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https://issues.apache.org/jira/browse/DBCP-244?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12991367#comment-12991367
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tangjie commented on DBCP-244:
------------------------------
the connection hang forever.
> Connection socket hangs sporadically in DBCP 1.2.2 but not 1.2.1
> ----------------------------------------------------------------
>
> Key: DBCP-244
> URL: https://issues.apache.org/jira/browse/DBCP-244
> Project: Commons Dbcp
> Issue Type: Bug
> Affects Versions: 1.2.2
> Environment: Fedora Core 3, MySQL 4.1.22. with the latest driver
> (5.07). Exceptions only occur in the "job processing" JVM, which sits idle
> for long periods of time and occasionally wakes up to interact with the
> database.
> Reporter: ori
> Fix For: 1.3
>
>
> I think I've traced an exception to DBCP's code.
> Communication with the database is hanging sporadically in a production
> environment. If I don't set the socketTimeout property on the underlying
> connection, it will hang forever. With the socketTimeout property, I get the
> following exception:
> -------
> com.mysql.jdbc.CommunicationsException: Communications link failure due to
> underlying exception:
> ** BEGIN NESTED EXCEPTION **
> java.net.SocketTimeoutException
> MESSAGE: Read timed out
> STACKTRACE:
> java.net.SocketTimeoutException: Read timed out
> at java.net.SocketInputStream.socketRead0(Native Method)
> at java.net.SocketInputStream.read(SocketInputStream.java:129)
> at
> com.mysql.jdbc.util.ReadAheadInputStream.fill(ReadAheadInputStream.java:113)
> at
> com.mysql.jdbc.util.ReadAheadInputStream.readFromUnderlyingStreamIfNecessary(ReadAheadInputStream.java:160)
> at
> com.mysql.jdbc.util.ReadAheadInputStream.read(ReadAheadInputStream.java:188)
> at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:1994)
> at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2411)
> at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2916)
> at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1631)
> at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1723)
> at com.mysql.jdbc.Connection.execSQL(Connection.java:3250)
> at com.mysql.jdbc.Statement.executeUpdate(Statement.java:1355)
> at com.mysql.jdbc.Statement.executeUpdate(Statement.java:1270)
> at
> org.apache.commons.dbcp.DelegatingStatement.executeUpdate(DelegatingStatement.java:228)
> ...
> -------
> It always happens in an infrequently used JVM (not an app server handling
> frequent connections). So it's likely the offending connection was asleep for
> a long time before the exception occurs.
> I've confirmed that this issue only occurs using 1.2.2 and not 1.2.1. I've
> been looking through the changelogs but can't find anything that would cause
> this behavior.
> Does somebody familiar with the codebase have any idea what change
> (1.2.1->1.2.2) could be causing this behavior?
> Thanks
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