Connection Pool

[armalai]

Environement: Tomcat4.x ,Windows 2000 , Oracle9i

I'm using 75 concurrent users to hit my application using Jmeter.
After 5 hours i'm getting this below error. 

ERROR: Cannot get a connection, pool exhausted

1.Can you please give me an idea to tune up my settings?
2.This is something sue to server's unavailable state?



this is my data base connection setting.

          <Resource name="jdbc/CONTROLLER" scope="Shareable" 
type="javax.sql.DataSource"/>
          <ResourceParams name="jdbc/CONTROLLER">
            <parameter>
              <name>driverClassName</name>
              <value>oracle.jdbc.OracleDriver</value>
            </parameter>
            <parameter>
              <name>url</name>
              <value>jdbc:oracle:oci:@CURACC_DEV</value>
            </parameter>
            <parameter>
              <name>username</name>
              <value>sysadm</value>
            </parameter>
            <parameter>
              <name>password</name>
              <value>sysadmawbs</value>
            </parameter>
            <parameter>
              <name>maxActive</name>
              <value>20</value>
            </parameter>
            <parameter>
              <name>maxWait</name>
              <value>10000</value>
            </parameter>                        
            <parameter>
              <name>maxIdle</name>
              <value>10</value>
            </parameter>
          </ResourceParams>


Thanks.,
MALAI