c3p0連接池啓動報錯：Caused by: java.lang.NoClassDefFoundError: com/mchange/v2/cfg/MConfig？

報錯：項目啓動報錯： Caused by: java.lang.AbstractMethodError: Method com/mchange/v2/c3p0/impl/NewProxyPreparedStatement.isClosed()Z is abstract at com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.isClosed(N

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