最近，我們有幾個系統頻繁的出現org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection異常，特整理總結如下。
通常會伴隨兩類錯誤，第一類為：
INFO | jvm 1 | 2017/03/20 18:17:44 | ### The error occurred while executing a query
INFO | jvm 1 | 2017/03/20 18:17:44 | ### Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is java.sql.SQLException: Cannot get a connection
, pool error Timeout waiting for idle object
INFO | jvm 1 | 2017/03/20 18:17:44 | at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:26)
INFO | jvm 1 | 2017/03/20 18:17:44 | at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:111)
INFO | jvm 1 | 2017/03/20 18:17:44 | at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:102)
INFO | jvm 1 | 2017/03/20 18:17:44 | at sun.reflect.GeneratedMethodAccessor7.invoke(Unknown Source)
INFO | jvm 1 | 2017/03/20 18:17:44 | at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
INFO | jvm 1 | 2017/03/20 18:17:44 | at java.lang.reflect.Method.invoke(Method.java:497)
INFO | jvm 1 | 2017/03/20 18:17:44 | at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:358)
INFO | jvm 1 | 2017/03/20 18:17:44 | ... 18 more
INFO | jvm 1 | 2017/03/20 18:17:44 | Caused by: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is java.sql.SQLException: Cannot get a connection
, pool error Timeout waiting for idle object
INFO | jvm 1 | 2017/03/20 18:17:44 | at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:80)
INFO | jvm 1 | 2017/03/20 18:17:44 | at org.mybatis.spring.transaction.SpringManagedTransaction.openConnection(SpringManagedTransaction.java:81)
INFO | jvm 1 | 2017/03/20 18:17:44 | at org.mybatis.spring.transaction.SpringManagedTransaction.getConnection(SpringManagedTransaction.java:67)
INFO | jvm 1 | 2017/03/20 18:17:44 | at org.apache.ibatis.executor.BaseExecutor.getConnection(BaseExecutor.java:279)
INFO | jvm 1 | 2017/03/20 18:17:44 | at org.apache.ibatis.executor.SimpleExecutor.prepareStatement(SimpleExecutor.java:72)
INFO | jvm 1 | 2017/03/20 18:17:44 | at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:59)
INFO | jvm 1 | 2017/03/20 18:17:44 | at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:267)
INFO | jvm 1 | 2017/03/20 18:17:44 | at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:137)
INFO | jvm 1 | 2017/03/20 18:17:44 | at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:96)
INFO | jvm 1 | 2017/03/20 18:17:44 | at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:77)
INFO | jvm 1 | 2017/03/20 18:17:44 | at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:108)
INFO | jvm 1 | 2017/03/20 18:17:44 | ... 23 more
INFO | jvm 1 | 2017/03/20 18:17:44 | Caused by: java.sql.SQLException: Cannot get a connection, pool error Timeout waiting for idle object
INFO | jvm 1 | 2017/03/20 18:17:44 | at org.apache.commons.dbcp2.PoolingDataSource.getConnection(PoolingDataSource.java:142)
INFO | jvm 1 | 2017/03/20 18:17:44 | at org.apache.commons.dbcp2.BasicDataSource.getConnection(BasicDataSource.java:1533)
INFO | jvm 1 | 2017/03/20 18:17:44 | at org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection(DataSourceUtils.java:111)
INFO | jvm 1 | 2017/03/20 18:17:44 | at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:77)
INFO | jvm 1 | 2017/03/20 18:17:44 | ... 33 more
INFO | jvm 1 | 2017/03/20 18:17:44 | Caused by: java.util.NoSuchElementException: Timeout waiting for idle object
INFO | jvm 1 | 2017/03/20 18:17:44 | at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:449)
INFO | jvm 1 | 2017/03/20 18:17:44 | at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:363)
INFO | jvm 1 | 2017/03/20 18:17:44 | at org.apache.commons.dbcp2.PoolingDataSource.getConnection(PoolingDataSource.java:134)
INFO | jvm 1 | 2017/03/20 18:17:44 | ... 36 more
對應c3p0為：
Caused by: java.sql.SQLException: An attempt by a client to checkout a Connection has timed out.
