springboot项目中的java错误

fgw7neuy  于 2021-07-16  发布在  Java
关注(0)|答案(2)|浏览(499)

这些天我在做一个简单的springboot项目。
当我在执行程序的时候，我发现我的代码中有一些错误我无法纠正。既然我是这方面的初学者，请帮我改正所有这些错误。
控制台输出：

  1. .   ____          _            __ _ _
  2.  /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
  3. ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
  4.  \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  5.   '  |____| .__|_| |_|_| |_\__, | / / / /
  6.  =========|_|==============|___/=/_/_/_/
  7.  :: Spring Boot ::                (v2.4.4)
  9. 2021-03-19 23:23:17.681  INFO 27256 --- [           main] com.petLodge.Seller.SellerApplication    : Starting SellerApplication using Java 15.0.1 on DESKTOP-03RUM8B with PID 27256 (F:\acadamics\SpringTutes\PetLodgeSeller\Seller\target\classes started by msi in F:\acadamics\SpringTutes\PetLodgeSeller\Seller)
  10. 2021-03-19 23:23:17.684  INFO 27256 --- [           main] com.petLodge.Seller.SellerApplication    : No active profile set, falling back to default profiles: default
  11. 2021-03-19 23:23:18.160  INFO 27256 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data JPA repositories in DEFAULT mode.
  12. 2021-03-19 23:23:18.170  INFO 27256 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 4 ms. Found 0 JPA repository interfaces.
  13. 2021-03-19 23:23:18.568  INFO 27256 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 9191 (http)
  14. 2021-03-19 23:23:18.577  INFO 27256 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
  15. 2021-03-19 23:23:18.577  INFO 27256 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.44]
  16. 2021-03-19 23:23:18.817  INFO 27256 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
  17. 2021-03-19 23:23:18.817  INFO 27256 --- [           main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1092 ms
  18. 2021-03-19 23:23:18.862  WARN 27256 --- [           main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaConfiguration': Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Hikari.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.zaxxer.hikari.HikariDataSource]: Factory method 'dataSource' threw exception; nested exception is java.lang.IllegalStateException: Cannot load driver class: com.mysql.cj.jdbc.Driver
  19. 2021-03-19 23:23:18.864  INFO 27256 --- [           main] o.apache.catalina.core.StandardService   : Stopping service [Tomcat]
  20. 2021-03-19 23:23:18.878  INFO 27256 --- [           main] ConditionEvaluationReportLoggingListener : 
  22. Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
  23. 2021-03-19 23:23:18.898 ERROR 27256 --- [           main] o.s.boot.SpringApplication               : Application run failed
  25. org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaConfiguration': Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Hikari.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.zaxxer.hikari.HikariDataSource]: Factory method 'dataSource' threw exception; nested exception is java.lang.IllegalStateException: Cannot load driver class: com.mysql.cj.jdbc.Driver
  26.     at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:800) ~[spring-beans-5.3.5.jar:5.3.5]
  27.     at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:229) ~[spring-beans-5.3.5.jar:5.3.5]
  28.     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1354) ~[spring-beans-5.3.5.jar:5.3.5]
  29.     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1204) ~[spring-beans-5.3.5.jar:5.3.5]
  30.     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:564) ~[spring-beans-5.3.5.jar:5.3.5]
  31.     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:524) ~[spring-beans-5.3.5.jar:5.3.5]
  32.     at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.5.jar:5.3.5]
  33.     at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.5.jar:5.3.5]
  34.     at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.5.jar:5.3.5]
  35.     at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.5.jar:5.3.5]
  36.     at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:410) ~[spring-beans-5.3.5.jar:5.3.5]
  37.     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1334) ~[spring-beans-5.3.5.jar:5.3.5]
  38.     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1177) ~[spring-beans-5.3.5.jar:5.3.5]
  39.     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:564) ~[spring-beans-5.3.5.jar:5.3.5]
  40.     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:524) ~[spring-beans-5.3.5.jar:5.3.5]
  41.     at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.5.jar:5.3.5]
  42.     at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.5.jar:5.3.5]
  43.     at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.5.jar:5.3.5]
  44.     at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.5.jar:5.3.5]
