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Shan R
 Post subject: Auto reconnect to Database using c3p0 connection pool
PostPosted: Tue Oct 25, 2005 2:59 am 
Newbie

Joined: Tue Oct 25, 2005 2:45 am
Posts: 2
Hi,

How can I reconnect to the database, when a network failure/database server is down and up.?

I am using c3p0 connetion pool properties with hibernate. I set the following in hibernate.properties.

hibernate.c3p0.timeout=0
hibernate.connection.autoReconnect=true
hibernate.connection.driver_class=oracle.jdbc.driver.OracleDriver
hibernate.c3p0.max_statements=10
hibernate.dialect=net.sf.hibernate.dialect.Oracle9Dialect
hibernate.c3p0.max_size=15
hibernate.c3p0.idle_test_period=30
hibernate.c3p0.validate=true
hibernate.c3p0.min_size=1

Eventhough I set hibernate.connection.autoReconnect=true its not getting connected to DB.

Your reply is appreciated.
Thanking you.
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gabby
 Post subject:
PostPosted: Tue Oct 25, 2005 4:50 am 
Beginner
Beginner

Joined: Fri Aug 20, 2004 3:45 pm
Posts: 22
Location: Florence - ITALY
For an old project (hibernate 2) I was using this configuration:

hibernate.properties
Code:
hibernate.c3p0.max_size=20
hibernate.c3p0.idle_test_period=30

c3p0.properties
Code:
c3p0.testConnectionOnCheckin=true
c3p0.minPoolSize=1
c3p0.maxPoolSize=10
c3p0.checkoutTimeout=10000
c3p0.maxIdleTime=80
c3p0.automaticTestTable=test_c3p0
c3p0.acquireRetryAttemps=100000
c3p0.acquireRetryDelay=30
c3p0.breakAfterAcquireFailure=false


I made many tests and this configuration do the works.

Gianni
Florence - ITALY
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Shan R
 Post subject:
PostPosted: Tue Oct 25, 2005 11:43 am 
Newbie

Joined: Tue Oct 25, 2005 2:45 am
Posts: 2
Hi Gianni,

Thanks for your reply. But Still I have hard time here.

I have set following in hibernate.properties

hibernate.c3p0.timeout=100
hibernate.connection.autoReconnect=true
hibernate.connection.driver_class=oracle.jdbc.driver.OracleDriver
hibernate.c3p0.max_statements=10
hibernate.dialect=net.sf.hibernate.dialect.Oracle9Dialect
hibernate.c3p0.max_size=15
hibernate.c3p0.idle_test_period=30
hibernate.c3p0.validate=true
hibernate.c3p0.min_size=1
hibernate.connection.autoReconnectForPools=true

The following in c3p0.properties

c3p0.acquireRetryDelay=1000
c3p0.acquireRetryAttempts=100000
c3p0.breakAfterAcquireFailure=false
c3p0.autoCommitOnClose=true
c3p0.testConnectionOnCheckin=true

My work around is as follows:

After starting up my Server ( JBoss) , I used to unplug my network connection ,which inturn automatically disconnect my application from database server. Then after some time I re-plug the network.
Now, the auto reconnection is not getting.


I got the following exception :