at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:106)
at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:65)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:527)
at com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getConnection(AbstractPoolBackedDataSource.java:128)
at org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection(DataSourceUtils.java:111)
at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:77)
這通常要么連接有泄漏，沒有及時釋放；要么連接配置確實過低；要么SQL性能差，每次占用時間長。
==========================另外一類：
INFO | jvm 1 | 2017/03/20 17:29:06 | Caused by: org.apache.ibatis.exceptions.PersistenceException:
INFO | jvm 1 | 2017/03/20 17:29:06 | ### Error querying database. Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is com.mysql.jdbc.excep
tions.jdbc4.CommunicationsException: Communications link failure
INFO | jvm 1 | 2017/03/20 17:29:06 |
INFO | jvm 1 | 2017/03/20 17:29:06 | The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
INFO | jvm 1 | 2017/03/20 17:29:06 | ### The error may exist in URL [jar:file:/usr/local/src/osm-all/services/osm-secuact-service-impl-1.5.31.0315-RELEASE.jar!/com/ld/net/secuact/mapper/SecuritiesAccountM
apper.xml]
INFO | jvm 1 | 2017/03/20 17:29:06 | ### The error may involve com.ld.net.secuact.dao.ISecuritiesAccountDao.funcl_QueryUniteQuitiesPosition
INFO | jvm 1 | 2017/03/20 17:29:06 | ### The error occurred while executing a query
INFO | jvm 1 | 2017/03/20 17:29:06 | ### Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is com.mysql.jdbc.exceptions.jdbc4.Communications
Exception: Communications link failure
INFO | jvm 1 | 2017/03/20 17:29:06 |
INFO | jvm 1 | 2017/03/20 17:29:06 | The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
INFO | jvm 1 | 2017/03/20 17:29:06 | at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:26)
INFO | jvm 1 | 2017/03/20 17:29:06 | at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:111)
INFO | jvm 1 | 2017/03/20 17:29:06 | at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:102)
INFO | jvm 1 | 2017/03/20 17:29:06 | at sun.reflect.GeneratedMethodAccessor30.invoke(Unknown Source)
INFO | jvm 1 | 2017/03/20 17:29:06 | at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
INFO | jvm 1 | 2017/03/20 17:29:06 | at java.lang.reflect.Method.invoke(Method.java:498)
INFO | jvm 1 | 2017/03/20 17:29:06 | at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:358)
INFO | jvm 1 | 2017/03/20 17:29:06 | ... 18 more
INFO | jvm 1 | 2017/03/20 17:29:06 | Caused by: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is com.mysql.jdbc.exceptions.jdbc4.Communications
Exception: Communications link failure
INFO | jvm 1 | 2017/03/20 17:29:06 |
INFO | jvm 1 | 2017/03/20 17:29:06 | The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
INFO | jvm 1 | 2017/03/20 17:29:06 | at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:80)
INFO | jvm 1 | 2017/03/20 17:29:06 | at org.mybatis.spring.transaction.SpringManagedTransaction.openConnection(SpringManagedTransaction.java:81)
INFO | jvm 1 | 2017/03/20 17:29:06 | at org.mybatis.spring.transaction.SpringManagedTransaction.getConnection(SpringManagedTransaction.java:67)
INFO | jvm 1 | 2017/03/20 17:29:06 | at org.apache.ibatis.executor.BaseExecutor.getConnection(BaseExecutor.java:279)
INFO | jvm 1 | 2017/03/20 17:29:06 | at org.apache.ibatis.executor.SimpleExecutor.prepareStatement(SimpleExecutor.java:72)
INFO | jvm 1 | 2017/03/20 17:29:06 | at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:59)
INFO | jvm 1 | 2017/03/20 17:29:06 | at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:267)
INFO | jvm 1 | 2017/03/20 17:29:06 | at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:137)
INFO | jvm 1 | 2017/03/20 17:29:06 | at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:96)
INFO | jvm 1 | 2017/03/20 17:29:06 | at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:77)
INFO | jvm 1 | 2017/03/20 17:29:06 | at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:108)
INFO | jvm 1 | 2017/03/20 17:29:06 | ... 23 more
INFO | jvm 1 | 2017/03/20 17:29:06 | Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
INFO | jvm 1 | 2017/03/20 17:29:06 |
通常來說，Communications link failure會有兩種額外的補充上下文信息，如下：
INFO | jvm 1 | 2017/03/20 17:29:06 | The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
The last packet successfully received from the server was 1,583 milliseconds ago. The last packet sent successfully to the server was 1,583 milliseconds ago.
