[jboss-user] [JCA/JBoss] - please help mysql datasource timeout problem

[jhudson]

Hello,

I am using jboss 4.0.2 with a MySQL datasource (shown below) that has the idle-timeout-minutes property set to 10.  But, after 8 hours of server uptime, I  receive the following error when using connections from this datasource:


Communications link failure due to underlying exception: 
  | 
  | ** BEGIN NESTED EXCEPTION ** 
  | 
  | java.io.EOFException
  | 
  | STACKTRACE:
  | 
  | java.io.EOFException
  | 	at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:1913)
  | 	at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2304)
  | 	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2803)
  | 	at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1573)
  | 	at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1665)
  | 	at com.mysql.jdbc.Connection.execSQL(Connection.java:3176)
  | 	at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1153)
  | 	at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:1266)
  | 	at org.jboss.resource.adapter.jdbc.WrappedPreparedStatement.executeQuery(WrappedPreparedStatement.java:296)
  | 	at org.hibernate.jdbc.AbstractBatcher.getResultSet(AbstractBatcher.java:118)
  | 	at org.hibernate.loader.Loader.getResultSet(Loader.java:1239)
  | 	at org.hibernate.loader.Loader.doQuery(Loader.java:374)
  | 	at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:210)
  | 	at org.hibernate.loader.Loader.loadEntity(Loader.java:1312)
  | 	at org.hibernate.loader.entity.EntityLoader.load(EntityLoader.java:116)
  | 	at  ...

I know that this error will occur if a connection in the pool has been idle for more than 8 hours [default setting] because the underlying connection will go stale.

My datasource file is shown below:

<datasources>
  |         <local-tx-datasource>
  |                 <transaction-isolation>TRANSACTION_READ_COMMITTED</transaction-isolation>
  |                 <jndi-name>jdbc/MySQLDB</jndi-name>
  |                 <connection-url>jdbc:mysql://localhost/db_name?autoReconnectForPools=true&dumpQueriesOnException=true&useServerPrepStmts=false</connection-url>
  |                 <driver-class>com.mysql.jdbc.Driver</driver-class>
  |                 <user-name>****</user-name>
  |                 <password>****</password>
  |                 <idle-timeout-minutes>10</idle-timeout-minutes>
  |                 <min-pool-size>0</min-pool-size>
  |                 <max-pool-size>25</max-pool-size>
  | 
  | <exception-sorter-class-name>com.mysql.jdbc.integration.jboss.ExtendedMysqlExceptionSorter</exception-sorter-class-name>
  |                 <metadata>
  |                         <type-mapping>mySQL</type-mapping>
  |                 </metadata>
  |         </local-tx-datasource>
  | </datasources>

I should never have a connection lasting longer than 10 minutes, right?  I understand that it might be a bit longer than that because the checker runs on a time interval that is half of the lowest idle-timeout-minutes but, not 8 hours...

I would really appreciate any advice you might have to offer.  I have searched and searched for a possible cause and have not found any.  Thank you very much.

Joe Hudson

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