Setting ObjectCacheDescriptor programatically

I'm having trouble setting up a JdbcConnectionDescriptor programatically. 
I'm adding a ConnectionPoolDescriptor, SequenceDescriptor and an 
ObjectCacheDescriptor to the JdbcConnectionDescriptor but the 
ObjectCacheDescriptor doesn't appear when I call 
JdbcConnectionDescriptor.toXML() and doesn't have any effect when the 
application is running. Here is my code:

********

JdbcConnectionDescriptor jcd = new JdbcConnectionDescriptor();
jcd.setJcdAlias("mainConnection");
jcd.setDatasourceName("java:comp/env/jdbc/mainConnection");
jcd.setDbms("MySQL");
jcd.setJdbcLevel(3.0);
jcd.setBatchMode(false);
jcd.setUseAutoCommit(1);
jcd.setIgnoreAutoCommitExceptions(false);

ObjectCacheDescriptor ocd = new 
ObjectCacheDescriptor(ObjectCacheTwoLevelImpl.class);
ocd.addAttribute("applicationCache", 
"org.apache.ojb.broker.cache.ObjectCacheDefaultImpl");
ocd.addAttribute("copyStrategy", 
"org.apache.ojb.broker.cache.ObjectCacheTwoLevelImpl$CopyStrategyImpl");
ocd.addAttribute("timeout", "900");
ocd.addAttribute("autoSync", "true");
ocd.addAttribute("cachingKeyType", "1");
ocd.addAttribute("useSoftReferences", "true");
log.debug(ocd.toXML());

ConnectionPoolDescriptor cpd = new ConnectionPoolDescriptor();
cpd.setLogAbandoned(true);
cpd.setValidationQuery("SELECT 1");

jcd.setConnectionPoolDescriptor(cpd);
jcd.setObjectCacheDescriptor(ocd);
jcd.setSequenceDescriptor(new SequenceDescriptor(jcd, 
SequenceManagerNativeImpl.class));
connectionRepository.addDescriptor(jcd);

log.debug(jcd.toXML());
*********

I can't use an XML file for reasons I won't go into here. Can anyone see 
what I might be doing wrong here? Has anyone else attempted to do this? Any 
help would be much appreciated.

Thanks,

Steve Vangasse

Boardshop.co.uk - Board Sports Equipment and Clothing for the UK and Europe
www.boardshop.co.uk
0870 0600 688