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本篇文章为大家展示了生产环境数据库连接超时自动回收问题及解决方法，内容简明扼要并且容易理解，绝对能使你眼前一亮，通过这篇文章的详细介绍希望你能有所收获。
最近在前台导入 3000 条记录时，经常发现只导入大概 500 条记录，然后就会报 ERROR TransactionInterceptor – Application exception overridden by rollback exception 的问题。下面记录一下解决过程，以作备忘!
思路
这里主要是由于连接时间过长，失效所致。即，程序获取到的连接已经失效了，而拿一个失效的连接再次请求就会报那样的异常。
1. 查看应用日志
可以看到都是在跟后端数据库连接时断开导致。
具体信息如下：
java.sql.SQLNonTransientConnectionException: No operations allowed after connection closed. at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:110) ~[mysql-connector-java-8.0.13.jar!/:8.0.13] at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:97) ~[mysql-connector-java-8.0.13.jar!/:8.0.13] at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:89) ~[mysql-connector-java-8.0.13.jar!/:8.0.13] at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:63) ~[mysql-connector-java-8.0.13.jar!/:8.0.13] at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:73) ~[mysql-connector-java-8.0.13.jar!/:8.0.13] at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:73) ~[mysql-connector-java-8.0.13.jar!/:8.0.13] at com.mysql.cj.jdbc.ConnectionImpl.rollback(ConnectionImpl.java:1875) ~[mysql-connector-java-8.0.13.jar!/:8.0.13] at com.zaxxer.hikari.pool.ProxyConnection.rollback(ProxyConnection.java:370) ~[HikariCP-3.2.0.jar!/:na] at com.zaxxer.hikari.pool.HikariProxyConnection.rollback(HikariProxyConnection.java) [HikariCP-3.2.0.jar!/:na] at org.springframework.jdbc.datasource.DataSourceTransactionManager.doRollback(DataSourceTransactionManager.java:344) [spring-jdbc-5.1.5.RELEASE.jar!/:5.1.5.RELEASE] at org.springframework.transaction.support.AbstractPlatformTransactionManager.processRollback(AbstractPlatformTransactionManager.java:838) [spring-tx-5.1.5.RELEASE.jar!/:5.1.5.RELEASE] at org.springframework.transaction.support.AbstractPlatformTransactionManager.rollback(AbstractPlatformTransactionManager.java:812) [spring-tx-5.1.5.RELEASE.jar!/:5.1.5.RELEASE] at org.springframework.transaction.support.TransactionTemplate.rollbackOnException(TransactionTemplate.java:168) [spring-tx-5.1.5.RELEASE.jar!/:5.1.5.RELEASE] at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:144) [spring-tx-5.1.5.RELEASE.jar!/:5.1.5.RELEASE] at logwire.web.service.ActionContext$TransactionExecutor.doWithoutResult(ActionContext.java:716) [logwire-web-1.0-SNAPSHOT.jar!/:1.0-SNAPSHOT] at logwire.web.service.ActionContext.doInNewTransactionWithoutResult(ActionContext.java:561) [logwire-web-1.0-SNAPSHOT.jar!/:1.0-SNAPSHOT] at logwire.web.service.task.run.impl.DefaultTaskRunner.doTaskInner(DefaultTaskRunner.java:85) [logwire-web-1.0-SNAPSHOT.jar!/:1.0-SNAPSHOT] at logwire.web.service.task.run.impl.DefaultTaskRunner.doTaskInnerWithMetric(DefaultTaskRunner.java:130) [logwire-web-1.0-SNAPSHOT.jar!/:1.0-SNAPSHOT] at logwire.web.service.task.run.impl.DefaultTaskRunner.doTask(DefaultTaskRunner.java:176) [logwire-web-1.0-SNAPSHOT.jar!/:1.0-SNAPSHOT] at logwire.web.service.task.execute.TaskExecuteService.doTask(TaskExecuteService.java:35) [logwire-web-1.0-SNAPSHOT.jar!/:1.0-SNAPSHOT] at logwire.web.service.task.execute.redisson.impl.RedissonTaskImpl.doTask(RedissonTaskImpl.java:22) [logwire-web-1.0-SNAPSHOT.jar!