Java Hibernate 5.3.6(JPA 2.1+;)上的InheritanceType.com中映射MySQL枚举与AttributeConverter:无枚举常量
我正在映射一个继承层次结构,如下所示: 这里的问题是,DB分别包含个人、俱乐部和竞技场的单字符枚举值“p”、“C”和“A”,但要使用的Java枚举值应该是个人、俱乐部和竞技场 这需要使用Java Hibernate 5.3.6(JPA 2.1+;)上的InheritanceType.com中映射MySQL枚举与AttributeConverter:无枚举常量,java,hibernate,jpa,enums,orm,Java,Hibernate,Jpa,Enums,Orm,我正在映射一个继承层次结构,如下所示: 这里的问题是,DB分别包含个人、俱乐部和竞技场的单字符枚举值“p”、“C”和“A”,但要使用的Java枚举值应该是个人、俱乐部和竞技场 这需要使用AttributeConverter来执行DB value-Java枚举转换(请参见下面的映射): 联系实体: @Entity @Table(name="Contacts") @Inheritance(strategy=InheritanceType.JOINED) public abstract class
AttributeConverter
来执行DB value-Java枚举转换(请参见下面的映射):
联系实体:
@Entity
@Table(name="Contacts")
@Inheritance(strategy=InheritanceType.JOINED)
public abstract class Contact extends BaseIdEntity
{
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
@Column
protected Integer id;
@Convert(converter=ContactTypeConverter.class) // <-- !!! ... see below
@Enumerated(EnumType.STRING)
@Basic(optional=false)
@Column
protected ContactType type; // actually a discriminator, but for JOINED inheritance, it is not required to annotate the class with @DiscriminatorColumn
...
}
俱乐部实体:
@Entity
@Table(name="Clubs")
public class Club extends Contact
{
private static final long serialVersionUID = 1L;
@Basic(optional=false)
@Column
private String name;
@Basic(optional=false)
@Column
private String code;
@Basic
@Column(name="website_url")
private String websiteUrl;
...
}
竞技场实体:
@Entity
@Table(name="Arenas")
public class Arena extends Contact
{
private static final long serialVersionUID = 1L;
@Basic(optional=false)
@Column
private String name;
@Basic
@Column
private Integer capacity;
...
}
联系人类型的属性转换器:
@Converter( autoApply = false )
public class ContactTypeConverter implements AttributeConverter<ContactType, String>
{
@Override
public String convertToDatabaseColumn( ContactType contactType )
{
System.out.println( "convertToEntityAttribute(" + contactType + ")" );
switch ( contactType )
{
case PERSON:
return "P";
case CLUB:
return "C";
case ARENA:
return "A";
default:
throw new IllegalArgumentException( "Unknown enum value: " + contactType );
}
}
@Override
public ContactType convertToEntityAttribute( String value )
{
System.out.println( "convertToEntityAttribute(\"" + value + "\")" );
switch ( value )
{
case "P":
return PERSON;
case "C":
return CLUB;
case "A":
return ARENA;
default:
throw new IllegalArgumentException( "Unknown DB value: " + value );
}
}
}
数据:
我咨询了许多来源,例如:
[主要]
所有人说的都一样,但都不起作用。加载我得到的人员列表时:
Caused by: java.lang.IllegalArgumentException: No enum constant net.bbstats.entity.ContactType.P
at java.lang.Enum.valueOf(Enum.java:238)
at org.hibernate.type.descriptor.java.EnumJavaTypeDescriptor.fromName(EnumJavaTypeDescriptor.java:84)
at org.hibernate.metamodel.model.convert.internal.NamedEnumValueConverter.toDomainValue(NamedEnumValueConverter.java:39)
at org.hibernate.metamodel.model.convert.internal.NamedEnumValueConverter.readValue(NamedEnumValueConverter.java:69)
at org.hibernate.type.EnumType.nullSafeGet(EnumType.java:250)
at org.hibernate.type.CustomType.nullSafeGet(CustomType.java:119)
at org.hibernate.type.AbstractType.hydrate(AbstractType.java:91)
at org.hibernate.persister.entity.AbstractEntityPersister.hydrate(AbstractEntityPersister.java:3007)
at org.hibernate.loader.Loader.loadFromResultSet(Loader.java:1746)
at org.hibernate.loader.Loader.instanceNotYetLoaded(Loader.java:1672)
