Connection reset using JDBC Oracle thin Driver (towards 10g DB)

Question

Hi we have a home-grown application and a Oracle 10g (10.2.0.1) database.
We created a scheduled servlet that gets a JDBC connection from a persistent connected cache (an OracleDataSource object registered using OracleConnectionCacheManager). The servlet runs every 15 minutes and runs the query "SELECT SYSTIME FROM DUAL" on 10g Database as XYZ user. The datapool was created yday on web-app and all queries ran successfully for about 5 hours after which it reported a connection reset error.
I can then conclude that we cannot keep the server session alive for the JDBC client by running frequent SQL queries.
We didnt get any messages on the DB server side that indicate the release of the session
Ultimately, we are struggling with reset connections from our applications that are
using the JDBC thin oracle driver; after a couple of hours of idle
connections, we receive the below error from the JDBC driver:
Jul 5, 2007 10:59:53 AM oracle.jdbc.driver.DatabaseError throwSqlException
WARNING: DatabaseError.throwSqlException(e): Unable to find ORA number from
exception Jul 5, 2007 10:59:53 AM oracle.jdbc.driver.DatabaseError
findMessage
WARNING: DatabaseError.findMessage(errNum, obj): returned Io exception:
Connection reset Jul 5, 2007 10:59:53 AM
oracle.jdbc.driver.PhysicalConnection getWarnings
INFO: PhysicalConnection.getWarnings()
Any suggestions please ?
Vk

Answer 1

The code itself is fine; the problem is with one of:
1) the connection URL
2) intermediate networking
3) the database itself
1) your connection URL is "jdbc:oracle:thin:@127.0.0.1:1521:orcl"
- is Oracle really running on the default port, 1521
- is the installation SID really "orcl"
2) lots of possibilities, but only a couple are likely
- is TCP/IP configured and running on your host
- is there a persoanl firewall rpduct running? perhaps it's blocking the connection
3) Is Oracle running?
Is the listener running?