-plugin</artifactId>
66                <configuration>
67                    <excludes>
68                        <exclude>
69                            <groupId>org.projectlombok</groupId>
70                            <artifactId>lombok</artifactId>
71                        </exclude>
72                    </excludes>
73                </configuration>
74            </plugin>
75        </plugins>
76    </build>
77
78</project>
79