maven/mybatis Cannot find class: com.oracle.jdbc.driver解决方法

博客涉及信息技术领域,包含Java、MyBatis、Oracle数据库和Maven等关键内容。Java是常用编程语言,MyBatis是数据持久层框架,Oracle是知名数据库,Maven用于项目构建和依赖管理。

在这里插入图片描述

F:\apache-tomcat-9.0.111-windows-x64\apache-tomcat-9.0.111\bin\catalina.bat run [2025-10-28 04:40:19,403] Artifact ssma:war: Waiting for server connection to start artifact deployment... Using CATALINA_BASE: "C:\Users\ZhuanZ1\AppData\Local\JetBrains\IntelliJIdea2020.1\tomcat\Unnamed_ssma" Using CATALINA_HOME: "F:\apache-tomcat-9.0.111-windows-x64\apache-tomcat-9.0.111" Using CATALINA_TMPDIR: "F:\apache-tomcat-9.0.111-windows-x64\apache-tomcat-9.0.111" Using JRE_HOME: "C:\Program Files\Java\jdk1.8.0_202" Using CLASSPATH: "F:\apache-tomcat-9.0.111-windows-x64\apache-tomcat-9.0.111\bin\bootstrap.jar;F:\apache-tomcat-9.0.111-windows-x64\apache-tomcat-9.0.111\bin\tomcat-juli.jar" Using CATALINA_OPTS: "" Connected to the target VM, address: '127.0.0.1:55719', transport: 'socket' 28-Oct-2025 16:40:20.434 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Server.服务器版本: Apache Tomcat/9.0.111 28-Oct-2025 16:40:20.437 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 服务器构建: Oct 10 2025 14:13:20 UTC 28-Oct-2025 16:40:20.437 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 服务器版本号: 9.0.111.0 28-Oct-2025 16:40:20.437 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 操作系统名称: Windows 10 28-Oct-2025 16:40:20.437 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log OS.版本: 10.0 28-Oct-2025 16:40:20.437 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 架构: amd64 28-Oct-2025 16:40:20.437 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Java 环境变量: C:\Program Files\Java\jdk1.8.0_202\jre 28-Oct-2025 16:40:20.437 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Java虚拟机版本: 1.8.0_202-b08 28-Oct-2025 16:40:20.437 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log JVM.供应商: Oracle Corporation 28-Oct-2025 16:40:20.437 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log CATALINA_BASE: C:\Users\ZhuanZ1\AppData\Local\JetBrains\IntelliJIdea2020.1\tomcat\Unnamed_ssma 28-Oct-2025 16:40:20.437 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log CATALINA_HOME: F:\apache-tomcat-9.0.111-windows-x64\apache-tomcat-9.0.111 28-Oct-2025 16:40:20.438 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行参数: -Djava.util.logging.config.file=C:\Users\ZhuanZ1\AppData\Local\JetBrains\IntelliJIdea2020.1\tomcat\Unnamed_ssma\conf\logging.properties 28-Oct-2025 16:40:20.438 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行参数: -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager 28-Oct-2025 16:40:20.438 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行参数: -agentlib:jdwp=transport=dt_socket,address=127.0.0.1:55719,suspend=y,server=n 28-Oct-2025 16:40:20.438 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行参数: -javaagent:C:\Users\ZhuanZ1\AppData\Local\JetBrains\IntelliJIdea2020.1\captureAgent\debugger-agent.jar 28-Oct-2025 16:40:20.438 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行参数: -Dcom.sun.management.jmxremote= 28-Oct-2025 16:40:20.438 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行参数: -Dcom.sun.management.jmxremote.port=1099 28-Oct-2025 16:40:20.438 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行参数: -Dcom.sun.management.jmxremote.ssl=false 28-Oct-2025 16:40:20.438 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行参数: -Dcom.sun.management.jmxremote.password.file=C:\Users\ZhuanZ1\AppData\Local\JetBrains\IntelliJIdea2020.1\tomcat\Unnamed_ssma\jmxremote.password 28-Oct-2025 16:40:20.438 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行参数: -Dcom.sun.management.jmxremote.access.file=C:\Users\ZhuanZ1\AppData\Local\JetBrains\IntelliJIdea2020.1\tomcat\Unnamed_ssma\jmxremote.access 28-Oct-2025 16:40:20.438 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行参数: -Djava.rmi.server.hostname=127.0.0.1 28-Oct-2025 16:40:20.439 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行参数: -Djdk.tls.ephemeralDHKeySize=2048 28-Oct-2025 16:40:20.439 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行参数: -Djava.protocol.handler.pkgs=org.apache.catalina.webresources 28-Oct-2025 16:40:20.439 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行参数: -Dsun.io.useCanonCaches=false 28-Oct-2025 16:40:20.439 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行参数: -Dignore.endorsed.dirs= 28-Oct-2025 16:40:20.445 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行参数: -Dcatalina.base=C:\Users\ZhuanZ1\AppData\Local\JetBrains\IntelliJIdea2020.1\tomcat\Unnamed_ssma 28-Oct-2025 16:40:20.445 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行参数: -Dcatalina.home=F:\apache-tomcat-9.0.111-windows-x64\apache-tomcat-9.0.111 28-Oct-2025 16:40:20.445 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行参数: -Djava.io.tmpdir=F:\apache-tomcat-9.0.111-windows-x64\apache-tomcat-9.0.111 28-Oct-2025 16:40:20.448 信息 [main] org.apache.catalina.core.AprLifecycleListener.lifecycleEvent 使用APR版本[1.7.4]加载了基于APR的Apache Tomcat本机库[1.3.1]。 28-Oct-2025 16:40:20.448 信息 [main] org.apache.catalina.core.AprLifecycleListener.lifecycleEvent APR功能:IPv6[true]、sendfile[true]、accept filters[false]、random[true]、UDS [true]。 28-Oct-2025 16:40:20.448 信息 [main] org.apache.catalina.core.AprLifecycleListener.lifecycleEvent APR/OpenSSL配置:useAprConnector[false],useOpenSSL[true] 28-Oct-2025 16:40:20.452 信息 [main] org.apache.catalina.core.AprLifecycleListener.initializeSSL OpenSSL成功初始化 [OpenSSL 3.0.14 4 Jun 2024] 28-Oct-2025 16:40:20.670 信息 [main] org.apache.coyote.AbstractProtocol.init 初始化协议处理器 ["http-nio-8080"] 28-Oct-2025 16:40:20.685 信息 [main] org.apache.catalina.startup.Catalina.load 服务器在[456]毫秒内初始化 28-Oct-2025 16:40:20.714 信息 [main] org.apache.catalina.core.StandardService.startInternal 正在启动服务[Catalina] 28-Oct-2025 16:40:20.714 信息 [main] org.apache.catalina.core.StandardEngine.startInternal 正在启动 Servlet 引擎:[Apache Tomcat/9.0.111] 28-Oct-2025 16:40:20.726 信息 [main] org.apache.coyote.AbstractProtocol.start 开始协议处理句柄["http-nio-8080"] 28-Oct-2025 16:40:20.742 信息 [main] org.apache.catalina.startup.Catalina.start [56]毫秒后服务器启动 Connected to server [2025-10-28 04:40:20,968] Artifact ssma:war: Artifact is being deployed, please wait... 28-Oct-2025 16:40:22.987 信息 [RMI TCP Connection(3)-127.0.0.1] org.apache.jasper.servlet.TldScanner.scanJars 至少有一个JAR被扫描用于TLD但尚未包含TLD。 为此记录器启用调试日志记录,以获取已扫描但未在其中找到TLD的完整JAR列表。 在扫描期间跳过不需要的JAR可以缩短启动时间和JSP编译时间。 28-Oct-2025 16:40:23.052 信息 [RMI TCP Connection(3)-127.0.0.1] org.springframework.web.context.ContextLoader.initWebApplicationContext Root WebApplicationContext: initialization started 28-Oct-2025 16:40:23.981 警告 [RMI TCP Connection(3)-127.0.0.1] org.springframework.context.support.AbstractApplicationContext.refresh Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [spring/applicationContext.xml]: Invocation of init method failed; nested exception is org.springframework.core.NestedIOException: Failed to parse mapping resource: 'file [F:\apache-tomcat-9.0.111-windows-x64\apache-tomcat-9.0.111\webapps\ROOT\WEB-INF\classes\mapper\UserMapper.xml]'; nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. The XML location is 'file [F:\apache-tomcat-9.0.111-windows-x64\apache-tomcat-9.0.111\webapps\ROOT\WEB-INF\classes\mapper\UserMapper.xml]'. Cause: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias 'User'. Cause: java.lang.ClassNotFoundException: Cannot find class: User 28-Oct-2025 16:40:23.982 信息 [RMI TCP Connection(3)-127.0.0.1] com.alibaba.druid.support.logging.JakartaCommonsLoggingImpl.info {dataSource-0} closing ... 28-Oct-2025 16:40:23.985 严重 [RMI TCP Connection(3)-127.0.0.1] org.springframework.web.context.ContextLoader.initWebApplicationContext Context initialization failed org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [spring/applicationContext.xml]: Invocation of init method failed; nested exception is org.springframework.core.NestedIOException: Failed to parse mapping resource: 'file [F:\apache-tomcat-9.0.111-windows-x64\apache-tomcat-9.0.111\webapps\ROOT\WEB-INF\classes\mapper\UserMapper.xml]'; nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. The XML location is 'file [F:\apache-tomcat-9.0.111-windows-x64\apache-tomcat-9.0.111\webapps\ROOT\WEB-INF\classes\mapper\UserMapper.xml]'. Cause: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias 'User'. Cause: java.lang.ClassNotFoundException: Cannot find class: User