JpaでStreamCorruptedExceptionを発生させずにデータを取得する方法を教えてください。

実現したいこと

・JPAでテーブルからデータを取得したい

前提

Spring bootとVue.jsを使ってWEBアプリをつくっているのですが、
以下のcountByPrefectureCdメソッドではテーブルからデータを取得出来るのですが、
findByPrefectureCdメソッドではテーブルからのデータの取得に失敗します。

Java
1@Repository
2public interface BoothRepository extends JpaRepository<Booth, String> {
3  int countByPrefectureCd(String prefectureCd);
4  List<Booth> findByPrefectureCd(String prefectureCd);
5}

JPAのメソッドでデータの取得を試みるとjava.io.StreamCorruptedException: invalid stream header: 32303233（ASCIIコードで2023）というエラーが発生します。
恐縮ですが正常にデータを取得する方法のご教示をお願いいたします。

発生している問題・エラーメッセージ

2023-03-23 12:21:06.210[0;39m [32mDEBUG[0;39m [35m1900[0;39m [2m---[0;39m [2m[nio-8080-exec-8][0;39m [36morg.hibernate.SQL                       [0;39m [2m:[0;39m 
    select
        booth0_.booth_id as booth_id1_0_,
        booth0_.address as address2_0_,
        booth0_.booth_category_cd as booth_ca3_0_,
        booth0_.booth_name as booth_na4_0_,
        booth0_.chome_cd as chome_cd5_0_,
        booth0_.city_cd as city_cd6_0_,
        booth0_.del_flg as del_flg7_0_,
        booth0_.prefecture_cd as prefectu8_0_,
        booth0_.reg_dt as reg_dt9_0_,
        booth0_.reg_process as reg_pro10_0_,
        booth0_.reg_user_id as reg_use11_0_,
        booth0_.role_id as role_id12_0_,
        booth0_.town_area_cd as town_ar13_0_,
        booth0_.upd_dt as upd_dt14_0_,
        booth0_.upd_process as upd_pro15_0_,
        booth0_.upd_user_id as upd_use16_0_,
        booth0_.version as version17_0_ 
    from
        booth booth0_ 
    where
        booth0_.prefecture_cd=?
[2m2023-03-23 12:21:06.211[0;39m [32mTRACE[0;39m [35m1900[0;39m [2m---[0;39m [2m[nio-8080-exec-8][0;39m [36mo.h.type.descriptor.sql.BasicBinder     [0;39m [2m:[0;39m binding parameter [1] as [VARCHAR] - [01]
[2m2023-03-23 12:21:06.235[0;39m [32m INFO[0;39m [35m1900[0;39m [2m---[0;39m [2m[nio-8080-exec-8][0;39m [36mcom.koikeya.rotten.app.LogAspect        [0;39m [2m:[0;39m End:public abstract java.util.List com.koikeya.rotten.domain.repository.BoothRepository.findByPrefectureCd(java.lang.String)
[2m2023-03-23 12:21:06.235[0;39m [32m INFO[0;39m [35m1900[0;39m [2m---[0;39m [2m[nio-8080-exec-8][0;39m [36mcom.koikeya.rotten.app.LogAspect        [0;39m [2m:[0;39m End:public java.util.List com.koikeya.rotten.domain.service.impl.FetchListInfoServiceImpl.fetchListInfo(java.lang.String)
[2m2023-03-23 12:21:06.236[0;39m [32m INFO[0;39m [35m1900[0;39m [2m---[0;39m [2m[nio-8080-exec-8][0;39m [36mcom.koikeya.rotten.app.LogAspect        [0;39m [2m:[0;39m End:public java.lang.String com.koikeya.rotten.app.DisplayListController.displayList(java.lang.String,org.springframework.ui.Model)
[2m2023-03-23 12:21:06.244[0;39m [31mERROR[0;39m [35m1900[0;39m [2m---[0;39m [2m[nio-8080-exec-8][0;39m [36mo.a.c.c.C.[.[.[/].[dispatcherServlet]   [0;39m [2m:[0;39m Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.orm.jpa.JpaSystemException: could not deserialize; nested exception is org.hibernate.type.SerializationException: could not deserialize] with root cause

java.io.StreamCorruptedException: invalid stream header: 32303233
	at java.base/java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:943)
	at java.base/java.io.ObjectInputStream.<init>(ObjectInputStream.java:381)
	at org.hibernate.internal.util.SerializationHelper$CustomObjectInputStream.<init>(SerializationHelper.java:309)
	at org.hibernate.internal.util.SerializationHelper$CustomObjectInputStream.<init>(SerializationHelper.java:299)

該当のソースコード

html
1<template>
2  <p v-if="flag" class="ok">
3    {{ message }}
4  </p>
5  <div class="eight-regional-divisions">
6    <h2>北海道</h2>
7    <div class="Hokkaido">
8      <a href="/DisplayListController?prefectureCd=01">北海道</a>
9      {{ hokkaiDo }}件
10    </div>

