Maven Spring Boot 尝试连接到 MySQL
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【中文标题】Maven Spring Boot 尝试连接到 MySQL【英文标题】：Maven Spring Boot trying to connect to MySQL 【发布时间】：2021-04-04 10:16:45 【问题描述】：我正在尝试将我的 Web 应用程序连接到 mysql。 Spring Boot 没有检测到数据库，但可以连接到服务器。有人可以引导我朝着正确的方向前进，以便它可以检测到架构。使用@Entity 注释，它应该在数据库中自动创建一个表作为“用户”。它还应该在控制台中显示“数据库可用”，我尝试在网上查找但无济于事。任何帮助将不胜感激！
这是我的 application.properties
spring.datasource.url=jdbc:mysql://localhost:3306/espersdb
spring.datasource.username=root
spring.datasource.password=password
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL5InnoDBDialect
spring.jpa.hibernate.ddl-auto=none
这是我的控制台
2020-12-27 03:32:47.859 INFO 26012 --- [ restartedMain] c.D.E.E.EspersWebsiteApplication : Starting EspersWebsiteApplication using Java 14.0.2 on DESKTOP-01JT4QR with PID 26012 (C:\Users\Donobuz\Documents\Espers_Website\target\classes started by Donobuz in C:\Users\Donobuz\Documents\Espers_Website)
2020-12-27 03:32:47.862 INFO 26012 --- [ restartedMain] c.D.E.E.EspersWebsiteApplication : No active profile set, falling back to default profiles: default
2020-12-27 03:32:47.913 INFO 26012 --- [ restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : Devtools property defaults active! Set 'spring.devtools.add-properties' to 'false' to disable
2020-12-27 03:32:47.913 INFO 26012 --- [ restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : For additional web related logging consider setting the 'logging.level.web' property to 'DEBUG'
2020-12-27 03:32:48.510 INFO 26012 --- [ restartedMain] .s.d.r.c.RepositoryConfigurationDelegate : Multiple Spring Data modules found, entering strict repository configuration mode!
2020-12-27 03:32:48.511 INFO 26012 --- [ restartedMain] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data JDBC repositories in DEFAULT mode.
2020-12-27 03:32:48.516 INFO 26012 --- [ restartedMain] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 3 ms. Found 0 JDBC repository interfaces.
2020-12-27 03:32:48.523 INFO 26012 --- [ restartedMain] .s.d.r.c.RepositoryConfigurationDelegate : Multiple Spring Data modules found, entering strict repository configuration mode!
2020-12-27 03:32:48.523 INFO 26012 --- [ restartedMain] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data JPA repositories in DEFAULT mode.
2020-12-27 03:32:48.529 INFO 26012 --- [ restartedMain] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 0 ms. Found 0 JPA repository interfaces.
2020-12-27 03:32:48.830 INFO 26012 --- [ restartedMain] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.hateoas.config.HateoasConfiguration' of type [org.springframework.hateoas.config.HateoasConfiguration] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2020-12-27 03:32:48.833 INFO 26012 --- [ restartedMain] trationDelegate$BeanPostProcessorChecker : Bean 'relProviderPluginRegistry' of type [org.springframework.plugin.core.support.PluginRegistryFactoryBean] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2020-12-27 03:32:48.839 INFO 26012 --- [ restartedMain] trationDelegate$BeanPostProcessorChecker : Bean 'relProviderPluginRegistry' of type [org.springframework.plugin.core.OrderAwarePluginRegistry] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2020-12-27 03:32:48.842 INFO 26012 --- [ restartedMain] trationDelegate$BeanPostProcessorChecker : Bean '_relProvider' of type [org.springframework.hateoas.server.core.DelegatingLinkRelationProvider] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2020-12-27 03:32:48.847 INFO 26012 --- [ restartedMain] trationDelegate$BeanPostProcessorChecker : Bean 'messageResolver' of type [org.springframework.hateoas.mediatype.MessageSourceResolver] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2020-12-27 03:32:48.848 INFO 26012 --- [ restartedMain] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.data.web.config.SpringDataJacksonConfiguration' of type [org.springframework.data.web.config.SpringDataJacksonConfiguration] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2020-12-27 03:32:48.851 INFO 26012 --- [ restartedMain] trationDelegate$BeanPostProcessorChecker : Bean 'jacksonGeoModule' of type [org.springframework.data.geo.GeoModule] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2020-12-27 03:32:48.861 