code: @Override
  	public void updateCheckpointData(CheckpointDataKey key, CheckpointData value) {
  		logger.entering(CLASSNAME, "updateCheckpointData", new Object[] {key, value});
  		CheckpointData data = queryCheckpointData(key.getCommaSeparatedKey());
  		if(data != null) {
  			updateCheckpointData(key.getCommaSeparatedKey(), value);
  		} else {
  			createCheckpointData(key, value);
  		}
  		logger.exiting(CLASSNAME, "updateCheckpointData");
  	}
docs: /* (non-Javadoc)
  @see com.ibm.jbatch.container.services.impl.AbstractPersistenceManagerImpl#updateCheckpointData(com.ibm.ws.batch.container.checkpoint.CheckpointDataKey, com.ibm.ws.batch.container.checkpoint.CheckpointData)