at org.hibernate.loader.Loader.getRow(Loader.java:1561)
at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:731)
at org.hibernate.loader.Loader.processResultSet(Loader.java:990)
at org.hibernate.loader.Loader.doQuery(Loader.java:948)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:340)
at org.hibernate.loader.Loader.doList(Loader.java:2689)
at org.hibernate.loader.Loader.doList(Loader.java:2672)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2506)
at org.hibernate.loader.Loader.list(Loader.java:2501)
at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:504)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:395)
at org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:220)
at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1508)
at org.hibernate.query.internal.AbstractProducedQuery.doList(AbstractProducedQuery.java:1537)
at org.hibernate.query.internal.AbstractProducedQuery.list(AbstractProducedQuery.java:1505)
at org.hibernate.query.Query.getResultList(Query.java:135)
at net.bbstats.framework.service.Repository.findByNamedQuery(Repository.java:184)
at net.bbstats.framework.service.BaseEntityService.findByNamedQuery(BaseEntityService.java:382)
at net.bbstats.framework.service.BaseEntityService.findByNamedQuery(BaseEntityService.java:368)
at net.bbstats.framework.service.BaseEntityService.findByNamedQuery(BaseEntityService.java:344)
at net.bbstats.framework.service.BaseEntityService.findAllByQueryWithFetchGraph(BaseEntityService.java:300)
... 179 more
看这行:
java.lang.IllegalArgumentException:无枚举常量net.bbstats.entity.ContactType.p
不是真的正确转换或者根本不转换
问题:
这里怎么了?我几乎100%确信,映射是正确的
->这是一个Hibernate bug吗?是因为继承映射吗?可能不使用继承类型。是否已加入
在任何情况下,一个观察结果是,无论发生什么情况,属性转换器从未调用过,也就是说,在ContactTypeConverter中从未达到任何断点,也从未向控制台/日志打印任何系统输出
设置:WildFly 14.0.1.Final,Hibernate 5.3.6.Final,根据
JPA明确禁止使用带有标记为@Enumerated
属性的AttributeConverter
。因此,在使用AttributeConverter
方法时,请确保不要将属性标记为@Enumerated
请尝试从
Contact.type
中删除@Enumerated(EnumType.STRING)
。此操作有效。谢谢太神了但我真的不明白为什么。好的,@Convert
似乎是@Enumerated
的替代品,那么?这在规范中的任何地方都有定义吗?恶心,恶心。。。
@Converter( autoApply = false )
public class ContactTypeConverter implements AttributeConverter<ContactType, String>
{
@Override
public String convertToDatabaseColumn( ContactType contactType )
{
System.out.println( "convertToEntityAttribute(" + contactType + ")" );
switch ( contactType )
{
case PERSON:
return "P";
case CLUB:
return "C";
case ARENA:
return "A";
default:
throw new IllegalArgumentException( "Unknown enum value: " + contactType );
}
}
@Override
public ContactType convertToEntityAttribute( String value )
{
System.out.println( "convertToEntityAttribute(\"" + value + "\")" );
switch ( value )
{
case "P":
return PERSON;
case "C":
return CLUB;
case "A":
return ARENA;
default:
throw new IllegalArgumentException( "Unknown DB value: " + value );
}
}
}
CREATE TABLE `Contacts`(
`id` INT(11) NOT NULL AUTO_INCREMENT,
`type` ENUM('P', 'C', 'A') NOT NULL,
PRIMARY KEY (`id`));
CREATE TABLE `Arenas` (
`id` INT(11) NOT NULL,
`name` VARCHAR(50) NOT NULL,
`capacity` INT(11) NULL,
PRIMARY KEY (`id`),
CONSTRAINT `arenas_contacts_fk`
FOREIGN KEY (`id`)
REFERENCES `Contacts` (`id`)
ON DELETE CASCADE
ON UPDATE CASCADE);
CREATE TABLE `Clubs` (
`id` INT(11) NOT NULL,
`name` VARCHAR(50) NOT NULL,
`code` VARCHAR(5) NOT NULL,
`website_url` VARCHAR(64) NULL DEFAULT NULL,
PRIMARY KEY (`id`),
CONSTRAINT `clubs_contacts_fk`
FOREIGN KEY (`id`)
