在Spring Boot应用程序中，我有一个简单的JPA AttributeConverter声明为：
@Converter(autoApply = true)
public class GenderConverter implements AttributeConverter<Gender, String> {...}
并应用为：
@Entity
public class User {
@Column(length = 1, nullable = false)
private Gender gender;
// ...
}
如果我使用IntelliJ IDEA运行/调试配置来启动Spring Boot应用程序，则由于AssertionFailure异常而导致上下文初始化失败。如果我使用gradle clean bootRun，则应用程序成功启动。因此，这似乎是IDE中的错误或项目设置中的错误。
我调试并转储了Converter的两个后续注册的堆栈跟踪，但是我仍然不明白为什么它会发生两次。请分析堆栈跟踪。
首次注册（无错误）：
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$122.379121284.getObject(Unknown Source:-1)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
....
第二次注册（错误！）：
Caused by: org.hibernate.AssertionFailure: AttributeConverter class [class by.naxa.example.conversion.GenderConverter] registered multiple times
at org.hibernate.boot.internal.AttributeConverterManager.addConverter(AttributeConverterManager.java:46) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]
at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.addAttributeConverter(InFlightMetadataCollectorImpl.java:353) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]
at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.addAttributeConverter(InFlightMetadataCollectorImpl.java:363) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]
at org.hibernate.boot.model.source.internal.annotations.AnnotationMetadataSourceProcessorImpl$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]
....
如果您认为有帮助，我可以提供gradle :dependencyInsight --dependency jpa输出或“项目结构”>“模块”的屏幕截图。
我知道这里有a similar question，但是公认的解决方案对我没有帮助。我不使用@EnableAutoconfiguration注释。我的主课很简单：
@SpringBootApplication
public class MysqlApplication {
public static void main(String[] args) {
SpringApplication.run(MysqlApplication.class, args);
}
}
答案 0 :(得分：1)
似乎是IntelliJ IDEA和Spring Boot Dev Tools的问题。以下步骤可帮助我在Ubuntu中解决此问题，但在Windows 10中无法解决此问题。
devtools依赖项： // runtimeClasspath group: 'org.springframework.boot', name: '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 build out .gradle
清理系统缓存：
启动IntelliJ IDEA并进入菜单>文件>使缓存无效/重新启动
在IntelliJ更新索引时等待
现在尝试再次运行“调试”配置。重建项目需要一些时间，但随后应该可以成功启动。
答案 1 :(得分：0)