我需要获取的META信息动态存在于我的架构中的所有表，元信息包括表，实体，列名等。
我遵循了以下教程
https://vladmihalcea.com/how-to-get-the-entity-mapping-to-database-table-binding-metadata-from-hibernate/
如以上链接中所述，我创建了一个名为MetadataExtractorIntegrator.java的集成器。
package com.test.ttv;
import org.hibernate.boot.Metadata;
import org.hibernate.boot.model.relational.Database;
import org.hibernate.engine.spi.SessionFactoryImplementor;
import org.hibernate.service.spi.SessionFactoryServiceRegistry;
public class MetadataExtractorIntegrator implements org.hibernate.integrator.spi.Integrator {
public static final MetadataExtractorIntegrator INSTANCE = new MetadataExtractorIntegrator();
private Database database;
private Metadata metadata;
public Database getDatabase() {
return database;
}
public Metadata getMetadata() {
return metadata;
}
@Override
public void integrate(
Metadata metadata,
SessionFactoryImplementor sessionFactory,
SessionFactoryServiceRegistry serviceRegistry) {
this.database = metadata.getDatabase();
this.metadata = metadata;
}
@Override
public void disintegrate(
SessionFactoryImplementor sessionFactory,
SessionFactoryServiceRegistry serviceRegistry) {
}
}
并尝试通过以下配置在我的应用程序中注册
application.yml
jpa:
properties:
hibernate.integrator_provider: com.test.ttv.MetadataExtractorIntegrator
而且在开始构建时出现以下异常
Caused by: java.lang.ClassCastException: java.lang.String cannot be cast to org.hibernate.jpa.boot.spi.IntegratorProvider
更多StackTrace
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaConfiguration.class]: Invocation of init method failed; nested exception is java.lang.ClassCastException: java.lang.String cannot be cast to org.hibernate.jpa.boot.spi.IntegratorProvider
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1710) ~[spring-beans-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:583) ~[spring-beans-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:502) ~[spring-beans-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:312) ~[spring-beans-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228) ~[spring-beans-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:310) ~[spring-beans-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:200) ~[spring-beans-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1085) ~[spring-context-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:858) ~[spring-context-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549) ~[spring-context-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:140) ~[spring-boot-2.0.0.RELEASE.jar:2.0.0.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:752) [spring-boot-2.0.0.RELEASE.jar:2.0.0.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:388) [spring-boot-2.0.0.RELEASE.jar:2.0.0.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:327) [spring-boot-2.0.0.RELEASE.jar:2.0.0.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1246) [spring-boot-2.0.0.RELEASE.jar:2.0.0.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1234) [spring-boot-2.0.0.RELEASE.jar:2.0.0.RELEASE]
at testtest(Test.java:31) [main/:na]
Caused by: java.lang.ClassCastException: java.lang.String cannot be cast to org.hibernate.jpa.boot.spi.IntegratorProvider
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.buildBootstrapServiceRegistry(EntityManagerFactoryBuilderImpl.java:339) ~[hibernate-core-5.2.14.Final.jar:5.2.14.Final]
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.<init>(EntityManagerFactoryBuilderImpl.java:196) ~[hibernate-core-5.2.14.Final.jar:5.2.14.Final]
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.<init>(EntityManagerFactoryBuilderImpl.java:164) ~[hibernate-core-5.2.14.Final.jar:5.2.14.Final]
at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:51) ~[spring-orm-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:365) ~[spring-orm-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory(AbstractEntityManagerFactoryBean.java:388) ~[spring-orm-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:377) ~[spring-orm-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.afterPropertiesSet(LocalContainerEntityManagerFactoryBean.java:341) ~[spring-orm-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1769) ~[spring-beans-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1706) ~[spring-beans-5.0.4.RELEASE.jar:5.0.4.RELEASE]
... 16 common frames omitted
谁能帮我解决这个问题？谢谢
参考方案
在Spring Boot中，spring.jpa.properties指向 Map<String, String> ，因此它只能包含String值。
但是在Hibernate中，当EntityManagerFactoryBuilderImpl读取hibernate.integrator_provider时，它期望找到IntegratorProvider的实例而不是Class名称，因此是例外。
但是，您可以添加一个实现HibernatePropertiesCustomizer的bean，以将IntegrationProvider实例添加到Hibernate属性中:
@Component
public class HibernateConfig implements HibernatePropertiesCustomizer {
@Override
public void customize(Map<String, Object> hibernateProperties) {
hibernateProperties.put("hibernate.integrator_provider",
(IntegratorProvider) () -> Collections.singletonList(MetadataExtractorIntegrator.INSTANCE));
}
}
我在this repository中创建了一个工作示例。
Spring Boot:java.time.Duration的默认序列化从字符串更改为数字 - java我们最近从Spring Boot 2.1.9升级到2.2.1，这导致我们的测试失败。调查导致结果，默认情况下java.time.Duration类型现在序列化为不同的序列。现在，我们将得到"PT15M"，而不是在JSON消息中包含字符串"900.0"。 POJO定义如下所示@JsonProperty(required …
从Spring Boot Application检查Keycloak中的密码是否有效 - java我的用户已经使用有效的令牌登录，但是在一些重要的操作（如确认或取消付费订阅）中，我希望它与其他数据一起发送密码，以便服务器对其进行验证。到目前为止，我的应用程序已将用户存储在数据库中，并且以这种方式进行开发很容易。如何检查用户正确发送的密码？我需要尝试在后端使用用户名和密码登录吗？ 参考方案 您的后端应该已经设置为Keycloak客户端，以便它可以传递令牌进…
Spring Boot-使用上下文路径时在根级别的静态内容 - java假设我有一个application.yml内容server: port: 8000 context-path: /rest 因此，将像这样访问所有控制器和htmlhttp://server:8000/rest/controller因此，具有此配置...有可能在不更改其上下文路径的情况下将一些静态html元素添加到其根级别？ （我已经将index.html添加…
如何在Spring-Rest中将路径变量映射到实体 - java我在Spring-RS中获得了一些REST端点，该端点使用实体ID作为路径变量。大多数情况下，方法要做的第一件事是使用id检索实体。有没有一种方法可以自动将id映射到实体，仅将实体作为方法参数？现在的情况 ：@RequestMapping(path="/{entityId}) public void method(@PathVariable Str…
JAVA JPA错误401:“需要完全身份验证才能访问此资源” - java我正在使用从C＃应用程序调用的JAVA JPA API。 C＃-> JAVA API调用方法由OpenAPI-generator生成。我使用Oauth2进行身份验证。调用我获得访问令牌后，C＃-> Oauth2似乎工作正常，但是在发送GET请求（或任何其他需要身份验证的请求）时，出现错误“需要完全身份验证才能访问此资源”。邮递员-> Oau…