This is an interesting stack trace because the problem is happening
when it tries to set the transaction isolation level...
Which isolation level do you have configured? This may not be the
problem since this is one of the first things that happens when a new
connection is created or when an existing connection is re-used. This
might be good to look into though.
-David
On Oct 23, 2006, at 4:41 PM, Hans Holmlund wrote:
The Newer versions of the MySQL connector doesn't support
autoReconnect anymore (however there is a property
enableDeprecatedAutoreconnect, default is false, which can change
that). The reason for deprecating this feature might be valid (and
I don't have any opinion on that) but it will cause a lot of problem.
Unfortunately so does MySQLs suggested method not work properly
either. This might be something with how the pooling is done in
EntityEngine. When a connection is disconnected by the DB (i.e.
after wait_timeout seconds, a MySQL property that can be changed) a
SQLException should be thrown if that connection is used again. But
what I get is the following;
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:3118)
at com.mysql.jdbc.Connection.setTransactionIsolation
(Connection.java:5499)
at
org.ofbiz.minerva.pool.jdbc.xa.wrapper.XAConnectionImpl.setTransaction
Isolation(XAConnectionImpl.java:117)
at
org.ofbiz.minerva.pool.jdbc.xa.XAConnectionFactory.prepareObject
(XAConnectionFactory.java:412)
at org.ofbiz.minerva.pool.ObjectPool.getObject
(ObjectPool.java:645)
at
org.ofbiz.minerva.pool.jdbc.xa.XAPoolDataSource.getConnection
(XAPoolDataSource.java:355)
at
org.ofbiz.entity.transaction.MinervaConnectionFactory.getConnection
(MinervaConnectionFactory.java:56)
at
org.ofbiz.geronimo.GeronimoTransactionFactory.getConnection
(GeronimoTransactionFactory.java:94)
at
org.ofbiz.entity.transaction.TransactionFactory.getConnection
(TransactionFactory.java:104)
at org.ofbiz.entity.jdbc.ConnectionFactory.getConnection
(ConnectionFactory.java:86)
I suppose ConnectionFactory might be a good place to catch the
exceptions, but I am not sure about what to do with the
EOFException. Does anyone has any ideas?
"why not just schedule a simple service that will hit the database
every hour or so." This is not a good idea, unless it is done from
inside the pool.
/ Hans Holmlund
Si Chen skrev:
The OFBiz JDBC url already has autoReconnect=true.
That was my first contribution ever to ofbiz!
On Oct 21, 2006, at 6:38 AM, Hans Holmlund wrote:
I have a problem with MySQL connections who fails. I get a
com.mysql.jdbc.exceptions.MySQLNonTransientConnectionException. I
found an explanation for this in an help page from MySQL (http://
dev.mysql.com/doc/refman/5.0/en/connector-j-usagenotes-
troubleshooting.html#qandaitem-24-3-5-3-4):
" MySQL closes connections after 8 hours of inactivity. You
either need to use a connection pool that handles stale
connections or use the "autoReconnect" parameter. /-/ *Note. *
Use of the |autoReconnect| option is not recommended because
there is no safe method of reconnecting to the MySQL server
without risking some corruption of the connection state or
database state information. Instead, you should use a connection
pool which will enable your application to connect to the MySQL
server using an available connection from the pool. The |
autoReconnect| facility is deprecated, and may be removed in a
future release."
This (managing stale connection) is not how EntityEngine has done
its implementation, with EE you can only set autoReconnect to
true. I wonder if you have planned to change this. In the above
mentioned page there is some example code, so this should be an
easy thing to fix.
Thanks,
Hans Holmlund
org.ofbiz.geronimo.GeronimoTransactionFactory - Geronimo is the
configured transaction manager but there was an error getting a
database Connection through Geronimo for the mysql datasource.
Please check your configuration, class path, etc.
java.lang.RuntimeException: Unable to setTransactionIsolation:
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:3118)
at com.mysql.jdbc.Connection.setTransactionIsolation
(Connection.java:5499)
at
org.ofbiz.minerva.pool.jdbc.xa.wrapper.XAConnectionImpl.setTransacti
onIsolation(XAConnectionImpl.java:117)
at
org.ofbiz.minerva.pool.jdbc.xa.XAConnectionFactory.prepareObject
(XAConnectionFactory.java:412)
at org.ofbiz.minerva.pool.ObjectPool.getObject
(ObjectPool.java:645)
at
org.ofbiz.minerva.pool.jdbc.xa.XAPoolDataSource.getConnection
(XAPoolDataSource.java:355)
at
org.ofbiz.entity.transaction.MinervaConnectionFactory.getConnection(
MinervaConnectionFactory.java:56)
at
org.ofbiz.geronimo.GeronimoTransactionFactory.getConnection
(GeronimoTransactionFactory.java:94)
at
org.ofbiz.entity.transaction.TransactionFactory.getConnection
(TransactionFactory.java:104)
at org.ofbiz.entity.jdbc.ConnectionFactory.getConnection
(ConnectionFactory.java:82)
at org.ofbiz.entity.jdbc.SQLProcessor.getConnection
(SQLProcessor.java:268)
at org.ofbiz.entity.jdbc.SQLProcessor.prepareStatement
(SQLProcessor.java:374)
at org.ofbiz.entity.jdbc.SQLProcessor.prepareStatement
(SQLProcessor.java:358)
at org.ofbiz.entity.datasource.GenericDAO.select
(GenericDAO.java:539)
at org.ofbiz.entity.datasource.GenericDAO.select
(GenericDAO.java:510)
at
org.ofbiz.entity.datasource.GenericHelperDAO.findByPrimaryKey
(GenericHelperDAO.java:90)
at org.ofbiz.entity.GenericDelegator.findByPrimaryKey
(GenericDelegator.java:1248)
at org.ofbiz.entity.GenericDelegator.findByPrimaryKey
(GenericDelegator.java:1304)
Best Regards,
Si
[EMAIL PROTECTED]
