JDBC(Java DataBase Connectivity)是基本API,它通过使用Java编程语言执行SQL语句来实现与SQL数据库服务器的交互。
所以我正在启动一个Web应用程序,我想使用JSP页面(我以前使用过它们)来动态访问数据库并从不同的表中检索数据。 我现在已经有了一个基本的数据库...
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每当我尝试通过jdbc连接mySql时,我都在使用IntelliJ Idea,代码中没有错误,但仍然无法连接。 pom.xml 每当我尝试通过jdbc连接mySql时,我都使用IntelliJ Idea,代码中没有错误,但仍然无法连接。 pom.xml <?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>3.2.0</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.restApi</groupId> <artifactId>RestAPI</artifactId> <version>0.0.1-SNAPSHOT</version> <name>RestAPIDemo</name> <description>Demo project for RestAPI</description> <properties> <java.version>17</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-jpa</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>com.mysql</groupId> <artifactId>mysql-connector-j</artifactId> <version>8.2.0</version> <scope>runtime</scope> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project> 这是我的 applications.yaml 根据此,应该在 mySql 中创建 cloud_vendor 架构,但它显示错误 spring: datasource: url: jdbc:mysql://localhost:3306/cloud_vendor?useSSL=false username: root password: root #jpa settings jpa.hibernate.ddl_auto: create 每当我运行时,我都会收到以下错误消息 2023-12-11T21:01:13.209+05:30 WARN 17680 --- [ main] o.h.e.j.e.i.JdbcEnvironmentInitiator : HHH000342: Could not obtain connection to query metadata java.lang.NullPointerException: Cannot invoke "org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(java.sql.SQLException, String)" because the return value of "org.hibernate.resource.transaction.backend.jdbc.internal.JdbcIsolationDelegate.sqlExceptionHelper()" is null at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcIsolationDelegate.delegateWork(JdbcIsolationDelegate.java:116) ~[hibernate-core-6.3.1.Final.jar:6.3.1.Final] at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.getJdbcEnvironmentUsingJdbcMetadata(JdbcEnvironmentInitiator.java:273) ~[hibernate-core-6.3.1.Final.jar:6.3.1.Final] at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:105) ~[hibernate-core-6.3.1.Final.jar:6.3.1.Final] at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:66) ~[hibernate-core-6.3.1.Final.jar:6.3.1.Final] at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.initiateService(StandardServiceRegistryImpl.java:129) ~[hibernate-core-6.3.1.Final.jar:6.3.1.Final] at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:263) ~[hibernate-core-6.3.1.Final.jar:6.3.1.Final] at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:238) ~[hibernate-core-6.3.1.Final.jar:6.3.1.Final] at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:215) ~[hibernate-core-6.3.1.Final.jar:6.3.1.Final] at org.hibernate.boot.model.relational.Database.<init>(Database.java:45) ~[hibernate-core-6.3.1.Final.jar:6.3.1.Final] at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.getDatabase(InFlightMetadataCollectorImpl.java:223) ~[hibernate-core-6.3.1.Final.jar:6.3.1.Final] at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.<init>(InFlightMetadataCollectorImpl.java:191) ~[hibernate-core-6.3.1.Final.jar:6.3.1.Final] at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:169) ~[hibernate-core-6.3.1.Final.jar:6.3.1.Final] at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.metadata(EntityManagerFactoryBuilderImpl.java:1432) ~[hibernate-core-6.3.1.Final.jar:6.3.1.Final] at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:1503) ~[hibernate-core-6.3.1.Final.jar:6.3.1.Final] at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:75) ~[spring-orm-6.1.1.jar:6.1.1] at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:376) ~[spring-orm-6.1.1.jar:6.1.1] at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory(AbstractEntityManagerFactoryBean.java:409) ~[spring-orm-6.1.1.jar:6.1.1] at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:396) ~[spring-orm-6.1.1.jar:6.1.1] at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.afterPropertiesSet(LocalContainerEntityManagerFactoryBean.java:352) ~[spring-orm-6.1.1.jar:6.1.1] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1822) ~[spring-beans-6.1.1.jar:6.1.1] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