property datasource required

Hi I am using java springs I am using mysql as backend I am getting one error when i compile the application.property datasource required.

This is my dispatcher-servlet.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-2.0.xsd">

<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/"/>
<property name="suffix" value=".jsp"/>
</bean>


<bean name="/Department.htm" class="controller.salescontroller"/>
<bean id="DeptDaoImp" class="manager.DeptDaoImp"/>



<bean id="ds" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/pra"/>
<property name="username" value="root"/>
<property name="password" value="sa"/>
</bean>
<bean id="JdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource"><ref bean="ds" /></property>
</bean>
</beans>