ApacheDS not able to restart/start when the process shown in apacheds-default.pid is not running

I have a default instance of ApacheDS 2.0.0.M11.

I could not restart the apacheDS service using

/etc/init.d/apacheds-2.0.0-M11-default restart or /etc/init.d/apacheds-2.0.0-M11-default start

after a system reboot.

The problem is fixed by deleting the pid stored in the apacheds-default.pid file /var/lib/apacheds-2.0.0-M11/default/run/apacheds-default.pid