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java.lang.NullPointerException: 	at com.alibaba.druid.pool.vendor.MySqlValidConnectionChecker.(MySqlValidConnectionChecker.java:48)	at com.alibaba.druid.pool.DruidDataSource.initValidConnectionChecker(DruidDataSource.java:945)	at com.alibaba.druid.pool.DruidDataSource.init(DruidDataSource.java:660)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)