To fix this issue, please follow the below steps:

• Stop the opennms service from the WebUI using the article How to disable OpenNMS on Junos Space
• Check if there is any OpenNMS stale process running by using the below command:

ps -ef | grep -i opennms

•  If there is any process, kill them by using the below command: 

kill -9 <process ID>

For example:

[root@space-005056a9ab86 ~]# ps -ef | grep -i opennms

opennms  13311     1  0 Dec22 ?        00:00:00 /bin/bash /opt/opennms/opennms.init start

kill -9 13311