2017-12-29 10:43:19,776 ERROR [com.alibaba.druid.pool.DruidDataSource] - <init datasource error, url: jdbc:mysql://localhost:3306/hxrc>

com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

Last packet sent to the server was 0 ms ago.

    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)

    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)

    at java.lang.reflect.Constructor.newInstance(Unknown Source)

    at com.mysql.jdbc.Util.handleNewInstance(Util.java:406)

    at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1074)

    at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2103)

    at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:718)

    at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:46)

    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)

    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)

    at java.lang.reflect.Constructor.newInstance(Unknown Source)

    at com.mysql.jdbc.Util.handleNewInstance(Util.java:406)

    at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:302)

    at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:282)

    at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:148)

    at com.alibaba.druid.filter.stat.StatFilter.connection_connect(StatFilter.java:211)

    at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:142)

    at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1377)

    at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1431)

    at com.alibaba.druid.pool.DruidDataSource.init(DruidDataSource.java:632)

    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

    at java.lang.reflect.Method.invoke(Unknown Source)