REFERENCES `Contacts` (`id`)
ON DELETE CASCADE
ON UPDATE CASCADE);
CREATE TABLE `Persons` (
`id` INT(11) NOT NULL,
`first_name` VARCHAR(50) NOT NULL,
`last_name` VARCHAR(50) NOT NULL,
PRIMARY KEY (`id`),
CONSTRAINT `persons_contacts_fk`
FOREIGN KEY (`id`)
REFERENCES `Contacts` (`id`)
ON DELETE CASCADE
ON UPDATE CASCADE);
INSERT INTO `Contacts` (`id`, `type`) VALUES
( 1, 'P'),
( 2, 'P'),
( 3, 'P'),
( 26, 'P'),
( 99, 'P'),
(101, 'C'),
(102, 'C'),
(103, 'C'),
(201, 'A'),
(202, 'A'),
(203, 'A');
INSERT INTO `Persons` (`id`, `first_name`, `last_name`) VALUES
( 1, 'Kay', 'Wundrak'),
( 2, 'Joe', 'Locke'),
( 3, 'Ahmed', 'Thiab'),
( 26, 'Seb', 'Gottwalk'),
( 99, 'Test', 'Test');
INSERT IGNORE INTO `Clubs` (`id`, `name`, `code`) VALUES
(101, 'TV Dieburg', 'DIEB'),
(102, 'SC Rist Wedel', 'RIST'),
(103, 'BBG Herford', 'HERF');
INSERT IGNORE INTO `Arenas` (`id`, `name`, `capacity`) VALUES
(201, 'Schlossgartenhalle', NULL),
(202, 'Steinberghalle', NULL),
(203, 'Halle am Gymnasium', NULL);
Caused by: java.lang.IllegalArgumentException: No enum constant net.bbstats.entity.ContactType.P
at java.lang.Enum.valueOf(Enum.java:238)
at org.hibernate.type.descriptor.java.EnumJavaTypeDescriptor.fromName(EnumJavaTypeDescriptor.java:84)
at org.hibernate.metamodel.model.convert.internal.NamedEnumValueConverter.toDomainValue(NamedEnumValueConverter.java:39)
at org.hibernate.metamodel.model.convert.internal.NamedEnumValueConverter.readValue(NamedEnumValueConverter.java:69)
at org.hibernate.type.EnumType.nullSafeGet(EnumType.java:250)
at org.hibernate.type.CustomType.nullSafeGet(CustomType.java:119)
at org.hibernate.type.AbstractType.hydrate(AbstractType.java:91)
at org.hibernate.persister.entity.AbstractEntityPersister.hydrate(AbstractEntityPersister.java:3007)
at org.hibernate.loader.Loader.loadFromResultSet(Loader.java:1746)
at org.hibernate.loader.Loader.instanceNotYetLoaded(Loader.java:1672)
at org.hibernate.loader.Loader.getRow(Loader.java:1561)
at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:731)
at org.hibernate.loader.Loader.processResultSet(Loader.java:990)
at org.hibernate.loader.Loader.doQuery(Loader.java:948)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:340)
at org.hibernate.loader.Loader.doList(Loader.java:2689)
at org.hibernate.loader.Loader.doList(Loader.java:2672)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2506)
at org.hibernate.loader.Loader.list(Loader.java:2501)
at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:504)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:395)
at org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:220)
at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1508)
at org.hibernate.query.internal.AbstractProducedQuery.doList(AbstractProducedQuery.java:1537)
at org.hibernate.query.internal.AbstractProducedQuery.list(AbstractProducedQuery.java:1505)
at org.hibernate.query.Query.getResultList(Query.java:135)
at net.bbstats.framework.service.Repository.findByNamedQuery(Repository.java:184)
at net.bbstats.framework.service.BaseEntityService.findByNamedQuery(BaseEntityService.java:382)
at net.bbstats.framework.service.BaseEntityService.findByNamedQuery(BaseEntityService.java:368)
at net.bbstats.framework.service.BaseEntityService.findByNamedQuery(BaseEntityService.java:344)
at net.bbstats.framework.service.BaseEntityService.findAllByQueryWithFetchGraph(BaseEntityService.java:300)
... 179 more