[2019-08-27 20:47:08,332] [:] (JdbcTransaction.java:138) DEBUG org.apache.ibatis.transaction.jdbc.JdbcTransaction - Opening JDBC Connection
org.apache.ibatis.exceptions.PersistenceException:
### Error updating database. Cause: org.apache.ibatis.executor.ExecutorException: Error selecting key or setting result to parameter object. Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server. Attempted reconnect 10 times. Giving up.
### The error may exist in com/test/receive/mapper/LogPackageRcvDataconsMapper.xml
### The error may involve com.test.receive.mapper.LogPackageRcvDataconsMapper.insertLogPackageRcvDataconsistency!selectKey
### The error occurred while executing a query
### Cause: org.apache.ibatis.executor.ExecutorException: Error selecting key or setting result to parameter object. Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server. Attempted reconnect 10 times. Giving up.
at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)
at org.apache.ibatis.session.defaults.DefaultSqlSession.update(DefaultSqlSession.java:172)
at org.apache.ibatis.session.defaults.DefaultSqlSession.insert(DefaultSqlSession.java:157)
at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:52)
at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:53)
at com.sun.proxy.$Proxy8.insertLogPackageRcvDataconsistency(Unknown Source)
at com.test.receive.dao.LogPackageRcvDataconsDao.insertLogPackageRcvDataconsistency(LogPackageRcvDataconsDao.java:28)
at com.test.receive.service.LogPackageRcvDataconsService.insertLogPackageRcvDataconsistency(LogPackageRcvDataconsService.java:12)
at com.asiainfo.receive.servlet.RcvRequestServlet.insertLogPkgRcvDatacons(RcvRequestServlet.java:468)
at com.asiainfo.receive.servlet.RcvRequestServlet.doPost(RcvRequestServlet.java:61)
at com.asiainfo.receive.servlet.RcvRequestServlet.doGet(RcvRequestServlet.java:51)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:94)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:492)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:80)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:620)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:502)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1152)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:684)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1539)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1495)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
Caused by: org.apache.ibatis.executor.ExecutorException: Error selecting key or setting result to parameter object. Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server. Attempted reconnect 10 times. Giving up.
at org.apache.ibatis.executor.keygen.SelectKeyGenerator.processGeneratedKeys(SelectKeyGenerator.java:92)
at org.apache.ibatis.executor.keygen.SelectKeyGenerator.processBefore(SelectKeyGenerator.java:47)
at org.apache.ibatis.executor.statement.BaseStatementHandler.generateKeys(BaseStatementHandler.java:138)
at org.apache.ibatis.executor.statement.BaseStatementHandler.<init>(BaseStatementHandler.java:63)
at org.apache.ibatis.executor.statement.PreparedStatementHandler.<init>(PreparedStatementHandler.java:39)
at org.apache.ibatis.executor.statement.RoutingStatementHandler.<init>(RoutingStatementHandler.java:45)
at org.apache.ibatis.session.Configuration.newStatementHandler(Configuration.java:488)
at org.apache.ibatis.executor.SimpleExecutor.doUpdate(SimpleExecutor.java:47)
at org.apache.ibatis.executor.BaseExecutor.update(BaseExecutor.java:115)
at org.apache.ibatis.executor.CachingExecutor.update(CachingExecutor.java:75)
at org.apache.ibatis.session.defaults.DefaultSqlSession.update(DefaultSqlSession.java:170)
... 32 more
Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
at sun.reflect.GeneratedConstructorAccessor10.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:408)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1137)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:355)
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2490)
at com.mysql.jdbc.ConnectionImpl.connectWithRetries(ConnectionImpl.java:2332)
... 68 more
Caused by: java.net.ConnectException: Connection timed out (Connection timed out)
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at java.net.Socket.connect(Socket.java:538)
at java.net.Socket.<init>(Socket.java:434)
at java.net.Socket.<init>(Socket.java:244)
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:258)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:305)
... 70 more
java.lang.NullPointerException
at com.test.receive.utils.pswd.DbIntervalUtil.run(DbIntervalUtil.java:36)
at java.util.TimerThread.mainLoop(Timer.java:555)
at java.util.TimerThread.run(Timer.java:505)
中间删除了一些重复的内容
查询了数据库的时间：
86400秒是24小时，不是这个问题
重启tomcat后，当时没有问题，第二天又看了一下，又是同样的错误
旁边的同事看了一下我的数据库连接，发现我连的是测试环境的数据库，换成生产的数据库登了10分钟后都没有报这个错，
日志输出了每十分钟成功连接数据库，之前都是每十分钟连接数据库失败。
之所以连错数据库具体我也记不清了，但是我第一次部署时修改了数据库配置，可能后面替换了war包后，我只记得第一次修改了，再替换后就忘记修改了，我的数据库的配置文件在项目发布后是在WEB-INF/classes下的properties文件中。
如果有类似的错误，可以按照下面的步骤
1、查看数据库连接对不对
2、查看数据库的超时时间
3、一步一步看代码
