关键解决点
val code = FieldUtils.readDeclaredField(obj, "code", true)
报错的代码
package com.ak47.cms.cms.entity
import org.hibernate.annotations.GenericGenerator
import java.util.*
import javax.persistence.*
@Entity
@Table(indexes = arrayOf(Index(name = "idx_category", columnList = "category")))
class Tree {
@Id
@GeneratedValue(strategy = GenerationType.AUTO, generator = "custom-uuid")
@GenericGenerator(name = "custom-uuid", strategy = "com.ak47.cms.cms.tree.CustomUUIDGenerator")
var id: Long = 0
var parentId: Long = 0
@Column(length = 200)
var name = ""
@Column(length = 100)
var category = ""
var gmtCreated = Date()
var gmtModified = Date()
var isDeleted = 0
@Version
var version = 0
}
报错日志
Caused by: javax.persistence.PersistenceException: [PersistenceUnit: default] Unable to build Hibernate SessionFactory
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.persistenceException(EntityManagerFactoryBuilderImpl.java:970)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:895)
at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:57)
at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:365)
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory(AbstractEntityManagerFactoryBean.java:388)
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:377)
at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.afterPropertiesSet(LocalContainerEntityManagerFactoryBean.java:341)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1769)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1706)
... 16 common frames omitted
Caused by: org.hibernate.MappingException: Could not instantiate id generator [entity-name=com.ak47.cms.cms.entity.Tree]
at org.hibernate.id.factory.internal.DefaultIdentifierGeneratorFactory.createIdentifierGenerator(DefaultIdentifierGeneratorFactory.java:124)
at org.hibernate.mapping.SimpleValue.createIdentifierGenerator(SimpleValue.java:311)
at org.hibernate.internal.SessionFactoryImpl.lambda$new$1(SessionFactoryImpl.java:287)
at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)
at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175)
at java.util.HashMap$ValueSpliterator.forEachRemaining(HashMap.java:1620)
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418)
at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:286)
at org.hibernate.boot.internal.SessionFactoryBuilderImpl.build(SessionFactoryBuilderImpl.java:460)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:892)
... 23 common frames omitted
Caused by: org.hibernate.HibernateException: Unanticipated return type [java.lang.Long] for UUID conversion
at org.hibernate.id.UUIDGenerator.configure(UUIDGenerator.java:96)
at org.hibernate.id.factory.internal.DefaultIdentifierGeneratorFactory.createIdentifierGenerator(DefaultIdentifierGeneratorFactory.java:118)
... 37 common frames omitted
解决方案
package com.ak47.cms.cms.entity
import org.hibernate.annotations.GenericGenerator
import java.util.*
import javax.persistence.*
@Entity
@Table(indexes = arrayOf(Index(name = "idx_category", columnList = "category")))
class Tree {
@Id
@Column(length = 100)
@GeneratedValue(strategy = GenerationType.AUTO, generator = "custom-uuid")
@GenericGenerator(name = "custom-uuid", strategy = "com.ak47.cms.cms.tree.CustomUUIDGenerator")
var code: String = "0"
@Column(length = 100)
var parentCode: String = "0"
@Column(length = 200)
var name = ""
@Column(length = 100)
var category = ""
var gmtCreated = Date()
var gmtModified = Date()
var isDeleted = 0
@Version
var version = 0
}
package com.ak47.cms.cms.tree
import org.apache.commons.lang3.reflect.FieldUtils
import org.hibernate.engine.spi.SharedSessionContractImplementor
import org.hibernate.id.UUIDGenerator
import java.io.Serializable
class CustomUUIDGenerator : UUIDGenerator() {
override fun generate(session: SharedSessionContractImplementor, obj: Any): Serializable {
val code = FieldUtils.readDeclaredField(obj, "code", true)
if (code != null) {
return code as Serializable
}
return super.generate(session, obj)
}
}
回答1:
The root exception says it all:
Caused by: org.hibernate.HibernateException: Unanticipated return type [java.lang.Long] for UUID
You are using a UUID id generator on a type which it does not support. You should use String instead of Long in this case.
回答2:
if you use this deprecated org.hibernate.ejb.HibernatePersistence set new provider like below
<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
if your value is
<property name="hibernate.hbm2ddl.auto" value="update" />
set "create-drop"
<property name="hibernate.hbm2ddl.auto" value="create-drop" />
XML path: resources/META-INF/persistence.xml
For mysql
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.1" xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">
<persistence-unit name="persistenceUnit" transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
<properties>
<property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/>
<property name="hibernate.hbm2ddl.auto" value="create-drop" />
<property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver"/>
<property name="hibernate.show_sql" value="true"/>
<property name="hibernate.connection.username" value="yourname"/>
<property name="hibernate.connection.password" value="yourpassword"/>
<property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/yourschema"/>
<property name="hibernate.max_fetch_depth" value="3"/>
</properties>
</persistence-unit>
</persistence>
回答3:
Firstly you should share your the complete stacktrace about the exception and the persistence.xml content. Then in my opinion based on what I see the problem could be that you don't have declared a persistence provider in your persistence.xml. In fact if you are developing in a non container managed envirorment you need to declare a persistence provider.
<persistence xmlns="http://java.sun.com/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"
version="2.0">
<persistence-unit name="myunit" >
<provider>org.hibernate.ejb.HibernatePersistence</provider>
//Others properties
</persistence-unit>
回答4:
I do not know if the problem still exists, but I thought you have to put the persistence.xml file into src/main/META-INF folder. I see you put it into src/META-INF. Maybe that is the Problem? and of course the entities you want to link belong in src/main folder, too :)
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