Hi Eduardo,
we were facing similiar issues with a "heavy-load-application" and torque 3.2. The application uses four connection
pools and many connections with a lot of concurrent transactions. The stack trace of the exception was the same as
yours. Other torque based applications developed by us were running fine without running out of connections.
After many days of profiling, debugging and optimizing we tracked down the issues to commons-dbcp, especially to
http://issues.apache.org/jira/browse/DBCP-100.
After updating commons-dbcp from 1.2.1 to 1.2.2 the problems are gone.
Please note: Even if updating commons-dbcp was the solution in our special case, running out of connections is mostly
caused due to programming errors...
cheers
Michael
Eduardo Kinto schrieb:
Hello,
I'm using Torque to connect to my MSSql and MySQL Server database.
Everything is working fine, just one problem, some times Database connection
fail and don't come back (both, mysql and mssql) by it self and I have to
restart my webserver
(where it is running my application).
Running the command netstat, I can't see any connnection to database server.
I'm using:
- torque-3.2.jar
- apache tomcat 5.5.12
- java jdk 1.5.0_06
- RedHat Linux Enterprise 4
And the folowing torque setup for mysql:
torque.dsfactory.APP.factory =
org.apache.torque.dsfactory.SharedPoolDataSourceFactory
torque.dsfactory.APP.connection.driver = com.mysql.jdbc.Driver
torque.dsfactory.APP.connection.url =
jdbc:mysql://IP:PORT/APP?autoReconnect=true
torque.dsfactory.APP.connection.user = yyy
torque.dsfactory.APP.connection.password = xxx
torque.dsfactory.APP.pool.defaultTransactionIsolation=1
torque.dsfactory.APP.pool.maxWait=600000
torque.dsfactory.APP.pool.maxActive=32
torque.dsfactory.APP.pool.maxIdle=32
torque.dsfactory.APP.pool.testOnBorrow=true
torque.dsfactory.APP.pool.validationQuery=SELECT 1
And for MSSqlServer:
torque.dsfactory.APP2.factory =
org.apache.torque.dsfactory.SharedPoolDataSourceFactory
torque.dsfactory.APP2.connection.driver = net.sourceforge.jtds.jdbc.Driver
torque.dsfactory.APP2.connection.url = jdbc:jtds:sqlserver://IP:1433/DATABASE
.. similary to mysql ...
The ERROR message:
org.apache.torque.TorqueException: org.apache.commons.dbcp.SQLNestedException:
Could not retrieve connection info from pool
at
org.apache.torque.TorqueInstance.getConnection(TorqueInstance.java:825)
at org.apache.torque.Torque.getConnection(Torque.java:272)
at org.apache.torque.util.BasePeer.doPSSelect(BasePeer.java:1478)
...
Caused by: org.apache.commons.dbcp.SQLNestedException: Could not retrieve connection info from pool
at
org.apache.commons.dbcp.datasources.SharedPoolDataSource.getPooledConnectionAndInfo(SharedPoolDataSource.java:169)
at
org.apache.commons.dbcp.datasources.InstanceKeyDataSource.getConnection(InstanceKeyDataSource.java:631)
at
org.apache.commons.dbcp.datasources.InstanceKeyDataSource.getConnection(InstanceKeyDataSource.java:615)
at
org.apache.torque.TorqueInstance.getConnection(TorqueInstance.java:821)
... 11 more
Caused by: java.lang.NullPointerException
at
org.apache.commons.collections.SequencedHashMap.removeEntry(SequencedHashMap.java:215)
at
org.apache.commons.collections.SequencedHashMap.removeImpl(SequencedHashMap.java:473)
at
org.apache.commons.collections.SequencedHashMap.remove(SequencedHashMap.java:460)
at org.apache.commons.collections.LRUMap.get(LRUMap.java:93)
at
org.apache.commons.dbcp.datasources.SharedPoolDataSource.getUserPassKey(SharedPoolDataSource.java:176)
at
org.apache.commons.dbcp.datasources.SharedPoolDataSource.getPooledConnectionAndInfo(SharedPoolDataSource.java:165)
... 14 more
Restarting my webserver everything is working fine again. Can't torque
re-establish a valid connection to the database by
it self ?
I have an heavy activity on my MSSql database, sometime I get the following
error message:
Caused by: java.sql.SQLException: I/O Error: Connection reset
at net.sourceforge.jtds.jdbc.TdsCore.executeSQL(TdsCore.java:797)
at
net.sourceforge.jtds.jdbc.JtdsStatement.executeSQL(JtdsStatement.java:332)
at
net.sourceforge.jtds.jdbc.JtdsStatement.executeUpdate(JtdsStatement.java:723)
at
net.sourceforge.jtds.jdbc.JtdsStatement.executeUpdate(JtdsStatement.java:652)
at org.apache.torque.util.BasePeer.executeStatement(BasePeer.java:1294)
... 6 more
Does the error "Connection reset" is telling me I'm losting one connection from
the pool and after losing all
connection I get "Could not retrieve connection info from pool" ? If so, do I
have to create a new connection and
set it on the pool ?
Thank you,
Eduardo.
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