* @throws IllegalArgumentException when {@link ConnectionSettings} cannot
* create a writable {@link Client}
*/
@Override
public Producer createProducer() throws Exception {
Command cmd;
if (BeanstalkComponent.COMMAND_PUT.equals(command)) {
cmd = new PutCommand(this);
} else if (BeanstalkComponent.COMMAND_RELEASE.equals(command)) {
cmd = new ReleaseCommand(this);
} else if (BeanstalkComponent.COMMAND_BURY.equals(command)) {