tomcat启动的时候没有错误，但是进行数据库操作就会有错误。
在网上找了很久 好不容易找到解决方法
转自 http://blog.csdn.net/ro_bot/article/details/51659502
出现以上错误原因是：数据源的错误配置：
错误的jdbc.properties
driver=com.mysql.jdbc.Driver url=jdbc:mysql://localhost:3306/seckill username=root password=root
错误的spring.xml
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" 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.xsd"> <context:property-placeholder location="jdbc.properties"/> <bean id="dataSource" destroy-method="close" class="org.apache.commons.dbcp.BasicDataSource" > <property name="driverClass" value="${driver}"/> <property name="url" value="${url}" /> <property name="username" value="${username}" /> <property name="password" value="${password}" /> </beans>
将配置修改为：
jdbc.properties
jdbc.driver=com.mysql.jdbc.Driver jdbc.url=jdbc:mysql://localhost:3306/seckill jdbc.username=root jdbc.password=root
spring-dao.xml
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd"> <context:property-placeholder location="jdbc.properties"/> <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close"> <property name="driverClass" value="${jdbc.driver}"/> <property name="url" value="${jdbc.url}"/> <property name="username" value="${jdbc.username}"/> <property name="password" value="${jdbc.password}"/> </bean> </beans>
配置完后成功运行。