1771) ~[spring-beans-6.1.1.jar:6.1.1] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:601) ~[spring-beans-6.1.1.jar:6.1.1] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:523) ~[spring-beans-6.1.1.jar:6.1.1] at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:325) ~[spring-beans-6.1.1.jar:6.1.1] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-6.1.1.jar:6.1.1] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:323) ~[spring-beans-6.1.1.jar:6.1.1] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-6.1.1.jar:6.1.1] at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1173) ~[spring-context-6.1.1.jar:6.1.1] at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:936) ~[spring-context-6.1.1.jar:6.1.1] at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:616) ~[spring-context-6.1.1.jar:6.1.1] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:146) ~[spring-boot-3.2.0.jar:3.2.0] at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:753) ~[spring-boot-3.2.0.jar:3.2.0] at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:455) ~[spring-boot-3.2.0.jar:3.2.0] at org.springframework.boot.SpringApplication.run(SpringApplication.java:323) ~[spring-boot-3.2.0.jar:3.2.0] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1342) ~[spring-boot-3.2.0.jar:3.2.0] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1331) ~[spring-boot-3.2.0.jar:3.2.0] at com.restApi.RestAPI.RestApiDemoApplication.main(RestApiDemoApplication.java:12) ~[classes/:na] 2023-12-11T21:01:13.211+05:30 ERROR 17680 --- [ main] j.LocalContainerEntityManagerFactoryBean : Failed to initialize JPA EntityManagerFactory: Unable to create requested service [org.hibernate.engine.jdbc.env.spi.JdbcEnvironment] due to: Unable to determine Dialect without JDBC metadata (please set 'javax.persistence.jdbc.url', 'hibernate.connection.url', or 'hibernate.dialect') 2023-12-11T21:01:13.212+05:30 WARN 17680 --- [ main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaConfiguration.class]: Unable to create requested service [org.hibernate.engine.jdbc.env.spi.JdbcEnvironment] due to: Unable to determine Dialect without JDBC metadata (please set 'javax.persistence.jdbc.url', 'hibernate.connection.url', or 'hibernate.dialect') 2023-12-11T21:01:13.218+05:30 INFO 17680 --- [ main] o.apache.catalina.core.StandardService : Stopping service [Tomcat] 2023-12-11T21:01:13.239+05:30 INFO 17680 --- [ main] .s.b.a.l.ConditionEvaluationReportLogger : Error starting ApplicationContext. To display the condition evaluation report re-run your application with 'debug' enabled. 2023-12-11T21:01:13.274+05:30 ERROR 17680 --- [ main] o.s.boot.SpringApplication : Application run failed org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaConfiguration.class]: Unable to create requested service [org.hibernate.engine.jdbc.env.spi.JdbcEnvironment] due to: Unable to determine Dialect without JDBC metadata (please set 'javax.persistence.jdbc.url', 'hibernate.connection.url', or 'hibernate.dialect') at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1775) ~[spring-beans-6.1.1.jar:6.1.1] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:601) ~[spring-beans-6.1.1.jar:6.1.1] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:523) ~[spring-beans-6.1.1.jar:6.1.1] at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:325) ~[spring-beans-6.1.1.jar:6.1.1] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-6.1.1.jar:6.1.1] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:323) ~[spring-beans-6.1.1.jar:6.1.1] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-6.1.1.jar:6.1.1] at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1173) ~[spring-context-6.1.1.jar:6.1.1] at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:936) ~[spring-context-6.1.1.jar:6.1.1] at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:616) ~[spring-context-6.1.1.jar:6.1.1] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:146) ~[spring-boot-3.2.0.jar:3.2.0] at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:753) ~[spring-boot-3.2.0.jar:3.2.0] at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:455) ~[spring-boot-3.2.0.jar:3.2.0] at