Add this to context.xml

Resource name="poolname" auth="Container"
type="oracle.jdbc.pool.OracleDataSource"
factory="oracle.jdbc.pool.OracleDataSourceFactory"
connectionCachingEnabled="true"
user="DB" password="DB"
driverClassName="oracle.jdbc.OracleDriver"
url="jdbc:oracle:thin:@192.168.100.1:1521:ORCL"
removeAbandoned="true"
removeAbandonedTimeout="30"
maxActive="20"
maxIdle="10" maxwait="-1"