Connection pooling problems

Hi,

I'm currently running a Tomcat 4.0.6 using a pooled data source as a JNDI
ressource (using the jakarta commons DBCP). The database is a PostgreSQL
7.3. The two computers are separated by a firewall. Everything works fine
except a strange problem I can't solve.

After a day on (it is not very regular), the application can't connect
anymore to the database, i'm getting the following error in the Tomcat's log:

An I/O error has occured while flushing the output - Exception:
java.net.SocketException: Connection reset by peer: socket write error
Stack Trace:

java.net.SocketException: Connection reset by peer: socket write error
at java.net.SocketOutputStream.socketWrite(Native Method)
    at java.net.SocketOutputStream.write(SocketOutputStream.java:96)
    at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:72)
    at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:130)
    at org.postgresql.PG_Stream.flush(PG_Stream.java:352)
    ...

In the postgres log, i'm reading :

Feb  3 21:10:47 XXXXXXX postgres[9934]: [4] LOG:  pq_recvbuf: recv()
failed: Connection reset by peer

My JNDI ressource is configured like that :

  <Resource name="jdbc/refPG" auth="Container" type="javax.sql.DataSource" />
                <ResourceParams name="jdbc/refPG">
                   <parameter>
                      <name>username</name>
                      <value>myusername</value>
                   </parameter>
                   <parameter>
                      <name>password</name>
                      <value>*******</value>
                   </parameter>
                   <parameter>
                      <name>driverClassName</name>
                      <value>org.postgresql.Driver</value>
                   </parameter>
                   <parameter>
                      <name>url</name>
                      <value>jdbc:postgresql://hostname/db</value>
                   </parameter>
                   <parameter>
                      <name>factory</name>
                      <value>org.apache.commons.dbcp.BasicDataSourceFactory</value>
                   </parameter>
                   <parameter>
                      <name>maxActive</name>
                      <value>50</value>
                   </parameter>
                   <parameter>
                      <name>maxIdle</name>
                      <value>10</value>
                   </parameter>
                   <parameter>
                      <name>maxWait</name>
                      <value>10000</value>
                   </parameter>
                   <parameter>
                      <name>removeAbandoned</name>
                      <value>true</value>
                   </parameter>
                   <parameter>
                      <name>removeAbandonedTimeout</name>
                      <value>60</value>
                   </parameter>
                   <parameter>
                      <name>logAbandoned</name>
                      <value>true</value>
                   </parameter>
                </ResourceParams>


Do someone knows why I receive such an error ? I have no information in my
firewall log about denying access, but I suspect the configuration of the
pool being the origin of it. Maybe do I have to use
org.postgresql.jdbc2.optional.PooledDataSource in place of
org.postgresql.Driver in my configuration ?

Any help is welcome.

Thanks

Didrik Pinte
Adhoc Solutions
www.adhocsolutions.com



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