  45.     at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1154) ~[spring-context-5.3.5.jar:5.3.5]
  46.     at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:908) ~[spring-context-5.3.5.jar:5.3.5]
  47.     at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583) ~[spring-context-5.3.5.jar:5.3.5]
  48.     at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:144) ~[spring-boot-2.4.4.jar:2.4.4]
  49.     at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:769) ~[spring-boot-2.4.4.jar:2.4.4]
  50.     at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:761) ~[spring-boot-2.4.4.jar:2.4.4]
  51.     at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:426) ~[spring-boot-2.4.4.jar:2.4.4]
  52.     at org.springframework.boot.SpringApplication.run(SpringApplication.java:326) ~[spring-boot-2.4.4.jar:2.4.4]
  53.     at org.springframework.boot.SpringApplication.run(SpringApplication.java:1313) ~[spring-boot-2.4.4.jar:2.4.4]
  54.     at org.springframework.boot.SpringApplication.run(SpringApplication.java:1302) ~[spring-boot-2.4.4.jar:2.4.4]
  55.     at com.petLodge.Seller.SellerApplication.main(SellerApplication.java:11) ~[classes/:na]
  56. Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Hikari.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.zaxxer.hikari.HikariDataSource]: Factory method 'dataSource' threw exception; nested exception is java.lang.IllegalStateException: Cannot load driver class: com.mysql.cj.jdbc.Driver
  57.     at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:658) ~[spring-beans-5.3.5.jar:5.3.5]
  58.     at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:638) ~[spring-beans-5.3.5.jar:5.3.5]
  59.     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1334) ~[spring-beans-5.3.5.jar:5.3.5]
  60.     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1177) ~[spring-beans-5.3.5.jar:5.3.5]
  61.     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:564) ~[spring-beans-5.3.5.jar:5.3.5]
  62.     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:524) ~[spring-beans-5.3.5.jar:5.3.5]
  63.     at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.5.jar:5.3.5]
  64.     at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.5.jar:5.3.5]
  65.     at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.5.jar:5.3.5]
  66.     at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.5.jar:5.3.5]
  67.     at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) ~[spring-beans-5.3.5.jar:5.3.5]
  68.     at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1380) ~[spring-beans-5.3.5.jar:5.3.5]
  69.     at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1300) ~[spring-beans-5.3.5.jar:5.3.5]
  70.     at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:887) ~[spring-beans-5.3.5.jar:5.3.5]
  71.     at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:791) ~[spring-beans-5.3.5.jar:5.3.5]
  72.     ... 29 common frames omitted
  73. Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.zaxxer.hikari.HikariDataSource]: Factory method 'dataSource' threw exception; nested exception is java.lang.IllegalStateException: Cannot load driver class: com.mysql.cj.jdbc.Driver
  74.     at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185) ~[spring-beans-5.3.5.jar:5.3.5]
  75.     at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:653) ~[spring-beans-5.3.5.jar:5.3.5]
  76.     ... 43 common frames omitted
  77. Caused by: java.lang.IllegalStateException: Cannot load driver class: com.mysql.cj.jdbc.Driver
  78.     at org.springframework.util.Assert.state(Assert.java:97) ~[spring-core-5.3.5.jar:5.3.5]
  79.     at org.springframework.boot.autoconfigure.jdbc.DataSourceProperties.determineDriverClassName(DataSourceProperties.java:224) ~[spring-boot-autoconfigure-2.4.4.jar:2.4.4]
  80.     at org.springframework.boot.autoconfigure.jdbc.DataSourceProperties.initializeDataSourceBuilder(DataSourceProperties.java:176) ~[spring-boot-autoconfigure-2.4.4.jar:2.4.4]
  81.     at org.springframework.boot.autoconfigure.jdbc.DataSourceConfiguration.createDataSource(DataSourceConfiguration.java:48) ~[spring-boot-autoconfigure-2.4.4.jar:2.4.4]
  82.     at org.springframework.boot.autoconfigure.jdbc.DataSourceConfiguration$Hikari.dataSource(DataSourceConfiguration.java:90) ~[spring-boot-autoconfigure-2.4.4.jar:2.4.4]
  83.     at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
  84.     at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64) ~[na:na]
  85.     at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
  86.     at java.base/java.lang.reflect.Method.invoke(Method.java:564) ~[na:na]
  87.     at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) ~[spring-beans-5.3.5.jar:5.3.5]
  88.     ... 44 common frames omitted
  2. ***this is the prom.xml file.***you can see dependencies that I have used in the Spring - boot

