SQL Error 0 SQLState 08S01 Communications link failure

Question

I am getting this error  not so frequently    2013-05-08 16 44 35 786  WARN  JDBCExceptionReporter java 100   org hibernate util JDBCExceptionReporter  logExceptions  - SQL Error  0  SQLState  08S01 2013-05-08 16 44 35 786 ERROR  JDBCExceptionReporter java 101   org hibernate util JDBCExceptionReporter  logExceptions  - 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  2013-05-08 16 44 35 833 ERROR  AdminDaoImpl java 297   com myapp admin db AdminDaoImpl  createFilePackage  - data-upload  Exception while adding new file package org hibernate exception JDBCConnectionException  Cannot open connection     at org hibernate exception SQLStateConverter convert SQLStateConverter java 97   hibernate-core-3 3 2 GA jar 3 3 2 GA      at org hibernate exception JDBCExceptionHelper convert JDBCExceptionHelper java 66   hibernate-core-3 3 2 GA jar 3 3 2 GA      at org hibernate exception JDBCExceptionHelper convert JDBCExceptionHelper java 52   hibernate-core-3 3 2 GA jar 3 3 2 GA      at org hibernate jdbc ConnectionManager openConnection ConnectionManager java 449   hibernate-core-3 3 2 GA jar 3 3 2 GA      at org hibernate jdbc ConnectionManager getConnection ConnectionManager java 167   hibernate-core-3 3 2 GA jar 3 3 2 GA      at org hibernate jdbc JDBCContext connection JDBCContext java 142   hibernate-core-3 3 2 GA jar 3 3 2 GA      at org hibernate transaction JDBCTransaction begin JDBCTransaction java 85   hibernate-core-3 3 2 GA jar 3 3 2 GA      at org hibernate impl SessionImpl beginTransaction SessionImpl java 1354   hibernate-core-3 3 2 GA jar 3 3 2 GA      at com myapp admin db AdminDaoImpl  createFilePackage AdminDaoImpl java 182   AdminDaoImpl class na      at com myapp admin ctrl UploadController processUploadZip UploadController java 217   UploadController class na      at sun reflect GeneratedMethodAccessor106 invoke Unknown Source   na na      at sun reflect DelegatingMethodAccessorImpl invoke DelegatingMethodAccessorImpl java 25   na 1 6 0 35      at java lang reflect Method invoke Method java 597   na 1 6 0 35      at org springframework web method support InvocableHandlerMethod invoke InvocableHandlerMethod java 212   spring-web-3 1 0 RELEASE jar 3 1 0 RELEASE      at org springframework web method support InvocableHandlerMethod invokeForRequest InvocableHandlerMethod java 126   spring-web-3 1 0 RELEASE jar 3 1 0 RELEASE      at org springframework web servlet mvc method annotation ServletInvocableHandlerMethod invokeAndHandle ServletInvocableHandlerMethod java 96   spring-webmvc-3 1 0 RELEASE jar 3 1 0 RELEASE      at org springframework web servlet mvc method annotation RequestMappingHandlerAdapter invokeHandlerMethod RequestMappingHandlerAdapter java 617   spring-webmvc-3 1 0 RELEASE jar 3 1 0 RELEASE      at org springframework web servlet mvc method annotation RequestMappingHandlerAdapter handleInternal RequestMappingHandlerAdapter java 578   spring-webmvc-3 1 0 RELEASE jar 3 1 0 RELEASE      at org springframework web servlet mvc method AbstractHandlerMethodAdapter handle AbstractHandlerMethodAdapter java 80   spring-webmvc-3 1 0 RELEASE jar 3 1 0 RELEASE      at org springframework web servlet DispatcherServlet doDispatch DispatcherServlet java 900   spring-webmvc-3 1 0 RELEASE jar 3 1 0 RELEASE      at org springframework web servlet DispatcherServlet doService DispatcherServlet java 827   spring-webmvc-3 1 0 RELEASE jar 3 1 0 RELEASE      at org springframework web servlet FrameworkServlet processRequest FrameworkServlet java 882   spring-webmvc-3 1 0 RELEASE jar 3 1 0 RELEASE      at org springframework web servlet FrameworkServlet doPost FrameworkServlet java 789   spring-webmvc-3 1 0 RELEASE jar 3 1 0 RELEASE      at javax servlet http HttpServlet service HttpServlet java 647   servlet-api jar na      at javax servlet http HttpServlet service HttpServlet java 728   servlet-api jar na      at org apache catalina core ApplicationFilterChain internalDoFilter ApplicationFilterChain java 305   catalina jar 7 0 35      at org apache catalina core ApplicationFilterChain doFilter ApplicationFilterChain java 210   catalina jar 7 0 35      at org apache catalina core StandardWrapperValve invoke StandardWrapperValve java 222   catalina jar 7 0 35      at org apache catalina core StandardContextValve invoke StandardContextValve java 123   catalina jar 7 0 35      at org apache catalina authenticator AuthenticatorBase invoke AuthenticatorBase java 472   catalina jar 7 0 35      at org apache catalina core StandardHostValve invoke StandardHostValve java 171   catalina jar 7 0 35      at org apache catalina valves ErrorReportValve invoke ErrorReportValve java 99   catalina jar 7 0 35      at org apache catalina core StandardEngineValve invoke StandardEngineValve java 118   catalina jar 7 0 35      at org apache catalina connector CoyoteAdapter service CoyoteAdapter java 407   catalina jar 7 0 35      at org apache coyote ajp AjpProcessor process AjpProcessor java 200   tomcat-coyote jar 7 0 35      at org apache coyote AbstractProtocol AbstractConnectionHandler process AbstractProtocol java 589   tomcat-coyote jar 7 0 35      at org