Last packet sent to the server was 3 ms ago. at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2579) at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2867) at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1616) at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1708) at com.mysql.jdbc.Connection.execSQL(Connection.java:3255) at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1293) at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:1428)
This led me to research whether this could be a MySQL issue. It turns out, that the connection pool will close all connections after eight hours of inactivity. Their solution of using the "
autoReconnect" property apparently will not work under most circumstances. This is covered in section 22.214.171.124.4 on the MySQL reference manual.
The solution? Well it has been suggested the writing a small daemon thread which wakes up every hour and executes some small query should be sufficient to keep the connections open. I have not implemented this yet, but this seems reasonable. In my case I'll probably tie it to one of my servlets in their