JPA无法反序列化Java 8 LocalDateTime

我使用的是Spring Boot 1.5.1，当我的实体类中有LocalDateTime字段时，只要我点击API，就会出现异常

MySQL dt列是TIMESTAMP

JPA是否无法本机反序列化LocalDateTime

执行GET请求时的控制台输出

 2017-03-02 22:00:18.797 ERROR 13736 --- [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.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: 20323031

预订。课程

package com.example.springboot.reservation;

import java.time.LocalDateTime;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;

// Model class 

@Entity
@Table(name="reservation")
public class Reservation {

    @Id
    private Long id;

    @Column
    private LocalDateTime dt;


    @Column(name="user_id")
    private Long userId;

    // Hibernate will convert camel case column names to snake case!!!
    // Don't use camelcase columns in DB
    @Column(name="party_size")
    private int partySize;

    public Reservation() {}

    public Reservation(Long id,  Long userId, int partySize) {
        this.id = id;

        this.userId = userId;
        this.partySize = partySize;
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public LocalDateTime getDt() {
        return dt;
    }

    public void setDt(LocalDateTime dt) {
        this.dt = dt;
    }

    public Long getUserId() {
        return userId;
    }

    public void setUserId(Long userId) {
        this.userId = userId;
    }

    public int getPartySize() {
        return partySize;
    }

    public void setPartySize(int partySize) {
        this.partySize = partySize;
    }

}

pom.xml

<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.1.RELEASE</version>
  </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>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

  <properties>
    <java.version>1.8</java.version>
  </properties>

org.springframework.boot
spring启动程序父级
1.5.1.1发布
org.springframework.boot
spring引导启动器数据jpa
org.springframework.boot
SpringBootStarterWeb
org.springframework.boot
弹簧靴开发工具
运行时
mysql
mysql连接器java
运行时
org.springframework.boot
弹簧起动试验
测试
1.8

您可以按如下所述编写转换器：

@Converter(autoApply = true)
public class MyLocalDateConverter implements AttributeConverter<java.time.LocalDate, java.sql.Date> {

   @Override
   public java.sql.Date convertToDatabaseColumn(java.time.LocalDate attribute) {
      return attribute == null ? null : java.sql.Date.valueOf(attribute);
   }

   @Override
   public java.time.LocalDate convertToEntityAttribute(java.sql.Date dbData) {
    return dbData == null ? null : dbData.toLocalDate();
   }
}

@转换器（autoApply=true）
公共类MyLocalDateConverter实现AttributeConverter{
@凌驾
public java.sql.Date convertToDatabaseColumn（java.time.LocalDate属性）{
返回属性==null？null:java.sql.Date.valueOf（属性）；
}
@凌驾
public java.time.LocalDate convertToEntityAttribute（java.sql.Date dbData）{
返回dbData==null？null:dbData.toLocalDate（）；
}
}

---

如果您没有使用JPA 2.0，这将有助于您使用LocalDateTime的

@Temporal

注释。

您可以在spring软件包中找到一些已烘焙的转换器：

org.springframework.data.jpa.convert.threeten.Jsr310JpaConverters

JDocs：

JPA2.1转换器将JSR-310类型转换为遗留日期。要激活这些转换器，请确保持久性提供程序通过将此类包含在映射类列表中来检测它们。在Spring环境中，您只需将此类的包（即org.springframework.data.jpa.convert.threeten）注册为要在LocalContainerEntityManagerFactoryBean上扫描的包

---

如果使用具有LocalDateTime支持的较新的hibernate-java8，则不需要转换器

<dependency>
  <groupId>org.hibernate</groupId>
  <artifactId>hibernate-java8</artifactId>
  <version>${hibernate.version}</version>
</dependency>

org.hibernate
hibernate-java8
${hibernate.version}

使用jpa转换器完成此任务。您能尝试在私有LocalDateTime dt上使用@Temporal（TemporalType.TIMESTAMP）吗；使用@Column>>注意，您需要这些导入1-导入javax.persistence.Temporal；2-导入javax.persistence.TemporalType；你不需要转换器。仅添加

hibernate-java8

依赖项。该示例显示了具有策展依赖项的POM。所以这不是一个正确的方法。它支持“SpringDataJPA1.8”。

org.springframework.data.jpa.convert.threeten.Jsr310JpaConverters

<dependency>
  <groupId>org.hibernate</groupId>
  <artifactId>hibernate-java8</artifactId>
  <version>${hibernate.version}</version>
</dependency>