at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1804) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:620) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:936) at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:918) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583) at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:401) at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:292) at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:103) at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4047) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:4489) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:164) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:597) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:569) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:601) at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1743) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:249) at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819) at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801) at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:445) at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:399) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:249) at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819) at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801) at com.sun.jmx.remote.security.MBeanServerAccessController.invoke(MBeanServerAccessController.java:468) at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1468) at javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:76) at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1309) at java.security.AccessController.doPrivileged(Native Method) at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1408) at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:829) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:357) at sun.rmi.transport.Transport$1.run(Transport.java:200) at sun.rmi.transport.Transport$1.run(Transport.java:197) at java.security.AccessController.doPrivileged(Native Method) at sun.rmi.transport.Transport.serviceCall(Transport.java:196) at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:573) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:834) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:688) at java.security.AccessController.doPrivileged(Native Method) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:687) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748) Caused by: org.springframework.core.NestedIOException: Failed to parse mapping resource: 'file [F:\apache-tomcat-9.0.111-windows-x64\apache-tomcat-9.0.111\webapps\ROOT\WEB-INF\classes\mapper\UserMapper.xml]'; nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. The XML location is 'file [F:\apache-tomcat-9.0.111-windows-x64\apache-tomcat-9.0.111\webapps\ROOT\WEB-INF\classes\mapper\UserMapper.xml]'. Cause: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias 'User'. Cause: java.lang.ClassNotFoundException: Cannot find class: User at org.mybatis.spring.SqlSessionFactoryBean.buildSqlSessionFactory(SqlSessionFactoryBean.java:613) at org.mybatis.spring.SqlSessionFactoryBean.afterPropertiesSet(SqlSessionFactoryBean.java:491) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1863) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1800) ... 59 more Caused by: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. The XML location is 'file [F:\apache-tomcat-9.0.111-windows-x64\apache-tomcat-9.0.111\webapps\ROOT\WEB-INF\classes\mapper\UserMapper.xml]'. Cause: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias 'User'. Cause: java.lang.ClassNotFoundException: Cannot find class: User at org.apache.ibatis.builder.xml.XMLMapperBuilder.configurationElement(XMLMapperBuilder.java:123) at org.apache.ibatis.builder.xml.XMLMapperBuilder.parse(XMLMapperBuilder.java:95) at org.mybatis.spring.SqlSessionFactoryBean.buildSqlSessionFactory(SqlSessionFactoryBean.java:611) ... 