Using JRun4.0 i have created a datasource with DB2 like this.

<data-source>
<dbname>jdbc</dbname>
<driver>COM.ibm.db2.jdbc.app.DB2Driver</driver>
<url>jdbc:db2:TEST_SYS</url>
<username>cogns</username>
<password>2B4AA2F4D0BAD3ED0A9005B832E7C897</password>
<encrypted>true</encrypted>
<encryption-class>jrun.security.JRunCrypterForTwofish</encryption-
class>
<native-results>true</native-results>
<remove-on-exceptions>true</remove-on-exceptions>
<pool-statements>true</pool-statements>
<initial-connections>1</initial-connections>
<connection-timeout>2500</connection-timeout>
<transaction-timeout>20</transaction-timeout>
<cache-enabled>false</cache-enabled>
<cache-size>5</cache-size>
<cache-refresh-interval>30</cache-refresh-interval>
<jndi-name>jdbc</jndi-name>
<poolname>Pool</poolname>
<minimum-size>0</minimum-size>
<maximum-size>2147483647</maximum-size>
<user-timeout>20</user-timeout>
<skimmer-frequency>420</skimmer-frequency>
<shrink-by>5</shrink-by>
<maximum-soft>true</maximum-soft>
<debugging>false</debugging>
<disable-pooling>false</disable-pooling>
<description />
<isolation-level>READ_COMMITTED</isolation-level></data-source>.

When i try to run >15 threads at a time to invoke a stored procedure
using apache JMeter there is no response from JRun. But it is working
fine with 15 threads. What could be the problem. Is it with Jmeter or
the way i have created the datasource?.

Is it a problem with evaluation/developer version?