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我有一个应用程序设置为与BoneCP汇集mysql连接。目前,该应用程序没有得到很好的使用,所以连接不经常使用。一定时间后,曾经工作过的查询,启动失败,我也得到类似这样的消息:Java BoneCP MySQL连接超时
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)
我设立BoneCP这样的:
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);
我不确定如何找出mysql服务器的超时时间(它并未从默认设置改变),但是在大约5或10分钟没有连接池活动后,我看到这个错误,这看起来非常短。
感谢您的备存─ alive语句部分,以及Mysql空闲超时的变量名称。我检查了他们两人,他们都默认为8小时。现在在我一直在做的测试中,程序只运行了最多30分钟到一小时。我会尝试保持活力的声明,并让你知道! – Nick 2012-08-14 05:57:58
这似乎解决了问题!谢谢! – Nick 2012-08-14 20:18:16