无法启动Spring以自动创建数据库架构?mysql

我无法启动启动时自动启动数据库架构的Spring Boot。

这是我的application.properties：

spring.datasource.url=jdbc:mysql://localhost:3306/test spring.datasource.username=test spring.datasource.password= spring.datasource.driverClassName = com.mysql.jdbc.Driver

spring.jpa.database = MYSQL

spring.jpa.show-sql = true

spring.jpa.hibernate.ddl-auto = create spring.jpa.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect spring.jpa.hibernate.naming_strategy = org.hibernate.cfg.ImprovedNamingStrategy 这是我的Application.java：

@EnableAutoConfiguration @ComponentScan public class Application { public static void main(final String[] args){ SpringApplication.run(Application.class, args); } } 这是一个示例实体：

@Entity @Table(name = "survey") public class Survey implements Serializable {

private Long _id;

private String _name;

private List<Question> _questions;

/**
 * @return survey's id.
 */
@Id
@GeneratedValue(strategy = IDENTITY)
@Column(name = "survey_id", unique = true, nullable = false)
public Long getId() {
    return _id;
}

/**
 * @return the survey name.
 */
@Column(name = "name")
public String getName() {
    return _name;
}


/**
 * @return a list of survey questions.
 */
@OneToMany(mappedBy = "survey")
@OrderBy("id")
public List<Question> getQuestions() {
    return _questions;
}

/**
 * @param id the id to set to.
 */
public void setId(Long id) {
    _id = id;
}

/**
 * @param name the name for the question.
 */
public void setName(final String name) {
    _name = name;
}

/**
 * @param questions list of questions to set.
 */
public void setQuestions(List<Question> questions) {
    _questions = questions;
}

} 有什么想法我做错了吗？