Java JDBC для MySQL отказ связи

Question

У меня есть сервер с подключением JDBC MySQL, но каждое утро я получил эту ошибку, когда я проверяю сервер:

java.sql.SQLException: Сбой связи ссылки: Java .io.EOFException, основная причина: нулевой

** НАЧАТЬ вложенное ИСКЛЮЧЕНИЕ **

java.io.EOFException

StackTrace:

java.io.EOFException на com.mysql.jdbc.MysqlIO.readFully (MysqlIO.java:1395) в com.mysql.jdbc.MysqlIO.reuseAndReadPacket (MysqlIO.java:1539) на com.mysql. jdbc.MysqlIO.checkErrorPacket (MysqlIO.java:1930) на com.mysql.jdbc.MysqlIO.sendCommand (MysqlIO.java:1168) на com.mysql.jdbc.MysqlIO.sqlQueryDirect (MysqlIO.java:1279) на com.mysql.jdbc.Connection.execSQL (Connection.java:2281) at com.mysql.jdbc.PreparedStatement.executeQuery (PreparedStatement.java:1634) at hu.craftbox.Server.CraftboxServerHandler.messageReceived (CraftboxServerHandler.java: 158) по адресу org.jboss.netty.channel.SimpleChannelUpstreamHandler. handleUpstream (SimpleChannelUpstreamHandler.java:70) на org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream (DefaultChannelPipeline.java:564) в org.jboss.netty.channel.DefaultChannelPipeline $ DefaultChannelHandlerContext.sendUpstream (DefaultChannelPipeline.java:791) на org.jboss.netty.handler.timeout.ReadTimeoutHandler.messageReceived (ReadTimeoutHandler.java:184) в org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream (SimpleChannelUpstreamHandler.java:70) в org.jboss.netty. channel.DefaultChannelPipeline.sendUpstream (DefaultChannelPipeline.java:564) в org.jboss.netty.channel.DefaultChannelPipeline $ DefaultChannelHandlerContext.sendUpstream (DefaultChannelPipeline.java:791) в org.jboss.netty.channel.Channels.fireMessageReceived (Cha nnels.java:296) на org.jboss.netty.handler.codec.oneone.OneToOneDecoder.handleUpstream (OneToOneDecoder.java:70) на org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream (DefaultChannelPipeline.java:564) на org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream (DefaultChannelPipeline.java:559) на org.jboss.netty.channel.Channels.fireMessageReceived (Channels.java:268) на org.jboss.netty.channel. Channels.fireMessageReceived (Channels.java:255) at org.jboss.netty.channel.socket.nio.NioWorker.read (NioWorker.java:88) at org.jboss.netty.channel.socket.nio.AbstractNioWorker. процесс (AbstractNioWorker.java:108) at org.jboss.netty.channel.socket.nio.AbstractNioSelector.run (AbstractNioSelector.java:318) at org.jboss.netty.channel.socket.nio.AbstractNioWorker.run (AbstractNioWorker.java:89) at org.jboss.netty.channel.socket.nio.NioWorker.run (NioWorker.java:178) at org.jboss.netty.util.ThreadRenamingRunnable.run (ThreadRenamingRunnable.java:108) at org.jboss.netty.util.internal.DeadLockProofWorker $ 1.run (DeadLockProofWorker.java:42) at java.util.concurrent.ThreadPoolExecutor .runWorker (ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor $ Worker.run (ThreadPoolExecutor.java:615) at java.lang.Thread.run (Thread.Java: 744)

** END NESTED ИСКЛЮЧЕНИЕ **

at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:1714) 
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:1930) 
    at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1168) 
    at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1279) 
    at com.mysql.jdbc.Connection.execSQL(Connection.java:2281) 
    at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:1634) 
    at hu.craftbox.Server.CraftboxServerHandler.messageReceived(CraftboxServerHandler.java:158) 
    at org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70) 
    at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564) 
    at org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791) 
    at org.jboss.netty.handler.timeout.ReadTimeoutHandler.messageReceived(ReadTimeoutHandler.java:184) 
    at org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70) 
    at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564) 
    at org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791) 
    at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:296) 
    at org.jboss.netty.handler.codec.oneone.OneToOneDecoder.handleUpstream(OneToOneDecoder.java:70) 
    at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564) 
    at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:559) 
    at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:268) 
    at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:255) 
    at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:88) 
    at org.jboss.netty.channel.socket.nio.AbstractNioWorker.process(AbstractNioWorker.java:108) 
    at org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:318) 
    at org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:89) 
    at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:178) 
    at org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108) 
    at org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) 
    at java.lang.Thread.run(Thread.java:744) 

Что может вызвать эту проблему и как я могу это исправить?

Answer 1

Через некоторое время MySQL сбрасывает неиспользуемые соединения, так как предполагает, что другая сторона забыла закрыть его.

Что вам нужно сделать, так это настроить ваш MySQL правильно, зависит от вашей компании, Проверка here как настроить ваш MySQL.