spring 配置文件在配置数据源时报错

我的配置

报错信息：
SEVERE: Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'upidaDB' defined in ServletContext resource [/WEB-INF/spring/spring-data.xml]: Error setting property values; nested exception is org.springframework.beans.PropertyBatchUpdateException; nested PropertyAccessExceptions (1) are:
PropertyAccessException 1: org.springframework.beans.MethodInvocationException: Property 'driverClassName' threw exception; nested exception is java.lang.IllegalStateException: Could not load JDBC driver class [com.microsoft.sqlserver.jdbc.SQLServerDriver]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1423)

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急急急，在线等。。。。。。。。。。。。。。。。。。。。。。。。。