org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [com.mchange.v2.c3p0.ComboPooledDataSource] for bean 缺少c3p0包
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import javax.sql.DataSource; //DataSource不能引错 java.lang.ClassCastException: com.mchange.v2.c3p0.ComboPooledDataSource cannot be cast to javax.activation.DataSource
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