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我有一個應用程序設置爲與BoneCP彙集mysql連接。目前,該應用程序沒有得到很好的使用,所以連接不經常使用。一定時間後,曾經工作過的查詢,啓動失敗,我也得到類似這樣的消息:Java BoneCP MySQL連接超時
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet successfully received from the server was 2,618,063 milliseconds ago. The last packet sent successfully to the server was 44,734 milliseconds 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:411)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1117)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3567)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3456)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3997)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2468)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2629)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2719)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2155)
at com.mysql.jdbc.PreparedStatement.execute(PreparedStatement.java:1379)
at com.jolbox.bonecp.PreparedStatementHandle.execute(PreparedStatementHandle.java:138)
我設立BoneCP這樣的:
BoneCPConfig config = new BoneCPConfig();
config.setJdbcUrl("jdbc:mysql://" + hostname + "/" + database);
config.setUsername(username);
config.setPassword(password);
config.setMinConnectionsPerPartition(minPoolSize);
config.setMaxConnectionsPerPartition(maxPoolSize);
config.setIdleConnectionTestPeriodInMinutes(60);
config.setIdleMaxAgeInMinutes(240);
config.setPartitionCount(1);
connectionPool = new BoneCP(config);
我不確定如何找出mysql服務器的超時時間(它並未從默認設置改變),但是在大約5或10分鐘沒有連接池活動後,我看到這個錯誤,這看起來非常短。
感謝您的備存─ alive語句部分,以及Mysql空閒超時的變量名稱。我檢查了他們兩人,他們都默認爲8小時。現在在我一直在做的測試中,程序只運行了最多30分鐘到一小時。我會嘗試保持活力的聲明,並讓你知道! – Nick 2012-08-14 05:57:58
這似乎解決了問題!謝謝! – Nick 2012-08-14 20:18:16