spring boot, jackson and localdate - spring-boot

Question

I use spring boot with mysql
in my application.properties
spring.jpa.generate-ddl=true
spring.jackson.serialization.write-dates-as-timestamps=false
In my build.gradle I have
compile('org.springframework.boot:spring-boot-starter-data-jpa')
compile('org.springframework.boot:spring-boot-starter-data-rest')
compile('org.springframework.boot:spring-boot-starter-web')
compile 'com.fasterxml.jackson.datatype:jackson-datatype-jsr310'
In my java class
import java.time.LocalDate;
#Entity
public class WebSite implements Serializable{
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long webSiteId;
private LocalDate date;
...
}
When this table is created,
date field is created like a TINYBLOB
Why is not a date

Answer 1

This is not an issue with Jackson, but rather that whatever you are using for ORM doesn't know how to convert a Java LocalDate to a MySQL Date.
There are two ways to do this. If you are using Hibernate, you simply include org.hibernate:hibernate-java8 in your dependencies.
Alternatively, if you want just use JPA, you need to create an Attribute Converter. For example:
#Converter(autoApply = true)
public class LocalDateAttributeConverter implements AttributeConverter<LocalDate, Date> {
#Override
public Date convertToDatabaseColumn(LocalDate locDate) {
return (locDate == null ? null : Date.valueOf(locDate));
}
#Override
public LocalDate convertToEntityAttribute(Date sqlDate) {
return (sqlDate == null ? null : sqlDate.toLocalDate());
}
}
The Attribute Converter will handle converting between a Java LocalDate and MySQL Date.
See: http://www.thoughts-on-java.org/persist-localdate-localdatetime-jpa/