Importance of JDBC pooling in JDBC conn

what is the importance of JDBC POOLS befor configure a jdbc conn in webMethods and how can i configure jdbc pools . pls … any thought.

I am using following
Operating system - Windows XP SP-2
Databse - Oracle 9i (version-
JVM version - 1.4
driverType -thin

extra:- I have already copied ojdbc14.jar file into
1. C:\Program Files\webMethods61\IntegrationServer\lib\jars\ojdbc14.jar
2. C:\Program Files\webMethods61\IntegrationServer\lib\jars\

Connection _____________JDBC Adapter Connection

Connection Properties
Transaction Type ________NO_TRANSACTION
DataSource Class ________oracle.jdbc.pool.OracleConnectionPoolDataSource
serverName _____________localhost5555
user ___________________system
password _______________******
databaseName __________WMDB
portNumber _____________1433
networkProtocol _________tcp
Other Properties _________driverType=thin

Connection Management Properties
Enable Connection Pooling __true
Minimum Pool Size ________1
Maximum Pool Size ________10
Pool Increment Size _______1
Block Timeout ____________1000
Expire Timeout ___________1000
Startup Retry Count _______0
Startup Backoff Timeout ____10

And last whwn i goes to enable the connection than i find following error

[ART.118.5042] Adapter Runtime (Connection): Unable to enable connection resource MYJDBC:MYCON.[ART.118.5036] Adapter Runtime (Connection): Unable to configure connection manager.[ADA.1.204] Cannot connect to the database with DataSource class “oracle.jdbc.pool.OracleConnectionPoolDataSource”.Io exception: The Network Adapter could not establish the connection

Plz help me out from this problem plz …thanx

Double check your server name. localhost5555 doesn’t seem to be right. Try localhost.

Connection pooling

You have already configured a Connection pool in the Connection Management Properties Section.