@Entity
public class User {
    @Id
    @GeneratedValue
    private Long id;
    private String firstName;
    private String lastName;
    @Column(unique = true, nullable = false)
    private String username;
    @Column(nullable = false)
    private String password;
    private String prevPass;
    @Column(nullable = false)
    private Organization organization;
    @ManyToMany
    @Column(nullable = false)
    private Set<Role> roles = new HashSet<>();
    @Column(nullable = false)
    private Boolean enabled = true;
    @Column(nullable = false, unique = true)
    private String email;
    private String position;
    public User() {
    }
}

@Entity
public class Role {
    @Id
    @GeneratedValue
    private Long id;
    @Column(unique = true, nullable = false)
    private String code;
    @Column(unique = true, nullable = false)
    private String title;
}

spring.datasource.url=jdbc:mysql://localhost:3306/test
spring.datasource.username=root
spring.datasource.password=sth
spring.jpa.hibernate.ddl-auto=update

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.3.2.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>
<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <optional>true</optional>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-tomcat</artifactId>
        <scope>provided</scope>
    </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>
</dependencies>

spring.jpa.hibernate.ddl-auto=create
和
spring.jpa.hibernate.ddl-auto=create-drop

2020-08-10 22:52:14.139  INFO 10011 --- [           main] a.b.c.abc          : Starting abc on user with PID 10011 
2020-08-10 22:52:14.139  INFO 10011 --- [           main] a.b.c.abc          : No active profile set, falling back to default profiles: default
2020-08-10 22:52:15.339  INFO 10011 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data JPA repositories in DEFERRED mode.
2020-08-10 22:52:15.370  INFO 10011 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 23ms. Found 0 JPA repository interfaces.
2020-08-10 22:52:16.292  INFO 10011 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2020-08-10 22:52:16.307  INFO 10011 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2020-08-10 22:52:16.307  INFO 10011 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.37]
2020-08-10 22:52:16.495  INFO 10011 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2020-08-10 22:52:16.495  INFO 10011 --- [           main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 2180 ms
2020-08-10 22:52:16.886  INFO 10011 --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Initializing ExecutorService 'applicationTaskExecutor'
2020-08-10 22:52:16.948  INFO 10011 --- [         task-1] o.hibernate.jpa.internal.util.LogHelper  : HHH000204: Processing PersistenceUnitInfo [name: default]
2020-08-10 22:52:17.011  WARN 10011 --- [           main] JpaBaseConfiguration$JpaWebConfiguration : spring.jpa.open-in-view is enabled by default. Therefore, database queries may be performed during view rendering. Explicitly configure spring.jpa.open-in-view to disable this warning
2020-08-10 22:52:17.042  INFO 10011 --- [         task-1] org.hibernate.Version                    : HHH000412: Hibernate ORM core version 5.4.18.Final
2020-08-10 22:52:17.378  INFO 10011 --- [         task-1] o.hibernate.annotations.common.Version   : HCANN000001: Hibernate Commons Annotations {5.1.0.Final}
2020-08-10 22:52:17.724  INFO 10011 --- [         task-1] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Starting...
2020-08-10 22:52:18.251  INFO 10011 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
2020-08-10 22:52:18.258  INFO 10011 --- [           main] DeferredRepositoryInitializationListener : Triggering deferred initialization of Spring Data repositories…
<details>
<summary>英文:</summary>
I`m new to Spring Boot and trying to create tables from my entities in MySQL database, but unfortunately nothing is created after running my application. Here is my code:
**User.java**

private String firstName;
private String lastName;
@Column(unique = true, nullable = false)
private String username;
@Column(nullable = false)
private String password;
private String prevPass;
@Column(nullable = false)
private Organization organization;
@ManyToMany
@Column(nullable = false)
private Set<Role> roles = new HashSet<>();
@Column(nullable = false)
private Boolean enabled = true;
@Column(nullable = false, unique = true)
private String email;
private String position;
public User() {
}

**Role.java**

@Column(unique = true, nullable = false)
private String code;
@Column(unique = true, nullable = false)
private String title;

**application.properties**

**pom.xml dependencies**

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.3.2.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>
<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <optional>true</optional>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-tomcat</artifactId>
        <scope>provided</scope>
    </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>
</dependencies>

I have also used

in my application.properties file. I have to mention that my entities are in the same package with the class containing **@SpringBootApplication** annotaion.
Here is the log:

Can anyone help me please?
</details>
# 答案1
**得分**: 1
以下是翻译好的内容：
1. 运行类应该具有`@SpringBootApplication`，或者至少其中一个配置类应该具有`@EnableAutoConfiguration`。
2. 您不需要将tomcat作为依赖项。
3. 您可以更新您的pom文件以显示Spring Boot的父级。
<details>
<summary>英文:</summary>
it might be helpful to do the following:
 1. Running class should have `@SpringBootApplication` or at least one
    of your Configuration classes should have `@EnableAutoConfiguration`
    over it.
 2. You don&#39;t need tomcat as a dependency.
 3. Can you update your pom file to show us Spring Boot parent as well?
</details>
# 答案2
**得分**: 0
我终于解决了。无法创建表格，因为我没有使用一对一关系来设置外键。
<details>
<summary>英文:</summary>
I finally solve it. Tables could not be created because I hadn`t used One-to-One relationship for foreign key.
</details>