Hibernate 5和Spring Boot 2-多次注册AttributeConverter类

在我的Spring Boot应用程序中，我有一个简单的JPA

AttributeConverter

声明如下：

@Converter(autoApply = true)
public class GenderConverter implements AttributeConverter<Gender, String> {...}

如果我使用IntelliJ IDEA运行/调试配置来启动Spring Boot应用程序，则上下文初始化会失败，因为

AssertionFailure

异常。如果我使用

gradle clean bootRun

该应用程序将成功启动。所以它看起来像是IDE中的一个bug或者是项目设置中的一个错误

我调试并转储了转换器的两个后续注册的堆栈跟踪，但我仍然不明白为什么会发生两次。请分析这些痕迹

首次注册（无错误）：

第二次注册（错误！）：

---

这似乎是IntelliJ IDEA和Spring Boot的问题。以下步骤帮助我在Ubuntu中解决了这个问题，但在Windows10中没有

从build.gradle中删除

devtools

依赖项：

//运行时类路径组：'org.springframework.boot'，名称：'spring boot devtools'

构建>清理项目

关闭IntelliJ IDEA：

文件>退出

执行

gradle clean

从项目根文件夹中删除文件夹：build、out、.gradle:

rm-rf构建。渐变

清除系统缓存：

启动IntelliJ IDEA并进入菜单文件>使缓存无效/重新启动

IntelliJ正在更新索引，请稍候

---

现在再次尝试运行调试配置。重建项目需要一段时间，但之后它应该会成功启动。

IntelliJ IDEA和Spring Boot似乎存在问题。以下步骤帮助我在Windows 10中解决了此问题

打开设置CTRL+ALT+S

转到构建、执行、部署|构建工具| Gradle |

取消选中“将IDE生成/运行操作委派给Gradle”

现在再次尝试运行调试配置

@Entity
public class User {
    @Column(length = 1, nullable = false)
    private Gender gender;
    // ...
}

  at org.hibernate.boot.internal.AttributeConverterManager.addConverter(AttributeConverterManager.java:44)
  at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.addAttributeConverter(InFlightMetadataCollectorImpl.java:353)
  at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:118)
  at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.metadata(EntityManagerFactoryBuilderImpl.java:861)
  at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:888)
  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:390)
  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:1758)
  at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1695)
  at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:573)
  at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:495)
  at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:317)
  at org.springframework.beans.factory.support.AbstractBeanFactory$$Lambda$122.379121284.getObject(Unknown Source:-1)
  at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
....

Caused by: org.hibernate.AssertionFailure: AttributeConverter class [class by.naxa.example.conversion.GenderConverter] registered multiple times
    at org.hibernate.boot.internal.AttributeConverterManager.addConverter(AttributeConverterManager.java:46) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]
    at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.addAttributeConverter(InFlightMetadataCollectorImpl.java:353) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]
    at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.addAttributeConverter(InFlightMetadataCollectorImpl.java:363) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]
    at org.hibernate.boot.model.source.internal.annotations.AnnotationMetadataSourceProcessorImpl$AttributeConverterManager.addAttributeConverter(AnnotationMetadataSourceProcessorImpl.java:325) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]
    at org.hibernate.boot.model.source.internal.annotations.AnnotationMetadataSourceProcessorImpl.categorizeAnnotatedClass(AnnotationMetadataSourceProcessorImpl.java:118) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]
    at org.hibernate.boot.model.source.internal.annotations.AnnotationMetadataSourceProcessorImpl.<init>(AnnotationMetadataSourceProcessorImpl.java:105) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]
    at org.hibernate.boot.model.process.spi.MetadataBuildingProcess$1.<init>(MetadataBuildingProcess.java:147) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]
    at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:141) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]
    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.metadata(EntityManagerFactoryBuilderImpl.java:861) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]
    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:888) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]
    at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:57) ~[spring-orm-5.0.9.RELEASE.jar:5.0.9.RELEASE]
    at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:365) ~[spring-orm-5.0.9.RELEASE.jar:5.0.9.RELEASE]
    at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory(AbstractEntityManagerFactoryBean.java:390) ~[spring-orm-5.0.9.RELEASE.jar:5.0.9.RELEASE]
    at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:377) ~[spring-orm-5.0.9.RELEASE.jar:5.0.9.RELEASE]
    at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.afterPropertiesSet(LocalContainerEntityManagerFactoryBean.java:341) ~[spring-orm-5.0.9.RELEASE.jar:5.0.9.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1758) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1695) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
    ....

@SpringBootApplication
public class MysqlApplication {
    public static void main(String[] args) {
        SpringApplication.run(MysqlApplication.class, args);
    }
}