程序。

  1. <?xml version="1.0" encoding="UTF-8"?>
  2. <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  3.     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
  4.     <modelVersion>4.0.0</modelVersion>
  5.     <parent>
  6.         <groupId>org.springframework.boot</groupId>
  7.         <artifactId>spring-boot-starter-parent</artifactId>
  8.         <version>2.4.4</version>
  9.         <relativePath/> <!-- lookup parent from repository -->
  10.     </parent>
  12.     <groupId>com.petLodge</groupId>
  13.     <artifactId>Seller</artifactId>
  14.     <version>0.0.1-SNAPSHOT</version>
  16.     <name>Seller</name>
  17.     <description>Demo project for Spring Boot</description>
  19.     <properties>
  20.         <java.version>11</java.version>
  21.     </properties>
  23.     <dependencies>
  24.         <dependency>
  25.             <groupId>org.springframework.boot</groupId>
  26.             <artifactId>spring-boot-starter-data-jpa</artifactId>
  27.         </dependency>
  28.         <dependency>
  29.             <groupId>org.springframework.boot</groupId>
  30.             <artifactId>spring-boot-starter-web</artifactId>
  31.         </dependency>
  32.         <dependency>
  33.             <groupId>org.springframework.boot</groupId>
  34.             <artifactId>spring-boot-starter-jdbc</artifactId>
  35.         </dependency>
  36.         <dependency>
  37.             <groupId>mysql</groupId>
  38.             <artifactId>mysql-connector-java</artifactId>
  39.             <version>5.1.9</version>
  40.             <scope>runtime</scope>
  41.         </dependency>
  42.         <dependency>
  43.             <groupId>org.springframework.boot</groupId>
  44.             <artifactId>spring-boot-starter-test</artifactId>
  45.             <scope>test</scope>
  46.         </dependency>
  47.     </dependencies>
  49.     <build>
  50.         <plugins>
  51.             <plugin>
  52.                 <groupId>org.springframework.boot</groupId>
  53.                 <artifactId>spring-boot-maven-plugin</artifactId>
  54.             </plugin>
  55.         </plugins>
  56.     </build>
  57. </project>

来自的代码段 aplication.properties 文件：

  1. spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
  2. spring.datasource.url=jdbc:mysql://localhost:3306/Petlodgeplatform?useUnicode=true&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&server
  3. spring.datasource.username=root
  4. spring.datasource.password=root1
  6. spring.jpa.hibernate.ddl-auto=update
  7. spring.jpa.generate-ddl=true
  8. spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL5InnoDBDialect
  10. spring.jpa.show-sql=true
  11. debug = true
  12. server.port = 9191
Javaspringspring-bootspring-mvcmysql-connector

2条答案

按热度按时间
z6psavjg

z6psavjg1#

尝试修改application.properties文件。

  1. spring.datasource.hikari.jdbc-url=jdbc:mysql://localhost: 3306/Petlodgeplatform?useUnicode=true&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&server
  2. spring.datasource.hikari.password=root
  3. spring.datasource.hikari.username=root1
  4. spring.datasource.hikari.driver-class-name=com.mysql.cj.jdbc.Driver
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s4n0splo

s4n0splo2#

您的mysql connector java版本与diver类不匹配。查看此处了解更多信息https://dev.mysql.com/doc/connector-j/8.0/en/connector-j-api-changes.html. 因此，删除版本为：

  1. <dependency>
  2.     <groupId>mysql</groupId>
  3.     <artifactId>mysql-connector-java</artifactId>
  4. </dependency>

方言也变了 org.hibernate.dialect.MySQL8Dialect

赞(0）分享  回复(0）举报  2021-07-16
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