62 more Caused by: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias 'User'. Cause: java.lang.ClassNotFoundException: Cannot find class: User at org.apache.ibatis.builder.BaseBuilder.resolveClass(BaseBuilder.java:118) at org.apache.ibatis.builder.xml.XMLStatementBuilder.parseStatementNode(XMLStatementBuilder.java:76) at org.apache.ibatis.builder.xml.XMLMapperBuilder.buildStatementFromContext(XMLMapperBuilder.java:138) at org.apache.ibatis.builder.xml.XMLMapperBuilder.buildStatementFromContext(XMLMapperBuilder.java:131) at org.apache.ibatis.builder.xml.XMLMapperBuilder.configurationElement(XMLMapperBuilder.java:121) ... 64 more Caused by: org.apache.ibatis.type.TypeException: Could not resolve type alias 'User'. Cause: java.lang.ClassNotFoundException: Cannot find class: User at org.apache.ibatis.type.TypeAliasRegistry.resolveAlias(TypeAliasRegistry.java:128) at org.apache.ibatis.builder.BaseBuilder.resolveAlias(BaseBuilder.java:149) at org.apache.ibatis.builder.BaseBuilder.resolveClass(BaseBuilder.java:116) ... 68 more Caused by: java.lang.ClassNotFoundException: Cannot find class: User at org.apache.ibatis.io.ClassLoaderWrapper.classForName(ClassLoaderWrapper.java:196) at org.apache.ibatis.io.ClassLoaderWrapper.classForName(ClassLoaderWrapper.java:89) at org.apache.ibatis.io.Resources.classForName(Resources.java:261) at org.apache.ibatis.type.TypeAliasRegistry.resolveAlias(TypeAliasRegistry.java:124) ... 70 more 28-Oct-2025 16:40:24.000 严重 [RMI TCP Connection(3)-127.0.0.1] org.apache.catalina.core.StandardContext.startInternal 一个或多个listeners启动失败,更多详细信息查看对应的容器日志文件 28-Oct-2025 16:40:24.001 严重 [RMI TCP Connection(3)-127.0.0.1] org.apache.catalina.core.StandardContext.startInternal 由于之前的错误,Context[]启动失败 [2025-10-28 04:40:24,020] Artifact ssma:war: Error during artifact deployment. See server log for details. 28-Oct-2025 16:40:30.744 信息 [Catalina-utility-1] org.apache.catalina.startup.HostConfig.deployDirectory 把web 应用程序部署到目录 [F:\apache-tomcat-9.0.111-windows-x64\apache-tomcat-9.0.111\webapps\manager] 28-Oct-2025 16:40:30.804 信息 [Catalina-utility-1] org.apache.jasper.servlet.TldScanner.scanJars 至少有一个JAR被扫描用于TLD但尚未包含TLD。 为此记录器启用调试日志记录,以获取已扫描但未在其中找到TLD的完整JAR列表。 在扫描期间跳过不需要的JAR可以缩短启动时间和JSP编译时间。 28-Oct-2025 16:40:30.829 信息 [Catalina-utility-1] org.apache.catalina.startup.HostConfig.deployDirectory Web应用程序目录[F:\apache-tomcat-9.0.111-windows-x64\apache-tomcat-9.0.111\webapps\manager]的部署已在[84]毫秒内完成
最新发布
10-29
### 问题分析 在使用 MyBatis 时,出现如下异常: ``` Error setting driver on UnpooledDataSource. Cause: java.lang.ClassNotFoundException: Cannot find class: com.mysql.cj.jdbc.Driver ``` 该异常表明在运行时无法找到 MySQL JDBC 驱动类 `com.mysql.cj.jdbc.Driver`。此类问题通常与以下几个因素有关: - 项目未正确引入 MySQL JDBC 驱动依赖。 - 配置文件中使用的 JDBC URL 或驱动类名不匹配实际引入的 MySQL 版本。 - 使用了 Maven 或 Gradle 等构建工具,但依赖未被正确下载或引入到运行时类路径中。 ### 解决方案 #### 1. 添加 MySQL JDBC 依赖 确保在 `pom.xml`(Maven 项目)或 `build.gradle`(Gradle 项目)中添加了正确的 MySQL JDBC 驱动依赖。对于 MySQL 8.x 及以上版本,应使用 `mysql-connector-java` 8.x,并指定驱动类为 `com.mysql.cj.jdbc.Driver`。 Maven 示例配置如下: ```xml <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>8.0.33</version> </dependency> ``` 对于 MySQL 5.x,应使用 `com.mysql.jdbc.Driver` 并引入对应的 JDBC 驱动版本[^1]。 #### 2. 检查 JDBC URL 和驱动类配置 在 MyBatis 的配置文件 `mybatis-config.xml` 或 Spring Boot 的 `application.properties` 中,确保 JDBC URL 和驱动类的配置与使用的 MySQL 版本一致。 MyBatis 配置示例如下: ```xml <dataSource type="UNPOOLED"> <property name="driver" value="com.mysql.cj.jdbc.Driver"/> <property name="url" value="jdbc:mysql://localhost:3306/your_database?useSSL=false&serverTimezone=UTC"/> <property name="username" value="root"/> <property name="password" value="password"/> </dataSource> ``` Spring Boot 配置示例如下: ```properties spring.datasource.url=jdbc:mysql://localhost:3306/your_database?useSSL=false&serverTimezone=UTC spring.datasource.username=root spring.datasource.password=password spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver ``` #### 3. 确保依赖被正确加载 如果使用 Maven 构建项目,运行以下命令以确保依赖被正确下载并加入类路径: ```bash mvn clean install ``` 在 IDE 中(如 IntelliJ IDEA),检查项目模块的依赖是否包含 `mysql-connector-java`。如果没有,请手动刷新 Maven 依赖或重新导入项目[^2]。 #### 4. 检查运行时类路径 在某些情况下,即使依赖已正确配置,也可能因运行时类路径缺失而导致驱动类无法加载。例如,使用命令行运行程序时,需确保 `mysql-connector-java.jar` 被包含在 `CLASSPATH` 中。 Java 命令行示例: ```bash java -cp .;path/to/mysql-connector-java-8.0.33.jar com.example.Main ``` #### 5. 检查 MySQL 版本与驱动类的兼容性 MySQL 5.x 使用 `com.mysql.jdbc.Driver`,而 MySQL 8.x 使用 `com.mysql.cj.jdbc.Driver`。如果项目中配置了错误的驱动类,将导致 `ClassNotFoundException`。请根据实际安装的 MySQL 版本调整驱动类配置[^5]。 ###
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