19:11:19,363 INFO [NewPooledConnection] [c3p0] Exceptions occurred while trying
to close a PooledConnection's resources normally.
19:11:19,363 INFO [NewPooledConnection] [c3p0] NewPooledConnection close Except
ion.
java.sql.SQLException: Io exception: Connection reset by peer: socket write erro
r
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java
:125)
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java
:162)
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java
:274)
at oracle.jdbc.driver.T4CConnection.logoff(T4CConnection.java:393)
at oracle.jdbc.driver.PhysicalConnection.close(PhysicalConnection.java:1
036)
at com.mchange.v2.c3p0.impl.NewPooledConnection.close(NewPooledConnectio
n.java:405)
at com.mchange.v2.c3p0.impl.NewPooledConnection.close(NewPooledConnectio
n.java:135)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1.destroyResource(C
3P0PooledConnectionPool.java:208)
at com.mchange.v2.resourcepool.BasicResourcePool$5.run(BasicResourcePool
.java:634)
at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(Thre
adPoolAsynchronousRunner.java:368)
19:11:19,378 WARN [BasicResourcePool] Failed to destroy resource: com.mchange.v
2.c3p0.impl.NewPooledConnection@1b90c55
java.sql.SQLException: Some resources failed to close properly while closing com
.mchange.v2.c3p0.impl.NewPooledConnection@1b90c55
at com.mchange.v2.c3p0.impl.NewPooledConnection.close(NewPooledConnectio
n.java:418)
at com.mchange.v2.c3p0.impl.NewPooledConnection.close(NewPooledConnectio
n.java:135)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1.destroyResource(C
3P0PooledConnectionPool.java:208)
at com.mchange.v2.resourcepool.BasicResourcePool$5.run(BasicResourcePool
.java:634)
at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(Thre
adPoolAsynchronousRunner.java:368)
19:11:46,784 WARN [BasicResourcePool] BasicResourcePool: An idle resource is br
oken and will be purged.
java.sql.SQLException: Connection is invalid
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1.testPooledConnect
ion(C3P0PooledConnectionPool.java:196)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1.refurbishIdleReso
urce(C3P0PooledConnectionPool.java:136)
at com.mchange.v2.resourcepool.BasicResourcePool$AsyncTestIdleResourceTa
sk.run(BasicResourcePool.java:1394)
at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(Thre
adPoolAsynchronousRunner.java:368)
19:11:46,800 WARN [BasicResourcePool] BasicResourcePool: An idle resource is br
oken and will be purged.
java.sql.SQLException: Connection is invalid
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1.testPooledConnect
ion(C3P0PooledConnectionPool.java:196)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1.refurbishIdleReso
urce(C3P0PooledConnectionPool.java:136)
at com.mchange.v2.resourcepool.BasicResourcePool$AsyncTestIdleResourceTa
sk.run(BasicResourcePool.java:1394)
at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(Thre
adPoolAsynchronousRunner.java:368)
19:11:46,800 WARN [BasicResourcePool] BasicResourcePool: An idle resource is br
oken and will be purged.
java.sql.SQLException: Connection is invalid
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1.testPooledConnect
ion(C3P0PooledConnectionPool.java:196)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1.refurbishIdleReso
urce(C3P0PooledConnectionPool.java:136)
at com.mchange.v2.resourcepool.BasicResourcePool$AsyncTestIdleResourceTa
sk.run(BasicResourcePool.java:1394)
at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(Thre
adPoolAsynchronousRunner.java:368)
19:11:46,816 WARN [BasicResourcePool] BasicResourcePool: An idle resource is br
oken and will be purged.
java.sql.SQLException: Connection is invalid
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1.testPooledConnect
ion(C3P0PooledConnectionPool.java:196)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1.refurbishIdleReso
urce(C3P0PooledConnectionPool.java:136)
at com.mchange.v2.resourcepool.BasicResourcePool$AsyncTestIdleResourceTa
sk.run(BasicResourcePool.java:1394)
at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(Thre
