java - 使用spring + mybatis时,java.lang.ClassNotFoundException: com.mysql.cj.jdbc.Drive发生
问题描述
我使用macos,idea,maven,spring,mybatis,druid,mysql8.0.20进行SQL测试,但是java.lang.ClassNotFoundException: com.mysql.cj.jdbc.Drive
发生了。pom.xml
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.20</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.4.6</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
<dependency>
<groupId>c3p0</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.1.2</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.8</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.2.2</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>4.2.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>4.1.3.RELEASE</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.1.3.RELEASE</version>
</dependency>
错误信息:
at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:80)
at org.mybatis.spring.transaction.SpringManagedTransaction.openConnection(SpringManagedTransaction.java:81)
at org.mybatis.spring.transaction.SpringManagedTransaction.getConnection(SpringManagedTransaction.java:67)
at org.apache.ibatis.executor.BaseExecutor.getConnection(BaseExecutor.java:338)
at org.apache.ibatis.executor.SimpleExecutor.prepareStatement(SimpleExecutor.java:84)
at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:62)
at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:326)
at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:156)
at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:109)
at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:83)
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:148)
... 41 more
Caused by: java.sql.SQLException: com.mysql.cj.jdbc.Drive
at com.alibaba.druid.util.JdbcUtils.createDriver(JdbcUtils.java:596)
at com.alibaba.druid.pool.DruidDataSource.init(DruidDataSource.java:815)
at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:1222)
at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:1218)
at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:90)
at org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection(DataSourceUtils.java:111)
at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:77)
... 51 more
Caused by: java.lang.ClassNotFoundException: com.mysql.cj.jdbc.Drive
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:264)
at com.alibaba.druid.util.JdbcUtils.createDriver(JdbcUtils.java:594)
... 57 more
春天的xml:
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd">
<context:property-placeholder location="classpath:properties/*.properties"/>
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"
destroy-method="close">
<property name="driverClassName" value="${jdbc.driver}"/>
<property name="url"
value="jdbc:mysql://${jdbc.host}:3306/${jdbc.database}?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8&zeroDateTimeBehavior=convertToNull"/>
<property name="username" value="${jdbc.userName}"/>
<property name="password" value="${jdbc.passWord}"/>
<property name="initialSize" value="${jdbc.initialSize}"></property>
<property name="maxActive" value="${jdbc.maxActive}"/>
<property name="minIdle" value="${jdbc.minIdle}"></property>
<property name="maxWait" value="${jdbc.maxWait}"></property>
</bean>
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<property name="mapperLocations" value="classpath:mappers/*.xml"/>
<!--<property name="configLocation" value="classpath:mybatis-config.xml" />-->
</bean>
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.wlw.mybatis.mapper"/>
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
</bean>
<bean id="transactionManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"/>
</bean>
</beans>
测试代码:
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = "classpath:spring/applicationContext*.xml")
public class OrderMapperSpringTest {
@Autowired
private OrderMapper orderMapper;
@Test
public void queryOrderByOrderId() throws Exception {
Class.forName("com.mysql.cj.jdbc.Driver"); // this is ok
Order re = this.orderMapper.queryOrderByOrderId("1"); //error occurs here!!!
System.out.printf("orderId:%s,userId:%s,user.id:%s,userName:%s,userYear:%s,detail:%s",re.getId(),re.getUserId(),re.getUser().getId(),re.getUser().getName(),re.getUser().getYear(),re.getDetail());
}
@Test
public void queryOrderDetailByOrderId() throws Exception {
}
}
我试了很多次,把pom.xml中的每个包版本都改了,改成durid
同样c3p0
的错误,我确保mysql连接器导入成功,甚至将pom.xml中的mysql连接器代码复制mysql-connector-java-8.0.20.jar
到资源文件夹中,并添加到项目中idea module setting
。
解决方案
财产的价值${jdbc.driver}
拼写错误。检查您的属性文件并验证其值。
它当前具有 value com.mysql.cj.jdbc.Drive
,因此最后缺少 an r
。
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