Thank you for the quick reply.
I have tried the below process, to rebuild dspace, but still i do not see any change in the way logs are displayed.
Since everyone follows this similar process. May be there is something else that i am not doing right.
May i please confirm if i am making changes to the right source file : that the changes that we make for the dspace ldap authentication source file - is within this particular directory tree structure : dspace-1.8.2/dspace-api/src/main/java/org/dspace/authenticate/ ?