adPoolAsynchronousRunner.java:368)
19:11:46,816 WARN [BasicResourcePool] BasicResourcePool: An idle resource is br
oken and will be purged.
java.sql.SQLException: Connection is invalid
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1.testPooledConnect
ion(C3P0PooledConnectionPool.java:196)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1.refurbishIdleReso
urce(C3P0PooledConnectionPool.java:136)
at com.mchange.v2.resourcepool.BasicResourcePool$AsyncTestIdleResourceTa
sk.run(BasicResourcePool.java:1394)
at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(Thre
adPoolAsynchronousRunner.java:368)
19:12:06,769 WARN [ThreadPoolAsynchronousRunner] com.mchange.v2.async.ThreadPoo
lAsynchronousRunner$DeadlockDetector@b8f09c -- APPARENT DEADLOCK!!! Creating eme
rgency threads for unassigned pending tasks!
19:12:06,769 WARN [ThreadPoolAsynchronousRunner] com.mchange.v2.async.ThreadPoo
lAsynchronousRunner$DeadlockDetector@b8f09c -- APPARENT DEADLOCK!!! Complete Sta
tus: [num_managed_threads: 3, num_active: 3; activeTasks: com.mchange.v2.resourc
epool.BasicResourcePool$5@1bcb91e (com.mchange.v2.async.ThreadPoolAsynchronousRu
nner$PoolThread-#1), com.mchange.v2.resourcepool.BasicResourcePool$5@11d6176 (co
m.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#0), com.mchange.v2.r
esourcepool.BasicResourcePool$5@1e990b4 (com.mchange.v2.async.ThreadPoolAsynchro
nousRunner$PoolThread-#2); pendingTasks: com.mchange.v2.c3p0.stmt.GooGooStatemen
tCache$2@11b1b6d, com.mchange.v2.resourcepool.BasicResourcePool$5@a5bfd5, com.mc
hange.v2.c3p0.stmt.GooGooStatementCache$2@1d56250, com.mchange.v2.c3p0.stmt.GooG
ooStatementCache$2@298bbf, com.mchange.v2.resourcepool.BasicResourcePool$5@195c1
4c, com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@c5a1ea, com.mchang
ge.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#0); pendingTasks: com.mchan
ge.v2.resourcepool.BasicResourcePool$AcquireTask@62e21b]
19:13:12,737 WARN [JDBCExceptionReporter] SQL Error: 17002, SQLState: null
19:13:12,737 ERROR [JDBCExceptionReporter] Io exception: Connection reset by pee
r: socket write error
19:13:12,737 WARN [JDBCExceptionReporter] SQL Error: 17002, SQLState: null
19:13:12,737 ERROR [JDBCExceptionReporter] Io exception: Connection reset by pee
r: socket write error
19:13:12,753 WARN [TransactionImpl] XAException: tx=TransactionImpl:XidImpl [Fo
rmatId=257, GlobalId=SHANMUGAM//481, BranchQual=] errorCode=XA_UNKNOWN(0)
org.jboss.resource.connectionmanager.JBossLocalXAException: could not commit loc
al tx; - nested throwable: (org.jboss.resource.JBossResourceException: SQLExcept
ion; - nested throwable: (java.sql.SQLException: Closed Connection))
at org.jboss.resource.connectionmanager.TxConnectionManager$LocalXAResou
rce.commit(TxConnectionManager.java:701)
at org.jboss.tm.TransactionImpl.commitResources(TransactionImpl.java:165
6)
at org.jboss.tm.TransactionImpl.commit(TransactionImpl.java:375)
at org.jboss.ejb.plugins.TxInterceptorCMT.endTransaction(TxInterceptorCM
T.java:458)
at org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxIntercep
torCMT.java:326)
at org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:1
50)
at org.jboss.ejb.plugins.SecurityInterceptor.invoke(SecurityInterceptor.


Please any one help me on this issue.

Thanks in advance.
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gabby
 Post subject:
PostPosted: Wed Oct 26, 2005 2:46 pm 
Beginner
Beginner

Joined: Fri Aug 20, 2004 3:45 pm
Posts: 22
Location: Florence - ITALY
Try to use ALL the property of my properties file.
For example, use:

Code:
c3p0.checkoutTimeout=10000
c3p0.automaticTestTable=test_c3p0


Code:
c3p0.maxIdleTime=80

This property seem to be very useful. With the default value "0", the connection never expire. See the manul:

Quote:
maxIdleTime
Default: 0
Seconds a Connection can remain pooled but unused before being discarded. Zero means idle connections never expire.


I think that the property maxIdleTime, maybe solve youre problem.

Gianni

P.S. Please, rate to "yes" my answer if solve your problem.[/b]
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