Java
1@Controller
2@RequestMapping("/DisplayListController")
3public class DisplayListController {
4    /**
5     * 店舗リポジトリ
6     */
7    @Autowired
8    FetchListInfoService fetchListInfoService;
9
10    /**
11     * 一覧画面を表示する。
12     * @return 一覧画面名
13     */
14    @RequestMapping
15    public String displayList(@RequestParam(name = "prefectureCd") String prefectureCd, Model model) {
16        List<Booth> boothList = fetchListInfoService.fetchListInfo(prefectureCd);
17        model.addAttribute("boothList", fetchListInfoService.fetchListInfo(prefectureCd));
18        return UINameEnum.LIST.getUIName();
19    }
20}
21

Java
1@Service
2public class FetchListInfoServiceImpl implements FetchListInfoService {
3    /**
4     * 店舗
5     */
6    @Autowired
7    Booth booth;
8    /**
9     * 店舗リポジトリ
10     */
11    @Autowired
12    BoothRepository boothRepository;
13
14    @Override
15    public List<Booth> fetchListInfo(String prefectureCd) {
16        List<Booth> boothList = boothRepository.findByPrefectureCd(prefectureCd);
17        return boothList;
18    }
19}

Java
1@Repository
2public interface BoothRepository extends JpaRepository<Booth, String> {
3    /**
4     *　都道府県別の店舗数を取得する。
5     * @param prefectureCd 都道府県コード
6     * @return 店舗エンティティクラスリスト
7     */
8    int countByPrefectureCd(String prefectureCd);
9    /**
10     *　都道府県別の店舗数を取得する。
11     * @param prefectureCd 都道府県コード
12     * @return 店舗エンティティクラスリスト
13     */
14    List<Booth> findByPrefectureCd(String prefectureCd);
15}
16

Java
1@Data
2@Component
3@Entity
4@Table(name = "booth")
5public class Booth implements Serializable {
6    /**
7     * シリアルバージョンUID
8     */
9    private static final long serialVersionUID = 123456789L;
10    /**
11     * 都道府県コード
12     */
13    @NotBlank
14    @Length(max=2)
15    private String prefectureCd;

SQL
1-- 店
2--* RestoreFromTempTable
3create table booth (
4  prefecture_cd char(2) comment '都道府県コード'

pom.xml
1    </dependency>
2<!--     <dependency> -->
3<!--       <groupId>org.springframework.boot</groupId> -->
4<!--       <artifactId>spring-boot-starter-security</artifactId> -->
5<!--     </dependency> -->
6    <dependency>
7      <groupId>org.springframework.boot</groupId>
8      <artifactId>spring-boot-starter-thymeleaf</artifactId>
9    </dependency>
10    <dependency>
11      <groupId>org.springframework.boot</groupId>
12      <artifactId>spring-boot-starter-web</artifactId>
13    </dependency>
14
15    <dependency>
16      <groupId>org.projectlombok</groupId>
17      <artifactId>lombok</artifactId>
18      <optional>true</optional>
19    </dependency>
20    <dependency>
21      <groupId>org.springframework.boot</groupId>
22      <artifactId>spring-boot-starter-tomcat</artifactId>
23      <scope>provided</scope>
24    </dependency>
25    <dependency>
26      <groupId>org.springframework.boot</groupId>
27      <artifactId>spring-boot-starter-test</artifactId>
28      <scope>test</scope>
29    </dependency>
30    <dependency>
31      <groupId>org.springframework.security</groupId>
32      <artifactId>spring-security-test</artifactId>
33      <scope>test</scope>
34    </dependency>
35    <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-data-jpa -->
36    <dependency>
37      <groupId>org.springframework.boot</groupId>
38      <artifactId>spring-boot-starter-data-jpa</artifactId>
39    </dependency>
40    <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
41    <dependency>
42      <groupId>mysql</groupId>
43      <artifactId>mysql-connector-java</artifactId>
44    </dependency>
45    <!-- https://mvnrepository.com/artifact/org.webjars.npm/vue -->
46    <dependency>
47      <groupId>org.webjars.npm</groupId>
48      <artifactId>vue</artifactId>
49      <version>3.2.33</version>
50    </dependency>
51    <!-- https://mvnrepository.com/artifact/joda-time/joda-time -->
52    <dependency>
53      <groupId>joda-time</groupId>
54      <artifactId>joda-time</artifactId>
55      <version>2.10.14</version>
56    </dependency>
57    <!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-validator -->
58    <dependency>
59      <groupId>org.hibernate</groupId>
60      <artifactId>hibernate-validator</artifactId>
61      <version>6.0.17.Final</version>
62    </dependency>
63    <!-- Spring AOP -->
64    <dependency>
65        <groupId>org.springframework</groupId>
66        <artifactId>spring-aop</artifactId>
67    </dependency>
68    <!-- AspectJ -->
69    <dependency>
70        <groupId>org.aspectj</groupId>
71        <artifactId>aspectjweaver</artifactId>
72    </dependency>
73    <!-- https://mvnrepository.com/artifact/org.webjars/bootstrap -->
74    <dependency>
75      <groupId>org.webjars</groupId>
76      <artifactId>bootstrap</artifactId>
77      <version>4.5.2</version>
78    </dependency>
79
80  </dependencies>