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.jdbc.Driver

### The error may exist in mapper/userDao-mapping.xml

### The error may involve com.zcz.learnmybatis.dao.UserDao.findUserById

### 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.jdbc.Driver

    at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:26)

    at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:111)

    at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:102)

    at org.apache.ibatis.session.defaults.DefaultSqlSession.selectOne(DefaultSqlSession.java:66)

    at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:68)

    at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:52)

    at com.sun.proxy.$Proxy2.findUserById(Unknown Source)

    at com.zcz.test.UserDaoTest.finUserById(UserDaoTest.java:20)

    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:497)

    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)

    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)

    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)

    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)

    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)

    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)

    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)

    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)

    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)

    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)

    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)

    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)

    at org.junit.runners.ParentRunner.run(ParentRunner.java:309)

    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)

    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)

    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:538)

    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:760)

    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:460)

    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:206)

Caused by: java.sql.SQLException: Error setting driver on UnpooledDataSource. Cause: java.lang.ClassNotFoundException: Cannot find class: com.mysql.jdbc.Driver

    at org.apache.ibatis.datasource.unpooled.UnpooledDataSource.initializeDriver(UnpooledDataSource.java:215)

    at org.apache.ibatis.datasource.unpooled.UnpooledDataSource.doGetConnection(UnpooledDataSource.java:194)

    at org.apache.ibatis.datasource.unpooled.UnpooledDataSource.doGetConnection(UnpooledDataSource.java:190)

    at org.apache.ibatis.datasource.unpooled.UnpooledDataSource.getConnection(UnpooledDataSource.java:92)

    at org.apache.ibatis.datasource.pooled.PooledDataSource.popConnection(PooledDataSource.java:375)

    at org.apache.ibatis.datasource.pooled.PooledDataSource.getConnection(PooledDataSource.java:84)

    at org.apache.ibatis.transaction.jdbc.JdbcTransaction.openConnection(JdbcTransaction.java:134)

    at org.apache.ibatis.transaction.jdbc.JdbcTransaction.getConnection(JdbcTransaction.java:61)

    at org.apache.ibatis.executor.BaseExecutor.getConnection(BaseExecutor.java:279)

    at org.apache.ibatis.executor.SimpleExecutor.prepareStatement(SimpleExecutor.java:72)

    at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:59)

    at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:267)

    at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:137)

    at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:96)

    at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:77)

    at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:108)

    ... 29 more