INFO 26012 --- [ restartedMain] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.boot.autoconfigure.data.rest.RepositoryRestMvcAutoConfiguration' of type [org.springframework.boot.autoconfigure.data.rest.RepositoryRestMvcAutoConfiguration] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2020-12-27 03:32:48.863 INFO 26012 --- [ restartedMain] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration$JacksonObjectMapperBuilderConfiguration' of type [org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration$JacksonObjectMapperBuilderConfiguration] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2020-12-27 03:32:48.864 INFO 26012 --- [ restartedMain] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration$Jackson2ObjectMapperBuilderCustomizerConfiguration' of type [org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration$Jackson2ObjectMapperBuilderCustomizerConfiguration] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2020-12-27 03:32:48.872 INFO 26012 --- [ restartedMain] trationDelegate$BeanPostProcessorChecker : Bean 'spring.jackson-org.springframework.boot.autoconfigure.jackson.JacksonProperties' of type [org.springframework.boot.autoconfigure.jackson.JacksonProperties] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2020-12-27 03:32:48.873 INFO 26012 --- [ restartedMain] trationDelegate$BeanPostProcessorChecker : Bean 'standardJacksonObjectMapperBuilderCustomizer' of type [org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration$Jackson2ObjectMapperBuilderCustomizerConfiguration$StandardJackson2ObjectMapperBuilderCustomizer] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2020-12-27 03:32:48.875 INFO 26012 --- [ restartedMain] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration$ParameterNamesModuleConfiguration' of type [org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration$ParameterNamesModuleConfiguration] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2020-12-27 03:32:48.876 INFO 26012 --- [ restartedMain] trationDelegate$BeanPostProcessorChecker : Bean 'parameterNamesModule' of type [com.fasterxml.jackson.module.paramnames.ParameterNamesModule] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2020-12-27 03:32:48.877 INFO 26012 --- [ restartedMain] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration' of type [org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2020-12-27 03:32:48.881 INFO 26012 --- [ restartedMain] trationDelegate$BeanPostProcessorChecker : Bean 'jsonComponentModule' of type [org.springframework.boot.jackson.JsonComponentModule] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2020-12-27 03:32:48.883 INFO 26012 --- [ restartedMain] trationDelegate$BeanPostProcessorChecker : Bean 'jacksonObjectMapperBuilder' of type [org.springframework.http.converter.json.Jackson2ObjectMapperBuilder] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2020-12-27 03:32:48.888 INFO 26012 --- [ restartedMain] trationDelegate$BeanPostProcessorChecker : Bean 'spring.data.rest-org.springframework.boot.autoconfigure.data.rest.RepositoryRestProperties' of type [org.springframework.boot.autoconfigure.data.rest.RepositoryRestProperties] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2020-12-27 03:32:48.889 INFO 26012 --- [ restartedMain] trationDelegate$BeanPostProcessorChecker : Bean 'springBootRepositoryRestConfigurer' of type [org.springframework.boot.autoconfigure.data.rest.SpringBootRepositoryRestConfigurer] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2020-12-27 03:32:48.890 INFO 26012 --- [ restartedMain] trationDelegate$BeanPostProcessorChecker : Bean 'configurerDelegate' of type [org.springframework.data.rest.webmvc.config.RepositoryRestConfigurerDelegate] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2020-12-27 03:32:48.896 INFO 26012 --- [ restartedMain] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.boot.autoconfigure.http.HttpMessageConvertersAutoConfiguration$StringHttpMessageConverterConfiguration' of type [org.springframework.boot.autoconfigure.http.HttpMessageConvertersAutoConfiguration$StringHttpMessageConverterConfiguration] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2020-12-27 03:32:48.902 INFO 26012 --- [ restartedMain] trationDelegate$BeanPostProcessorChecker : Bean 'stringHttpMessageConverter' of type [org.springframework.http.converter.StringHttpMessageConverter] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2020-12-27 03:32:48.903 INFO 26012 --- [ restartedMain] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.boot.autoconfigure.http.JacksonHttpMessageConvertersConfiguration$MappingJackson2HttpMessageConverterConfiguration' of type [org.springframework.boot.autoconfigure.http.JacksonHttpMessageConvertersConfiguration$MappingJackson2HttpMessageConverterConfiguration] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2020-12-27 03:32:48.903 INFO 26012 --- [ restartedMain] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration$JacksonObjectMapperConfiguration' of type [org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration$JacksonObjectMapperConfiguration] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2020-12-27 03:32:48.907 INFO 26012 --- [ restartedMain] trationDelegate$BeanPostProcessorChecker : Bean 'jacksonObjectMapperBuilder' of type [org.springframework.http.converter.json.Jackson2ObjectMapperBuilder] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2020-12-27 03:32:48.929 INFO 26012 --- [ restartedMain] trationDelegate$BeanPostProcessorChecker : Bean 'jacksonObjectMapper' of type [com.fasterxml.jackson.databind.ObjectMapper] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2020-12-27 03:32:48.934 INFO 26012 --- [ restartedMain] trationDelegate$BeanPostProcessorChecker : Bean 'mappingJackson2HttpMessageConverter' of type [org.springframework.http.converter.json.MappingJackson2HttpMessageConverter] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2020-12-27 03:32:48.935 INFO 26012 --- [ restartedMain] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.data.rest.webmvc.config.RepositoryRestMvcConfiguration' of type [org.springframework.data.rest.webmvc.config.RepositoryRestMvcConfiguration] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2020-12-27 03:32:49.190 INFO 26012 --- [ restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2020-12-27 03:32:49.197 INFO 26012 --- [ restartedMain] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2020-12-27 03:32:49.197 INFO 26012 --- [ restartedMain] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.41]
2020-12-27 03:32:49.278 INFO 26012 --- [ restartedMain] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2020-12-27 03:32:49.279 INFO 26012 --- [ restartedMain] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1364 ms
2020-12-27 03:32:49.512 INFO 26012 --- [ restartedMain] o.hibernate.jpa.internal.util.LogHelper : HHH000204: Processing PersistenceUnitInfo [name: default]
2020-12-27 03:32:49.546 INFO 26012 --- [ restartedMain] org.hibernate.Version : HHH000412: Hibernate ORM core version 5.4.25.Final
2020-12-27 03:32:49.620 INFO 26012 --- [ restartedMain] o.hibernate.annotations.common.Version : HCANN000001: Hibernate Commons Annotations 5.1.2.Final
2020-12-27 03:32:49.682 INFO 26012 --- [ restartedMain] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting...
2020-12-27 03:32:49.924 INFO 26012 --- [ restartedMain] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Start completed.
2020-12-27 03:32:49.933 INFO 26012 --- [ restartedMain] org.hibernate.dialect.Dialect : HHH000400: Using dialect: org.hibernate.dialect.MySQL5InnoDBDialect
2020-12-27 03:32:50.049 INFO 26012 --- [ restartedMain] o.h.e.t.j.p.i.JtaPlatformInitiator : HHH000490: Using JtaPlatform implementation: [org.hibernate.engine.transaction.jta.platform.internal.NoJtaPlatform]
2020-12-27 03:32:50.056 INFO 26012 --- [ restartedMain] j.LocalContainerEntityManagerFactoryBean : Initialized JPA EntityManagerFactory for persistence unit 'default'
2020-12-27 03:32:50.135 WARN 26012 --- [ restartedMain] JpaBaseConfiguration$JpaWebConfiguration : spring.jpa.open-in-view is enabled by default. Therefore, database queries may be performed during view rendering. Explicitly configure spring.jpa.open-in-view to disable this warning
2020-12-27 03:32:50.374 INFO 26012 --- [ restartedMain] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor'