/:1.0-SNAPSHOT] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_102] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_102] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_102] at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_102] at org.redisson.RedissonRemoteService.invokeMethod(RedissonRemoteService.java:360) [redisson-3.11.3.jar!/:3.11.3] at org.redisson.RedissonRemoteService.lambda$executeMethod$4(RedissonRemoteService.java:329) [redisson-3.11.3.jar!/:3.11.3] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[na:1.8.0_102] at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[na:1.8.0_102] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[na:1.8.0_102] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[na:1.8.0_102] at java.lang.Thread.run(Thread.java:745) ~[na:1.8.0_102] Caused by: com.mysql.cj.exceptions.ConnectionIsClosedException: No operations allowed after connection closed. at sun.reflect.GeneratedConstructorAccessor129.newInstance(Unknown Source) ~[na:na] at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_102] at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[na:1.8.0_102] at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:61) ~[mysql-connector-java-8.0.13.jar!/:8.0.13] at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:105) ~[mysql-connector-java-8.0.13.jar!/:8.0.13] at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:151) ~[mysql-connector-java-8.0.13.jar!/:8.0.13] at com.mysql.cj.NativeSession.checkClosed(NativeSession.java:1259) ~[mysql-connector-java-8.0.13.jar!/:8.0.13] at com.mysql.cj.jdbc.ConnectionImpl.checkClosed(ConnectionImpl.java:575) ~[mysql-connector-java-8.0.13.jar!/:8.0.13] at com.mysql.cj.jdbc.ConnectionImpl.rollback(ConnectionImpl.java:1829) ~[mysql-connector-java-8.0.13.jar!/:8.0.13] ... 25 common frames omitted Caused by: com.mysql.cj.exceptions.CJCommunicationsException: Communications link failure The last packet successfully received from the server was 35,661 milliseconds ago. The last packet sent successfully to the server was 35,662 milliseconds ago. at sun.reflect.GeneratedConstructorAccessor126.newInstance(Unknown Source) ~[na:na] at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_102] at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[na:1.8.0_102] at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:61) ~[mysql-connector-java-8.0.13.jar!/:8.0.13] at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:105) ~[mysql-connector-java-8.0.13.jar!/:8.0.13] at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:151) ~[mysql-connector-java-8.0.13.jar!/:8.0.13] at com.mysql.cj.exceptions.ExceptionFactory.createCommunicationsException(ExceptionFactory.java:167) ~[mysql-connector-java-8.0.13.jar!/:8.0.13] at com.mysql.cj.protocol.a.NativeProtocol.readMessage(NativeProtocol.java:555) ~[mysql-connector-java-8.0.13.jar!/:8.0.13] at com.mysql.cj.protocol.a.NativeProtocol.checkErrorMessage(NativeProtocol.java:725) ~[mysql-connector-java-8.0.13.jar!/:8.0.13] at com.mysql.cj.protocol.a.NativeProtocol.sendCommand(NativeProtocol.java:664) ~[mysql-connector-java-8.0.13.jar!/:8.0.13] at com.mysql.cj.protocol.a.NativeProtocol.sendQueryPacket(NativeProtocol.java:979) ~[mysql-connector-java-8.0.13.jar!