这个异常怎么解决 谢谢!

ibatis写的增删改差连接的mysql数据库.谢谢!
三月 26, 2018 1:51:08 下午 com.ibatis.common.logging.jdk14.Jdk14LoggingImpl error
严重: SimpleDataSource: Error while loading properties. Cause: java.lang.ClassNotFoundException: driver
java.lang.ClassNotFoundException: 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 java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:195)
at com.ibatis.common.resources.Resources.classForName(Resources.java:265)
at com.ibatis.common.resources.Resources.instantiate(Resources.java:281)
at com.ibatis.common.jdbc.SimpleDataSource.initialize(SimpleDataSource.java:199)
at com.ibatis.common.jdbc.SimpleDataSource.(SimpleDataSource.java:116)
at com.ibatis.sqlmap.engine.datasource.SimpleDataSourceFactory.initialize(SimpleDataSourceFactory.java:31)
at com.ibatis.sqlmap.engine.builder.xml.SqlMapConfigParser$9.process(SqlMapConfigParser.java:347)
at com.ibatis.common.xml.NodeletParser.processNodelet(NodeletParser.java:121)
at com.ibatis.common.xml.NodeletParser.process(NodeletParser.java:105)
at com.ibatis.common.xml.NodeletParser.process(NodeletParser.java:102)
at com.ibatis.common.xml.NodeletParser.process(NodeletParser.java:102)
at com.ibatis.common.xml.NodeletParser.parse(NodeletParser.java:72)
at com.ibatis.common.xml.NodeletParser.parse(NodeletParser.java:51)
at com.ibatis.sqlmap.engine.builder.xml.SqlMapConfigParser.parse(SqlMapConfigParser.java:86)
at com.ibatis.sqlmap.client.SqlMapClientBuilder.buildSqlMapClient(SqlMapClientBuilder.java:63)
at com.ahedu.IStudentDAOImpl.(IStudentDAOImpl.java:16)

Exception in thread "main" java.lang.ExceptionInInitializerError
Caused by: java.lang.RuntimeException: Error occurred. Cause: com.ibatis.common.xml.NodeletException: Error parsing XML. Cause: java.lang.RuntimeException: Error parsing XPath '/sqlMapConfig/transactionManager/dataSource/end()'. Cause: com.ibatis.sqlmap.client.SqlMapException: Error initializing DataSource. Could not instantiate DataSourceFactory. Cause: java.lang.RuntimeException: SimpleDataSource: Error while loading properties. Cause: java.lang.ClassNotFoundException: driver
at com.ibatis.sqlmap.engine.builder.xml.SqlMapConfigParser.parse(SqlMapConfigParser.java:89)
at com.ibatis.sqlmap.client.SqlMapClientBuilder.buildSqlMapClient(SqlMapClientBuilder.java:63)
at com.ahedu.IStudentDAOImpl.(IStudentDAOImpl.java:16)
Caused by: com.ibatis.common.xml.NodeletException: Error parsing XML. Cause: java.lang.RuntimeException: Error parsing XPath '/sqlMapConfig/transactionManager/dataSource/end()'. Cause: com.ibatis.sqlmap.client.SqlMapException: Error initializing DataSource. Could not instantiate DataSourceFactory. Cause: java.lang.RuntimeException: SimpleDataSource: Error while loading properties. Cause: java.lang.ClassNotFoundException: driver
at com.ibatis.common.xml.NodeletParser.parse(NodeletParser.java:53)
at com.ibatis.sqlmap.engine.builder.xml.SqlMapConfigParser.parse(SqlMapConfigParser.java:86)
... 2 more
Caused by: java.lang.RuntimeException: Error parsing XPath '/sqlMapConfig/transactionManager/dataSource/end()'. Cause: com.ibatis.sqlmap.client.SqlMapException: Error initializing DataSource. Could not instantiate DataSourceFactory. Cause: java.lang.RuntimeException: SimpleDataSource: Error while loading properties. Cause: java.lang.ClassNotFoundException: driver
at com.ibatis.common.xml.NodeletParser.processNodelet(NodeletParser.java:123)
at com.ibatis.common.xml.NodeletParser.process(NodeletParser.java:105)
at com.ibatis.common.xml.NodeletParser.process(NodeletParser.java:102)
at com.ibatis.common.xml.NodeletParser.process(NodeletParser.java:102)
at com.ibatis.common.xml.NodeletParser.parse(NodeletParser.java:72)
at com.ibatis.common.xml.NodeletParser.parse(NodeletParser.java:51)
... 3 more
Caused by: com.ibatis.sqlmap.client.SqlMapException: Error initializing DataSource. Could not instantiate DataSourceFactory. Cause: java.lang.RuntimeException: SimpleDataSource: Error while loading properties. Cause: java.lang.ClassNotFoundException: driver
at com.ibatis.sqlmap.engine.builder.xml.SqlMapConfigParser$9.process(SqlMapConfigParser.java:354)
at com.ibatis.common.xml.NodeletParser.processNodelet(NodeletParser.java:121)
... 8 more
Caused by: java.lang.RuntimeException: SimpleDataSource: Error while loading properties. Cause: java.lang.ClassNotFoundException: driver
at com.ibatis.common.jdbc.SimpleDataSource.initialize(SimpleDataSource.java:210)
at com.ibatis.common.jdbc.SimpleDataSource.(SimpleDataSource.java:116)
at com.ibatis.sqlmap.engine.datasource.SimpleDataSourceFactory.initialize(SimpleDataSourceFactory.java:31)
at com.ibatis.sqlmap.engine.builder.xml.SqlMapConfigParser$9.process(SqlMapConfigParser.java:347)
... 9 more
Caused by: java.lang.ClassNotFoundException: 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 java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:195)
at com.ibatis.common.resources.Resources.classForName(Resources.java:265)
at com.ibatis.common.resources.Resources.instantiate(Resources.java:281)
at com.ibatis.common.jdbc.SimpleDataSource.initialize(SimpleDataSource.java:199)
... 12 more

