java.lang.ClassNotFoundException: Cannot find class:

运行test的时候报错java.lang.ClassNotFoundException: Cannot find class：XXX
看了下这里是说我找不到

org.apache.ibatis.exceptions.PersistenceException:
### Error querying database.  Cause: java.sql.SQLException: Error setting driver on UnpooledDataSource. Cause: java.lang.ClassNotFoundException: Cannot find class: com.mysql.jc.jdbc.Driver
### The error may exist in com/sandwich/dao/UserMapper.xml
### The error may involve com.sandwich.dao.UserDao.getUserList
### The error occurred while executing a query
### Cause: java.sql.SQLException: Error setting driver on UnpooledDataSource. Cause: java.lang.ClassNotFoundException: Cannot find class: com.mysql.jc.jdbc.Driverat org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:149)at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:140)at org.apache.ibatis.binding.MapperMethod.executeForMany(MapperMethod.java:147)at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:80)at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:57)at com.sun.proxy.$Proxy4.getUserList(Unknown Source)at com.sandwich.dao.UserDaoTest.test(UserDaoTest.java:18)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.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)at org.junit.runners.ParentRunner.run(ParentRunner.java:363)at org.junit.runner.JUnitCore.run(JUnitCore.java:137)at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:230)at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:58)
Caused by: java.sql.SQLException: Error setting driver on UnpooledDataSource. Cause: java.lang.ClassNotFoundException: Cannot find class: com.mysql.jc.jdbc.Driverat org.apache.ibatis.datasource.unpooled.UnpooledDataSource.initializeDriver(UnpooledDataSource.java:241)at org.apache.ibatis.datasource.unpooled.UnpooledDataSource.doGetConnection(UnpooledDataSource.java:220)at org.apache.ibatis.datasource.unpooled.UnpooledDataSource.doGetConnection(UnpooledDataSource.java:216)at org.apache.ibatis.datasource.unpooled.UnpooledDataSource.getConnection(UnpooledDataSource.java:95)at org.apache.ibatis.datasource.pooled.PooledDataSource.popConnection(PooledDataSource.java:422)at org.apache.ibatis.datasource.pooled.PooledDataSource.getConnection(PooledDataSource.java:89)at org.apache.ibatis.transaction.jdbc.JdbcTransaction.openConnection(JdbcTransaction.java:138)at org.apache.ibatis.transaction.jdbc.JdbcTransaction.getConnection(JdbcTransaction.java:60)at org.apache.ibatis.executor.BaseExecutor.getConnection(BaseExecutor.java:336)at org.apache.ibatis.executor.SimpleExecutor.prepareStatement(SimpleExecutor.java:85)at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:62)at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:324)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:147)... 28 moreProcess finished with exit code -1

有的时候应该细心看下控制台的信息，不应该直接复制错误去百度
我发现我这里不能用com.mysql.cj.jdbc.Driver，当然我这个错是敲错成jc了，但换成cj还是不对，这是mysql-connector-java问题，我后来看了博客对这个知识点又有了新的认识。最后改成com.mysql.jdbc.Driver就好
一般报这个错都是找不到类什么的，就要看自己是不是引入错了，可能是xml里属性用的不对，也有可能是像我这样的

修改后运行成功

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