遇到了MismatchedInputException异常。在这里搜索了很多问题，但大多数都是JSONMappingException。我不明白它们是否相同或不同。
以下是实体：
@Entity
@Table
@NamedQueries({
@NamedQuery(name="User.findAll", query="SELECT u FROM User u"),
@NamedQuery(name="User.findByEmail", query="SELECT u FROM User u WHERE u.email=:pEmail")
})
public class User {
@Id
@GenericGenerator(name = "idGenerator", strategy = "uuid2")
@GeneratedValue(generator = "idGenerator")
private String id;
private String firstName;
private String lastName;
@Column(unique=true)
private String username;
@Column(unique=true)
private String email;
private String password;
private String role;
}
在所有getter和setter都准备就绪的情况下，以下是控制器映射函数：
@RequestMapping(method = RequestMethod.POST, produces = MediaType.APPLICATION_JSON_UTF8_VALUE, consumes = MediaType.APPLICATION_JSON_UTF8_VALUE)
public User create(@RequestBody User user) {
return service.create(user);
}
以下是服务内容：
@Override
@Transactional
public User create(User user) {
User existing = repository.findByEmail(user.getEmail());
if(existing == null){
repository.create(user);
}
return user;
}
以下是代码库：
@Override
public User findByEmail(String email) {
TypedQuery<User> query = em.createNamedQuery("User.findByEmail", User.class);
query.setParameter("pEmail", email);
List<User> users = query.getResultList();
if(users != null && users.size()==1){
return users.get(0);
}
return null;
}
@Override
public User create(User user) {
em.persist(user);
return user;
}
以下是我使用的依赖项:
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.9.0.pr2</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>5.2.9.Final</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>6.0.6</version>
</dependency>
我正在通过Postman进行测试，尚未创建前端页面。以下是我发送的JSON：
[{
"firstName": "hgf",
"lastName": "frew",
"username": "erf",
"email": "bgghjk",
"password": "bgte",
"role": "trrere"
}
]
最后，以下是控制台日志记录：
Thu May 11 13:56:43 CDT 2017 WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification.
May 11, 2017 1:57:52 PM org.springframework.web.servlet.mvc.support.DefaultHandlerExceptionResolver handleHttpMessageNotReadable
WARNING: Failed to read HTTP message: org.springframework.http.converter.HttpMessageNotReadableException: Could not read document: Can not deserialize instance of priyanka.movieflix.entity.User out of START_ARRAY token
at [Source: (PushbackInputStream); line: 1, column: 1]; nested exception is com.fasterxml.jackson.databind.exc.MismatchedInputException: Can not deserialize instance of priyanka.movieflix.entity.User out of START_ARRAY token
at [Source: (PushbackInputStream); line: 1, column: 1]
我不确定是什么原因造成了这个异常。当我启动应用程序时，表在数据库中被正确地创建，并且我也能在GET请求中正确地获取数据。