這兩錯誤信息可以說是通過com.mysql.jdbc.SQLError.createLinkFailureMessageBasedOnHeuristics拋出的：
public static String createLinkFailureMessageBasedOnHeuristics(MySQLConnection conn, long lastPacketSentTimeMs, long lastPacketReceivedTimeMs, Exception underlyingException) { long serverTimeoutSeconds = 0; boolean isInteractiveClient = false; if (conn != null) { isInteractiveClient = conn.getInteractiveClient(); String serverTimeoutSecondsStr = null; if (isInteractiveClient) { serverTimeoutSecondsStr = conn.getServerVariable("interactive_timeout"); } else { serverTimeoutSecondsStr = conn.getServerVariable("wait_timeout"); } if (serverTimeoutSecondsStr != null) { try { serverTimeoutSeconds = Long.parseLong(serverTimeoutSecondsStr); } catch (NumberFormatException nfe) { serverTimeoutSeconds = 0; } } } StringBuilder exceptionMessageBuf = new StringBuilder(); long nowMs = System.currentTimeMillis(); if (lastPacketSentTimeMs == 0) { lastPacketSentTimeMs = nowMs; } long timeSinceLastPacketSentMs = (nowMs - lastPacketSentTimeMs); long timeSinceLastPacketSeconds = timeSinceLastPacketSentMs / 1000; long timeSinceLastPacketReceivedMs = (nowMs - lastPacketReceivedTimeMs); int dueToTimeout = DUE_TO_TIMEOUT_FALSE; StringBuilder timeoutMessageBuf = null; if (serverTimeoutSeconds != 0) { if (timeSinceLastPacketSeconds > serverTimeoutSeconds) { dueToTimeout = DUE_TO_TIMEOUT_TRUE; timeoutMessageBuf = new StringBuilder(); timeoutMessageBuf.append(Messages.getString("CommunicationsException.2")); if (!isInteractiveClient) { timeoutMessageBuf.append(Messages.getString("CommunicationsException.3")); } else { timeoutMessageBuf.append(Messages.getString("CommunicationsException.4")); } } } else if (timeSinceLastPacketSeconds > DEFAULT_WAIT_TIMEOUT_SECONDS) { dueToTimeout = DUE_TO_TIMEOUT_MAYBE; timeoutMessageBuf = new StringBuilder(); timeoutMessageBuf.append(Messages.getString("CommunicationsException.5")); timeoutMessageBuf.append(Messages.getString("CommunicationsException.6")); timeoutMessageBuf.append(Messages.getString("CommunicationsException.7")); timeoutMessageBuf.append(Messages.getString("CommunicationsException.8")); } if (dueToTimeout == DUE_TO_TIMEOUT_TRUE || dueToTimeout == DUE_TO_TIMEOUT_MAYBE) { if (lastPacketReceivedTimeMs != 0) { Object[] timingInfo = { Long.valueOf(timeSinceLastPacketReceivedMs), Long.valueOf(timeSinceLastPacketSentMs) }; exceptionMessageBuf.append(Messages.getString("CommunicationsException.ServerPacketTimingInfo", timingInfo)); } else { exceptionMessageBuf.append( Messages.getString("CommunicationsException.ServerPacketTimingInfoNoRecv", new Object[] { Long.valueOf(timeSinceLastPacketSentMs) })); } if (timeoutMessageBuf != null) { exceptionMessageBuf.append(timeoutMessageBuf); } exceptionMessageBuf.append(Messages.getString("CommunicationsException.11")); exceptionMessageBuf.append(Messages.getString("CommunicationsException.12")); exceptionMessageBuf.append(Messages.getString("CommunicationsException.13")); } else { // // Attempt to determine the reason for the underlying exception (we can only make a best-guess here) // if (underlyingException instanceof BindException) { if (conn.getLocalSocketAddress() != null && !Util.interfaceExists(conn.getLocalSocketAddress())) { exceptionMessageBuf.append(Messages.getString("CommunicationsException.LocalSocketAddressNotAvailable")); } else { // too many client connections??? exceptionMessageBuf.append(Messages.getString("CommunicationsException.TooManyClientConnections")); } } } if (exceptionMessageBuf.length() == 0) { // We haven't figured out a good reason, so copy it. exceptionMessageBuf.append(Messages.getString("CommunicationsException.20")); if (conn != null && conn.getMaintainTimeStats() && !conn.getParanoid()) { //可知, 都是從這里拋出來的, 不是因為server參數wait_timeout的原因, 而且我們使用的是默認值28800 exceptionMessageBuf.append("\n\n"); if (lastPacketReceivedTimeMs != 0) { Object[] timingInfo = { Long.valueOf(timeSinceLastPacketReceivedMs), Long.valueOf(timeSinceLastPacketSentMs) }; exceptionMessageBuf.append(Messages.getString("CommunicationsException.ServerPacketTimingInfo", timingInfo)); } else { exceptionMessageBuf.append(Messages.getString("CommunicationsException.ServerPacketTimingInfoNoRecv", new Object[] { Long.valueOf(timeSinceLastPacketSentMs) })); } } } return exceptionMessageBuf.toString(); }
對於該異常，又有三種情況：
1、沒有伴隨其他異常。這一種通常是比較難解釋或者目前網上為止還沒有特別詳解或者解釋沒有說服力的（比如由於數據庫回收了連接，而系統的連接池不知道，繼續使用被回收的連接所致的，我們測試系統重啟不到2小時出現了該問題、同時dbcp連接也增加了validationQuery等驗證；有說升級到5.1.38后的，我們是使用的是5.1.39；有說防火牆的，我們沒開防火牆）。
2、伴隨着ConnectException；對於ConnectException，又分為Connection refused和Connection reset。Connection refused通常是網絡不通、或者庫shutdown了，也可能starting。Connection reset通常是庫正在shutdown，也可能starting。
3、伴隨着java.io.EOFException。這一種，不用特別解釋。
INFO | jvm 1 | 2017/03/20 17:29:06 | at sun.reflect.GeneratedConstructorAccessor106.newInstance(Unknown Source)
INFO | jvm 1 | 2017/03/20 17:29:06 | at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
INFO | jvm 1 | 2017/03/20 17:29:06 | at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
INFO | jvm 1 | 2017/03/20 17:29:06 | at com.mysql.jdbc.Util.handleNewInstance(Util.java:404)
INFO | jvm 1 | 2017/03/20 17:29:06 | at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:988)
INFO | jvm 1 | 2017/03/20 17:29:06 | at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:341)
INFO | jvm 1 | 2017/03/20 17:29:06 | at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2251)
INFO | jvm 1 | 2017/03/20 17:29:06 | at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2284)
INFO | jvm 1 | 2017/03/20 17:29:06 | at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2083)
INFO | jvm 1 | 2017/03/20 17:29:06 | at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:806)
INFO | jvm 1 | 2017/03/20 17:29:06 | at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
INFO | jvm 1 | 2017/03/20 17:29:06 | at sun.reflect.GeneratedConstructorAccessor25.newInstance(Unknown Source)
INFO | jvm 1 | 2017/03/20 17:29:06 | at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
INFO | jvm 1 | 2017/03/20 17:29:06 | at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
INFO | jvm 1 | 2017/03/20 17:29:06 | at com.mysql.jdbc.Util.handleNewInstance(Util.java:404)