org.springframework.boot.SpringApplication.run(SpringApplication.java:323) ~[spring-boot-3.2.0.jar:3.2.0] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1342) ~[spring-boot-3.2.0.jar:3.2.0] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1331) ~[spring-boot-3.2.0.jar:3.2.0] at com.restApi.RestAPI.RestApiDemoApplication.main(RestApiDemoApplication.java:12) ~[classes/:na] Caused by: org.hibernate.service.spi.ServiceException: Unable to create requested service [org.hibernate.engine.jdbc.env.spi.JdbcEnvironment] due to: Unable to determine Dialect without JDBC metadata (please set 'javax.persistence.jdbc.url', 'hibernate.connection.url', or 'hibernate.dialect') at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:276) ~[hibernate-core-6.3.1.Final.jar:6.3.1.Final] at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:238) ~[hibernate-core-6.3.1.Final.jar:6.3.1.Final] at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:215) ~[hibernate-core-6.3.1.Final.jar:6.3.1.Final] at org.hibernate.boot.model.relational.Database.<init>(Database.java:45) ~[hibernate-core-6.3.1.Final.jar:6.3.1.Final] at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.getDatabase(InFlightMetadataCollectorImpl.java:223) ~[hibernate-core-6.3.1.Final.jar:6.3.1.Final] at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.<init>(InFlightMetadataCollectorImpl.java:191) ~[hibernate-core-6.3.1.Final.jar:6.3.1.Final] at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:169) ~[hibernate-core-6.3.1.Final.jar:6.3.1.Final] at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.metadata(EntityManagerFactoryBuilderImpl.java:1432) ~[hibernate-core-6.3.1.Final.jar:6.3.1.Final] at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:1503) ~[hibernate-core-6.3.1.Final.jar:6.3.1.Final] at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:75) ~[spring-orm-6.1.1.jar:6.1.1] at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:376) ~[spring-orm-6.1.1.jar:6.1.1] at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory(AbstractEntityManagerFactoryBean.java:409) ~[spring-orm-6.1.1.jar:6.1.1] at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:396) ~[spring-orm-6.1.1.jar:6.1.1] at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.afterPropertiesSet(LocalContainerEntityManagerFactoryBean.java:352) ~[spring-orm-6.1.1.jar:6.1.1] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1822) ~[spring-beans-6.1.1.jar:6.1.1] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1771) ~[spring-beans-6.1.1.jar:6.1.1] ... 16 common frames omitted Caused by: org.hibernate.HibernateException: Unable to determine Dialect without JDBC metadata (please set 'javax.persistence.jdbc.url', 'hibernate.connection.url', or 'hibernate.dialect') at org.hibernate.engine.jdbc.dialect.internal.DialectFactoryImpl.determineDialect(DialectFactoryImpl.java:190) ~[hibernate-core-6.3.1.Final.jar:6.3.1.Final] at org.hibernate.engine.jdbc.dialect.internal.DialectFactoryImpl.buildDialect(DialectFactoryImpl.java:86) ~[hibernate-core-6.3.1.Final.jar:6.3.1.Final] at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.getJdbcEnvironmentWithDefaults(JdbcEnvironmentInitiator.java:141) ~[hibernate-core-6.3.1.Final.jar:6.3.1.Final] at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.getJdbcEnvironmentUsingJdbcMetadata(JdbcEnvironmentInitiator.java:344) ~[hibernate-core-6.3.1.Final.jar:6.3.1.Final] at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:105) ~[hibernate-core-6.3.1.Final.jar:6.3.1.Final] at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:66) ~[hibernate-core-6.3.1.Final.jar:6.3.1.Final] at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.initiateService(StandardServiceRegistryImpl.java:129) ~[hibernate-core-6.3.1.Final.jar:6.3.1.Final] at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:263) ~[hibernate-core-6.3.1.Final.jar:6.3.1.Final] ... 31 common frames omitted Process finished with exit code 1 这个问题解决了吗?你能告诉我是如何解决的吗?
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