2020-12-27 03:32:50.954 INFO 26012 --- [ restartedMain] o.s.s.web.DefaultSecurityFilterChain : Will secure any request with [org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter@6707114e, org.springframework.security.web.context.SecurityContextPersistenceFilter@20e3d55, org.springframework.security.web.header.HeaderWriterFilter@10647f40, org.springframework.security.web.csrf.CsrfFilter@17135eb0, org.springframework.security.web.authentication.logout.LogoutFilter@297f9882, org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter@21beac54, org.springframework.security.web.authentication.ui.DefaultLoginPageGeneratingFilter@2741bf4a, org.springframework.security.web.authentication.ui.DefaultLogoutPageGeneratingFilter@425f1341, org.springframework.security.web.authentication.www.BasicAuthenticationFilter@5e42e0a, org.springframework.security.web.savedrequest.RequestCacheAwareFilter@7df3f08, org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter@51e53a6e, org.springframework.security.web.authentication.AnonymousAuthenticationFilter@666fe17e, org.springframework.security.web.session.SessionManagementFilter@46a96507, org.springframework.security.web.access.ExceptionTranslationFilter@7edc01a5, org.springframework.security.web.access.intercept.FilterSecurityInterceptor@460056c3]
2020-12-27 03:32:51.017 INFO 26012 --- [ restartedMain] o.s.b.d.a.OptionalLiveReloadServer : LiveReload server is running on port 8081
2020-12-27 03:32:51.050 INFO 26012 --- [ restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2020-12-27 03:32:51.059 INFO 26012 --- [ restartedMain] c.D.E.E.EspersWebsiteApplication : Started EspersWebsiteApplication in 3.585 seconds (JVM running for 4.305)
2020-12-27 03:33:11.148 INFO 26012 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring DispatcherServlet 'dispatcherServlet'
2020-12-27 03:33:11.149 INFO 26012 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Initializing Servlet 'dispatcherServlet'
2020-12-27 03:33:11.151 INFO 26012 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Completed initialization in 2 ms
这是我的 DTO / 实体
package entities;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import static javax.persistence.GenerationType.IDENTITY;
import javax.persistence.Id;
import javax.validation.constraints.Email;
import java.time.Instant;
@Entity
@Data
@NoArgsConstructor
@AllArgsConstructor
public class User
@Id
@GeneratedValue(strategy = IDENTITY)
private Long userID;
private String username;
private String password;
@Email
private String email;
private Instant createdDate;
private boolean enabled;
我的用户存储库
package repos;
import entities.User;
import org.springframework.data.repository.CrudRepository;
public interface UserRepository extends CrudRepository<User, Long>
最后，这是我的 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>2.4.1</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.Donobuz.Espers</groupId>
<artifactId>Espers_Website</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>Espers_Website</name>
<description>A web application with many features to help gamers</description>
<properties>
<java.version>11</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-rest</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-mail</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>jakarta.validation</groupId>
<artifactId>jakarta.validation-api</artifactId>
<version>2.0.2</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.22</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<excludes>
<exclude>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</exclude>
</excludes>
</configuration>
</plugin>
</plugins>
</build>
</project>
【问题讨论】：
【参考方案1】：试试这个spring.jpa.hibernate.ddl-auto=update
【讨论】：
感谢您的快速回复！在在这里发布问题之前，我已经尝试过了。那没有用。 不幸的是没有【参考方案2】：我已经找到了答案：
我还必须在应用程序属性中声明spring.jpa.generate-ddl=true。然后使用正确的列正确创建了指定的表
【讨论】：
【参考方案3】：请在 URL 中附加一些属性（如果您想自动生成数据库）
spring.datasource.url=jdbc:mysql://localhost:3306/espersdb?createDatabaseIfNotExist=true
spring.jpa.hibernate.ddl-auto=update
@Entity
@Data
@NoArgsConstructor
@AllArgsConstructor
@Table(name="User") // missing in your code
public class User
//blah blah
【讨论】：
我实际上在使用@Table 注释时遇到了错误。使用 @Entity(name="") 效果更好并且不会引发错误。 你在导入“javax.persistence.Table”包吗？以上是关于Maven Spring Boot 尝试连接到 MySQL的主要内容，如果未能解决你的问题，请参考以下文章
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