/:8.0.13] at com.mysql.cj.NativeSession.execSQL(NativeSession.java:1153) ~[mysql-connector-java-8.0.13.jar!/:8.0.13] at com.mysql.cj.jdbc.ClientPreparedStatement.executeInternal(ClientPreparedStatement.java:951) ~[mysql-connector-java-8.0.13.jar!/:8.0.13] at com.mysql.cj.jdbc.ClientPreparedStatement.executeUpdateInternal(ClientPreparedStatement.java:1113) ~[mysql-connector-java-8.0.13.jar!/:8.0.13] at com.mysql.cj.jdbc.ClientPreparedStatement.executeUpdateInternal(ClientPreparedStatement.java:1061) ~[mysql-connector-java-8.0.13.jar!/:8.0.13] at com.mysql.cj.jdbc.ClientPreparedStatement.executeLargeUpdate(ClientPreparedStatement.java:1381) ~[mysql-connector-java-8.0.13.jar!/:8.0.13] at com.mysql.cj.jdbc.ClientPreparedStatement.executeUpdate(ClientPreparedStatement.java:1046) ~[mysql-connector-java-8.0.13.jar!/:8.0.13] at com.zaxxer.hikari.pool.ProxyPreparedStatement.executeUpdate(ProxyPreparedStatement.java:61) ~[HikariCP-3.2.0.jar!/:na] at com.zaxxer.hikari.pool.HikariProxyPreparedStatement.executeUpdate(HikariProxyPreparedStatement.java) ~[HikariCP-3.2.0.jar!/:na] at org.springframework.jdbc.core.JdbcTemplate.lambda$update$0(JdbcTemplate.java:867) ~[spring-jdbc-5.1.5.RELEASE.jar!/:5.1.5.RELEASE] at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:617) ~[spring-jdbc-5.1.5.RELEASE.jar!/:5.1.5.RELEASE] at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:862) ~[spring-jdbc-5.1.5.RELEASE.jar!/:5.1.5.RELEASE] at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:917) ~[spring-jdbc-5.1.5.RELEASE.jar!/:5.1.5.RELEASE] at logwire.web.service.query.sql.QueryDataSetManager.insertModelRow(QueryDataSetManager.java:419) ~[logwire-web-1.0-SNAPSHOT.jar!/:1.0-SNAPSHOT] at logwire.web.service.query.sql.QueryDataSetManager.saveModelDataSet(QueryDataSetManager.java:140) ~[logwire-web-1.0-SNAPSHOT.jar!/:1.0-SNAPSHOT] at logwire.web.service.query.sql.QueryDataSetManager.saveModelDataSet(QueryDataSetManager.java:104) ~[logwire-web-1.0-SNAPSHOT.jar!/:1.0-SNAPSHOT] at logwire.web.service.query.sql.QueryDataSetManager.insert(QueryDataSetManager.java:272) ~[logwire-web-1.0-SNAPSHOT.jar!/:1.0-SNAPSHOT] at logwire.web.service.query.QueryService.insert(QueryService.java:183) ~[logwire-web-1.0-SNAPSHOT.jar!/:1.0-SNAPSHOT] at logwire.web.service.query.QueryService.insert(QueryService.java:163) ~[logwire-web-1.0-SNAPSHOT.jar!/:1.0-SNAPSHOT] at jdk.nashorn.internal.scripts.Script$Recompilation$203$16161AAAAAAA$importHandlers.L:1$insertLog(config/custom_js/importHandlers.js:449) ~[na:na] at jdk.nashorn.internal.scripts.Script$Recompilation$198$9472A$tasks.L:1$handleImport$L:256(config/custom_js/tasks.js:273) ~[na:na] at jdk.nashorn.javaadapters.java.util.function.Consumer.accept(Unknown Source) ~[na:na] at java.util.ArrayList.forEach(ArrayList.java:1249) ~[na:1.8.0_102] at jdk.nashorn.internal.scripts.Script$Recompilation$196$9015AAA$tasks.L:1$handleImport(config/custom_js/tasks.js:256) ~[na:na] at jdk.nashorn.internal.scripts.Script$Recompilation$195$8841AAA$tasks.L:1$partsImportDD(config/custom_js/tasks.js:239) ~[na:na] at jdk.nashorn.internal.runtime.ScriptFunctionData.invoke(ScriptFunctionData.java:643) ~[nashorn.jar:na] at jdk.nashorn.internal.runtime.ScriptFunction.invoke(ScriptFunction.java:494) ~[nashorn.jar:na] at jdk.nashorn.internal.runtime.ScriptRuntime.apply(ScriptRuntime.java:393) ~[nashorn.jar:na] at jdk.nashorn.api.scripting.ScriptObjectMirror.callMember(ScriptObjectMirror.java:199) ~[nashorn.jar:na] at logwire.core.meta.task.ScriptTask.doTask(ScriptTask.java:24) ~[logwire-web-1.0-SNAPSHOT.jar!