apache tomcat util net JIoEndpoint SocketProcessor run JIoEndpoint java 310   tomcat-coyote jar 7 0 35      at java util concurrent ThreadPoolExecutor Worker runTask ThreadPoolExecutor java 886   na 1 6 0 35      at java util concurrent ThreadPoolExecutor Worker run ThreadPoolExecutor java 908   na 1 6 0 35      at java lang Thread run Thread java 662   na 1 6 0 35  Caused by  com mysql jdbc exceptions jdbc4 CommunicationsException  Communications link failure   I have two web  spring mvc   hibernate   mysql  applications hosted on shared server   1  main app to show files for download  which is inserted through admin app   2  admin app with CRUD operations  This error appears sometime  when I am using  admin  application to upload files for  main  app  lets say may be after successfully uploading processing around 100-120 files requests and on each request hitting database with 10-20 insert update queries   Hosting Details   Private tomcat hosting java 1 6 0 35-b10 tomcat 7 0 35 heap size 288MB MySQL Server 5 commons-dbcp 1 2 2 mysql-connector-java 5 1 9   Database   Hibernate   DBCP properties    lt bean id  dbDataSource  class  org apache commons dbcp BasicDataSource  gt       lt property name  driverClassName  value  com mysql jdbc Driver    gt       lt property name  username  value  test    gt       lt property name  password  value  test    gt       lt property name  url  value  jdbc mysql   localhost my database useUnicode yes amp characterEncoding UTF-8    gt        lt  -- DBCP Connection Pool Settings -- gt       lt property name  defaultAutoCommit  value  true    gt       lt property name  initialSize  value  10    gt       lt property name  maxActive  value  500    gt       lt property name  maxIdle  value  8    gt       lt property name  minIdle  value  0    gt       lt property name  maxWait  value  30000    gt       lt property name  validationQuery  value  SELECT 1    gt       lt property name  testOnBorrow  value  true    gt       lt property name  testOnReturn  value  false    gt       lt property name  testWhileIdle  value  false    gt       lt property name  timeBetweenEvictionRunsMillis  value  -1    gt       lt property name  numTestsPerEvictionRun  value  3    gt       lt property name  minEvictableIdleTimeMillis  value  180000    gt       lt property name  poolPreparedStatements  value  true    gt       lt property name  maxOpenPreparedStatements  value  25    gt       lt property name  accessToUnderlyingConnectionAllowed  value  false    gt       lt property name  removeAbandoned  value  false    gt       lt property name  removeAbandonedTimeout  value  300    gt       lt property name  logAbandoned  value  false    gt   lt  bean gt   hibernate dialect org hibernate dialect MySQLDialect hibernate hbm2ddl auto none hibernate jdbc batch size 100 hibernate show sql false hibernate format sql false hibernate cache use second level cache true hibernate cache use query cache false hibernate cache provider class org hibernate cache NoCacheProvider hibernate current session context class thread   Concerned Code   public String createFilePackage FilePackage package        String message            Session session   getSessionFactory   openSession        Transaction tx   null      try           tx   session beginTransaction                handling package  around 10-14 DB insert  10 SELECT and 5 update queries on same session          tx commit           catch Exception e            logger error  file-upload  Exception while adding new font package   e           if tx    null    tx rollback            finally           session close              return message      any advise how to solve this issue

User · Accepted Answer

The communication link between the driver and the data source to which the driver was attempting to connect failed before the function completed processing  So usually its a network error  This could be caused by packet drops or badly configured Firewall Switch

User · Answer

I m answering on specific to this error code 08s01   usually  MySql close socket connections are some interval of time that is wait timeout defined on MySQL server-side which by default is 8hours  so if a connection will timeout after this time and the socket will throw an exception which SQLState is  quot 08s01 quot   1 use connection pool to execute Query  make sure the pool class has a function to make an inspection of the connection members before it goes time out  2 give a value of  lt wait timeout gt  greater than the default  but the largest value is 24 days 3 use another parameter  in your connection URL  but this method is not recommended  and maybe deprecated

User · Answer

Check your server config file  etc mysql my cnf - verify bind address is not set to 127 0 0 1  Set it to 0 0 0 0 or comment it out then restart server with   sudo service mysql restart

User · Answer

Could be due to the TCP protocol turned off   How to check enable  https   dba stackexchange com questions 11377 cannot-connect-to-ms-sql-2008-r2-by-dbvisualizer-native-sspi-library-not-loade 144097 144097

[java] SQL Error: 0, SQLState: 08S01 Communications link failure

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