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本篇文章為大家展示了生產環境數據庫連接超時自動回收問題及解決方法，內容簡明扼要并且容易理解，絕對能使你眼前一亮，通過這篇文章的詳細介紹希望你能有所收獲。
最近在前臺導入 3000 條記錄時，經常發現只導入大概 500 條記錄，然后就會報 ERROR TransactionInterceptor – Application exception overridden by rollback exception 的問題。下面記錄一下解決過程，以作備忘!
思路
這里主要是由于連接時間過長，失效所致。即，程序獲取到的連接已經失效了，而拿一個失效的連接再次請求就會報那樣的異常。
1. 查看應用日志
可以看到都是在跟后端數據庫連接時斷開導致。
具體信息如下：
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$1.doInTransactionWithoutResult(DefaultTaskRunner.java:88) ~[logwire-web-1.0-SNAPSHOT.jar!/:1.0-SNAPSHOT] at org.springframework.transaction.support.TransactionCallbackWithoutResult.doInTransaction(TransactionCallbackWithoutResult.java:36) ~[spring-tx-5.1.5.RELEASE.jar!/:5.1.5.RELEASE] at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:140) [spring-tx-5.1.5.RELEASE.jar!/:5.1.5.RELEASE] ... 18 common frames omitted Caused by: java.io.EOFException: Can not read response from server. Expected to read 4 bytes, read 0 bytes before connection was unexpectedly lost. at com.mysql.cj.protocol.FullReadInputStream.readFully(FullReadInputStream.java:67) ~[mysql-connector-java-8.0.13.jar!/:8.0.13] at com.mysql.cj.protocol.a.SimplePacketReader.readHeader(SimplePacketReader.java:63) ~[mysql-connector-java-8.0.13.jar!/:8.0.13] at com.mysql.cj.protocol.a.SimplePacketReader.readHeader(SimplePacketReader.java:45) ~[mysql-connector-java-8.0.13.jar!/:8.0.13] at com.mysql.cj.protocol.a.TimeTrackingPacketReader.readHeader(TimeTrackingPacketReader.java:52) ~[mysql-connector-java-8.0.13.jar!/:8.0.13] at com.mysql.cj.protocol.a.TimeTrackingPacketReader.readHeader(TimeTrackingPacketReader.java:41) ~[mysql-connector-java-8.0.13.jar!/:8.0.13] at com.mysql.cj.protocol.a.MultiPacketReader.readHeader(MultiPacketReader.java:54) ~[mysql-connector-java-8.0.13.jar!/:8.0.13] at com.mysql.cj.protocol.a.MultiPacketReader.readHeader(MultiPacketReader.java:44) ~[mysql-connector-java-8.0.13.jar!/:8.0.13] at com.mysql.cj.protocol.a.NativeProtocol.readMessage(NativeProtocol.java:549) ~[mysql-connector-java-8.0.13.jar!/:8.0.13] ... 53 common frames omitted2. 直連 mysql 測試
由于后端數據庫是用 mycat+mysql 主從做的讀寫分離，影響因素比較多，所以需先去掉影響的一些因素，這里先直連 mysql 數據庫測試，繞過 mycat。
經過業務測試發現可以導入成功，這樣問題就在 mycat 上了。
3. mycat 關閉讀寫分離
關閉 mycat 的讀寫分離后導入 3000 條可以導入 2700 條，但還有部分失敗。
mycat 日志如下：
INFO [$_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、. 改應用配置
經過查找資料和分析，得出該問題主要是由于連接時間過長，失效所致，既然程序獲取的連接已經失效了，那么對于失效的連接就不應該使用，而應該再次獲取有效的連接。增加配置如下：
spring.datasource.validation-query=SELECT 1修改后讓業務重新測試，導入正常，問題解決。
總結
當數據庫連接池中的連接被創建而長時間不使用的情況下，該連接會自動回收并失效，但客戶端并不知道，在進行數據庫操作時仍然使用的是無效的數據庫連接，這樣，就導致客戶端程序報“ java.sql.SQLException: Io 異常: Connection reset by peer”或“java.sql.SQLException 關閉的連接”異常，加上 spring.datasource.validation-query=SELECT 1 配置后，客戶端在使用一個無效的連接時會先對該連接進行測試，如果發現該連接已經無效，則重新從連接池獲取有效數據庫連接來使用。
上述內容就是生產環境數據庫連接超時自動回收問題及解決方法，你們學到知識或技能了嗎？如果還想學到更多技能或者豐富自己的知識儲備，歡迎關注丸趣 TV 行業資訊頻道。
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