We did it like this:

- name: Check for previous running Wildfly instances
  shell: ps -ef | grep jboss | grep java | grep -v activemq | grep -v 
/bin/sh | grep -v grep | awk '{print $2}'
  register: ps_result

- debug: msg="{{ps_result.stdout}}"
- debug: msg="{{ps_result.stderr}}"


We are also running activemq which uses java processes, so we have to 
exclude that from our grep results.

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