在学spring的JdbcTemplate时，连接数据库遇见的问题，求解答。
Exceptionencounteredduringcontextinitialization-cancellingrefreshattempt:org.springfr...
Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in class path resource [applicationContext.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.mchange.v2.c3p0.ComboPooledDataSource]: Constructor threw exception; nested exception is java.lang.NoClassDefFoundError: com/mchange/v2/cfg/MConfig
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nested exception is java.lang.NoClassDefFoundError
检查下是不是少jar包了
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其实是我jar包版本出错了，
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