INFO | jvm 1 | 2017/03/20 17:29:06 | at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:410)
INFO | jvm 1 | 2017/03/20 17:29:06 | at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:328)
INFO | jvm 1 | 2017/03/20 17:29:06 | at org.apache.commons.dbcp2.DriverConnectionFactory.createConnection(DriverConnectionFactory.java:39)
INFO | jvm 1 | 2017/03/20 17:29:06 | at org.apache.commons.dbcp2.PoolableConnectionFactory.makeObject(PoolableConnectionFactory.java:256)
INFO | jvm 1 | 2017/03/20 17:29:06 | at org.apache.commons.pool2.impl.GenericObjectPool.create(GenericObjectPool.java:868)
INFO | jvm 1 | 2017/03/20 17:29:06 | at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:435)
INFO | jvm 1 | 2017/03/20 17:29:06 | at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:363)
INFO | jvm 1 | 2017/03/20 17:29:06 | at org.apache.commons.dbcp2.PoolingDataSource.getConnection(PoolingDataSource.java:134)
INFO | jvm 1 | 2017/03/20 17:29:06 | at org.apache.commons.dbcp2.BasicDataSource.getConnection(BasicDataSource.java:1533)
INFO | jvm 1 | 2017/03/20 17:29:06 | at org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection(DataSourceUtils.java:111)
INFO | jvm 1 | 2017/03/20 17:29:06 | at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:77)
INFO | jvm 1 | 2017/03/20 17:29:06 | ... 33 more
INFO | jvm 1 | 2017/03/20 17:29:06 | Caused by: java.net.ConnectException: Connection refused
INFO | jvm 1 | 2017/03/20 17:29:06 | at java.net.PlainSocketImpl.socketConnect(Native Method)
INFO | jvm 1 | 2017/03/20 17:29:06 | at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
INFO | jvm 1 | 2017/03/20 17:29:06 | at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
INFO | jvm 1 | 2017/03/20 17:29:06 | at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
INFO | jvm 1 | 2017/03/20 17:29:06 | at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
INFO | jvm 1 | 2017/03/20 17:29:06 | at java.net.Socket.connect(Socket.java:589)
INFO | jvm 1 | 2017/03/20 17:29:06 | at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:211)
INFO | jvm 1 | 2017/03/20 17:29:06 | at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:300)
INFO | jvm 1 | 2017/03/20 17:29:06 | ... 53 more
或者：
Caused by: java.io.EOFException: Can not read response from server. Expected to read 4 bytes, read 0 bytes before connection was unexpectedly lost.
at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:3004)
at com.mysql.jdbc.MysqlIO.readPacket(MysqlIO.java:567)
... 54 more
Caused by: java.net.SocketException: Connection reset
at java.net.SocketInputStream.read(SocketInputStream.java:209)
at java.net.SocketInputStream.read(SocketInputStream.java:141)
at com.mysql.jdbc.util.ReadAheadInputStream.fill(ReadAheadInputStream.java:101)
at com.mysql.jdbc.util.ReadAheadInputStream.readFromUnderlyingStreamIfNecessary(ReadAheadInputStream.java:144)
at com.mysql.jdbc.util.ReadAheadInputStream.read(ReadAheadInputStream.java:174)
at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:3001)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3462)
... 59 more