什么原因啊 弄了好久了!

mysql 驱动包没有导入吧

确认配置文件是否正确的导入并使用。

导一个mysql的驱动jar包

mysql-connector 没有导入或者版本不匹配,换一个jar包

dbcp的jar包

value的值应该为jdbc.driver

检查一下驱动jar包 或者观察xml文件 com.mysql.jdbc.Driver是否书写正确

请到mysql的官方网站下载 mysql的java的驱动包,放到lib下面就行了

看看是否导入了驱动包。

SimpleDataSource.java 错误位置如下：
.......省略获取配置的代码
Resources.instantiate(jdbcDriver);

    if (poolPingEnabled && (!props.containsKey(PROP_POOL_PING_QUERY) || prop_pool_ping_query.trim().length() == 0)) {
      throw new RuntimeException("SimpleDataSource: property '" + PROP_POOL_PING_ENABLED
          + "' is true, but property '" + PROP_POOL_PING_QUERY + "' is not set correctly.");
    }
  }

} catch (Exception e) {
  throw new RuntimeException("SimpleDataSource: Error while loading properties. Cause: " + e, e);
}

主要就在Resources.instantiate(jdbcDriver);这个位置。
这里就是根据配置的DriverClass 来查找类
public static Class classForName(String className) throws ClassNotFoundException {
Class clazz = null;
try {
clazz = getClassLoader().loadClass(className);
} catch (Exception e) {
// Ignore. Failsafe below.
}
if (clazz == null) {
clazz = Class.forName(className);
}
return clazz;
}
所以，看一下添加的jar是否在classpath下，或者classpath下有没有这个类，用eclipse的视图也很好找

看下SpringContext.xml文件配置是否正确，注意大小写

<content:property-placeholder location="classpath:dbconfig.properties" />
<bean id="pooledDAtaSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
    <property name="jdbcUrl" value="${jdbc.url}" />
    <property name="user" value="${jdbc.user}" />
    <property name="password" value="${jdbc.password}" />
    <property name="driverClass" value="${jdbc.driver}" />
</bean>