I want to configure my LDAP with activiti explorer so I have followed the instructions from the user guide and i created activiti-custom-context.xml file and I did what he said but it didn't work for me and give me this error
03:33:38,967 [localhost-startStop-1] ERROR org.activiti.engine.impl.interceptor.CommandContext - Error while closing command context org.activiti.engine.ActivitiIllegalArgumentException: This query is not supported by the LDAPGroupManager
Check the LDAP logs for your installation, in order to determine if the system is even connecting to LDAP. And then I would verify the search base and see if you can snag the user query that the system is actually making - in the same logs. Finally, take that query and attempt running it in an LDAP Browser, such as 'Apache Directory Studio' or whatever open source browser fits your fancy and try the query from there.
Most likely, there is a problem in the configuration of your LDAP settings.