复制[main] ERROR jdbc.audit - 2. Statement.execute(select 1) select 1   com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure  The last packet successfully received from the server was 576,及R决办539 milliseconds ago.  The last packet sent successfully to the server was 5 milliseconds ago.          at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)          at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)          at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)          at java.lang.reflect.Constructor.newInstance(Constructor.java:423)          at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)          at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:990)          at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3559)          at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3459)          at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3900)          at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2527)          at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2680)          at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2480)          at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2438)          at com.mysql.jdbc.StatementImpl.executeInternal(StatementImpl.java:845)          at com.mysql.jdbc.StatementImpl.execute(StatementImpl.java:745)          at net.sf.log4jdbc.StatementSpy.execute(StatementSpy.java:842)          at com.zaxxer.hikari.pool.PoolBase.isConnectionAlive(PoolBase.java:158)          at com.zaxxer.hikari.pool.HikariPool.getConnection(HikariPool.java:172)          at com.zaxxer.hikari.pool.HikariPool.getConnection(HikariPool.java:148)          at com.zaxxer.hikari.HikariDataSource.getConnection(HikariDataSource.java:100)          at cn.yingmi.hikari.Main.main(Main.java:30)  Caused by: java.io.EOFException: Can notread response from server. Expected toread 4 bytes, read 0 bytes before connection was unexpectedly lost.          at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:3011)          at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3469)          ... 14 more  1.2.3.4.5.6.7.8.9.10.11.12.13.14.15.16.17.18.19.20.21.22.23.24.25.26.27.28.29.30.