java - 简单的 Spring @CreatedDate 注释对我不起作用
问题描述
我正在尝试运行如下的简单示例,但出现错误。
我正在使用@CreatedDate。但是,当我使用 Rest 端点保存 Student 对象时,它不会创建日期并引发给定的异常。
在我的休息终点,我有
@PostMapping("/students")
public Student createStudent(@Valid @RequestBody Student student){
return studentRepository.save(student);
}
这是我的实体...
@Entity
@Table(name = "students")
@EntityListeners(AuditingEntityListener.class)
@JsonIgnoreProperties(value = {"createdAt", "updatedAt"}, allowGetters = true)
public class Student implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
@NotBlank
private String name;
@NotBlank
private String surname;
@Column(nullable = false, updatable = false)
@Temporal(TemporalType.TIMESTAMP)
@CreatedDate
private Date createdAt;
@Column(nullable = false)
@Temporal(TemporalType.TIMESTAMP)
@LastModifiedDate
private Date updatedAt;
错误:
2018-06-20 21:43:40.821 DEBUG 8844 --- [nio-8080-exec-1] org.hibernate.SQL
: select next_val as id_val from hibernate_sequence for update
2018-06-20 21:43:40.874 DEBUG 8844 --- [nio-8080-exec-1] org.hibernate.SQL : update hibernate_sequence set next_val= ? where next_val=?
2018-06-20 21:43:40.971 DEBUG 8844 --- [nio-8080-exec-1] org.hibernate.SQL : insert into students (created_at, name, surname, updated_at, id) values (?, ?, ?, ?, ?)
2018-06-20 21:43:40.978 TRACE 8844 --- [nio-8080-exec-1] o.h.type.descriptor.sql.BasicBinder : binding parameter [1] as [TIMESTAMP] - [null]
2018-06-20 21:43:40.979 TRACE 8844 --- [nio-8080-exec-1] o.h.type.descriptor.sql.BasicBinder : binding parameter [2] as [VARCHAR] - [Shilpa]
2018-06-20 21:43:40.980 TRACE 8844 --- [nio-8080-exec-1] o.h.type.descriptor.sql.BasicBinder : binding parameter [3] as [VARCHAR] - [Manware]
2018-06-20 21:43:40.980 TRACE 8844 --- [nio-8080-exec-1] o.h.type.descriptor.sql.BasicBinder : binding parameter [4] as [TIMESTAMP] - [null]
2018-06-20 21:43:40.981 TRACE 8844 --- [nio-8080-exec-1] o.h.type.descriptor.sql.BasicBinder : binding parameter [5] as [BIGINT] - [3]
2018-06-20 21:43:41.003 WARN 8844 --- [nio-8080-exec-1] o.h.engine.jdbc.spi.SqlExceptionHelper : SQL Error: 1048, SQLState: 23000
2018-06-20 21:43:41.003 ERROR 8844 --- [nio-8080-exec-1] o.h.engine.jdbc.spi.SqlExceptionHelper : Column 'created_at' cannot be null
2018-06-20 21:43:41.006 INFO 8844 --- [nio-8080-exec-1] o.h.e.j.b.internal.AbstractBatchImpl : HHH000010: On release of batch it still contained JDBC statements
2018-06-20 21:43:41.009 ERROR 8844 --- [nio-8080-exec-1] o.h.i.ExceptionMapperStandardImpl : HHH000346: Error during managed flush [org.hibernate.exception.ConstraintViolationException: could not execute statement]
2018-06-20 21:43:41.041 ERROR 8844 --- [nio-8080-exec-1] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.dao.DataIntegrityViolationException: could not execute statement; SQL [n/a]; constraint [null]; nested exception is org.hibernate.exception.ConstraintViolationException: could not execute statement] with root cause
com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Column 'created_at' cannot be null
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.8.0_112]
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:1.8.0_112]
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_112]
at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[na:1.8.0_112]
at com.mysql.jdbc.Util.handleNewInstance(Util.java:425) ~[mysql-connector-java-5.1.45.jar:5.1.45]
at com.mysql.jdbc.Util.getInstance(Util.java:408) ~[mysql-connector-java-5.1.45.jar:5.1.45]
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:936) ~[mysql-connector-java-5.1.45.jar:5.1.45]
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3973) ~[mysql-connector-java-5.1.45.jar:5.1.45]
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3909) ~[mysql-connector-java-5.1.45.jar:5.1.45]
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2527) ~[mysql-connector-java-5.1.45.jar:5.1.45]
解决方案
您可能会错过 Configuration 类中的 @EnableJpaAuditing 注释,该注释在 Spring JPA 中启用审计。
推荐阅读
- java - 如何从一个由多个动词和介词组成的复杂句子中获得主语、动词和宾语?
- python - while循环python可以只执行一次语句吗?
- php - FosElasticaBundle 填充序列化程序不索引所有字段
- python - 找不到满足要求 zipfile 的版本(来自版本:)
- r - 基于其他列表元素使用 lapply() 在列表数据框中添加新列
- node.js - 重定向到根 url,在节点 js 中传递一些响应数据
- ocaml - Ocaml,二叉树的级别函数
- html - 如何使 Angular 组件出现在 HTML 模板中?
- angular - Angular:如何将一个数组复制到另一个数组?
- python - 继承的 c 'abstract' 方法也要检查其他继承的类,而不仅仅是子类