/:1.0-SNAPSHOT] at logwire.web.service.task.run.impl.DefaultTaskRunner$1.doInTransactionWithoutResult(DefaultTaskRunner.java:88) ~[logwire-web-1.0-SNAPSHOT.jar!/:1.0-SNAPSHOT] at org.springframework.transaction.support.TransactionCallbackWithoutResult.doInTransaction(TransactionCallbackWithoutResult.java:36) ~[spring-tx-5.1.5.RELEASE.jar!/:5.1.5.RELEASE] at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:140) [spring-tx-5.1.5.RELEASE.jar!/:5.1.5.RELEASE] ... 18 common frames omitted Caused by: java.io.EOFException: Can not read response from server. Expected to read 4 bytes, read 0 bytes before connection was unexpectedly lost. at com.mysql.cj.protocol.FullReadInputStream.readFully(FullReadInputStream.java:67) ~[mysql-connector-java-8.0.13.jar!/:8.0.13] at com.mysql.cj.protocol.a.SimplePacketReader.readHeader(SimplePacketReader.java:63) ~[mysql-connector-java-8.0.13.jar!/:8.0.13] at com.mysql.cj.protocol.a.SimplePacketReader.readHeader(SimplePacketReader.java:45) ~[mysql-connector-java-8.0.13.jar!/:8.0.13] at com.mysql.cj.protocol.a.TimeTrackingPacketReader.readHeader(TimeTrackingPacketReader.java:52) ~[mysql-connector-java-8.0.13.jar!/:8.0.13] at com.mysql.cj.protocol.a.TimeTrackingPacketReader.readHeader(TimeTrackingPacketReader.java:41) ~[mysql-connector-java-8.0.13.jar!/:8.0.13] at com.mysql.cj.protocol.a.MultiPacketReader.readHeader(MultiPacketReader.java:54) ~[mysql-connector-java-8.0.13.jar!/:8.0.13] at com.mysql.cj.protocol.a.MultiPacketReader.readHeader(MultiPacketReader.java:44) ~[mysql-connector-java-8.0.13.jar!/:8.0.13] at com.mysql.cj.protocol.a.NativeProtocol.readMessage(NativeProtocol.java:549) ~[mysql-connector-java-8.0.13.jar!/:8.0.13] ... 53 common frames omitted2. 直连 mysql 测试
由于后端数据库是用 mycat+mysql 主从做的读写分离，影响因素比较多，所以需先去掉影响的一些因素，这里先直连 mysql 数据库测试，绕过 mycat。
经过业务测试发现可以导入成功，这样问题就在 mycat 上了。
3. mycat 关闭读写分离
关闭 mycat 的读写分离后导入 3000 条可以导入 2700 条，但还有部分失败。
mycat 日志如下：
INFO [$_NIOREACTOR-1-RW] (io.mycat.net.AbstractConnection.close(AbstractConnection.java:520)) - close connection,reason:stream closed ,ServerConnection [id=55, schema=tms_prod, host=, u ser=root,txIsolation=3, autocommit=true, schema=tms_prod, executeSql=null] INFO [$_NIOREACTOR-2-RW] (io.mycat.net.AbstractConnection.close(AbstractConnection.java:520)) - close connection,reason:stream closed ,ServerConnection [id=56, schema=tms_prod, host=, u4、. 改应用配置
经过查找资料和分析，得出该问题主要是由于连接时间过长，失效所致，既然程序获取的连接已经失效了，那么对于失效的连接就不应该使用，而应该再次获取有效的连接。增加配置如下：
spring.datasource.validation-query=SELECT 1修改后让业务重新测试，导入正常，问题解决。
总结
当数据库连接池中的连接被创建而长时间不使用的情况下，该连接会自动回收并失效，但客户端并不知道，在进行数据库操作时仍然使用的是无效的数据库连接，这样，就导致客户端程序报“ java.sql.SQLException: Io 异常: Connection reset by peer”或“java.sql.SQLException 关闭的连接”异常，加上 spring.datasource.validation-query=SELECT 1 配置后，客户端在使用一个无效的连接时会先对该连接进行测试，如果发现该连接已经无效，则重新从连接池获取有效数据库连接来使用。
上述内容就是生产环境数据库连接超时自动回收问题及解决方法，你们学到知识或技能了吗？如果还想学到更多技能或者丰富自己的知识储备，欢迎关注丸趣 TV 行业资讯频道。
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