java.lang.ClassNotFoundException: com.mysql.jdbc.Driver

再贴出来一个我刚刚遇见的问题（我也不想遇见那么多问题啊啊啊啊





）：

org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot load JDBC driver class 'com.mysql.jdbc.Driver'

    at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:80)

    at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:575)

    at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:639)

    at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:668)

    at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:676)

    at org.springframework.jdbc.core.JdbcTemplate.queryForObject(JdbcTemplate.java:731)

    at im.qingtui.flag.dao.NationalDao.getFlagColors(NationalDao.java:23)

    at im.qingtui.flag.services.NationalService.getFlagColors(NationalService.java:19)

    at GetFlagColorsTest.test(GetFlagColorsTest.java:22)

    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

    at java.lang.reflect.Method.invoke(Method.java:606)

    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.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74)

    at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:83)

    at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72)

    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:231)

    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.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)

    at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:71)

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

    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:174)

    at org.junit.runner.JUnitCore.run(JUnitCore.java:160)

    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)

    at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:51)

    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:237)

    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)

Caused by: org.apache.commons.dbcp.SQLNestedException: Cannot load JDBC driver class 'com.mysql.jdbc.Driver'

    at org.apache.commons.dbcp.BasicDataSource.createConnectionFactory(BasicDataSource.java:1429)

    at org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1371)

    at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:1044)

    at org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection(DataSourceUtils.java:111)

    at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:77)

    ... 35 more

Caused by: java.lang.ClassNotFoundException: com.mysql.jdbc.Driver

    at java.net.URLClassLoader$1.run(URLClassLoader.java:366)

    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)

    at java.security.AccessController.doPrivileged(Native Method)

    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)

    at java.lang.ClassLoader.loadClass(ClassLoader.java:425)

    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)

    at java.lang.ClassLoader.loadClass(ClassLoader.java:358)

    at org.apache.commons.dbcp.BasicDataSource.createConnectionFactory(BasicDataSource.java:1420)
    ... 39 more

这个问题就是没有引入一个包，就是mysql-connector-java，引入之后，问题就没了。这个要注意了