@ tefigel

|--
|   Return comma-separated list of identifiers from the given list,
|   or from the JAVA_PROPERTIES list (default).
|--
interface(LIST_ID)

if LIST_ID=
   set LIST_ID=JAVA_PROPERTIES
endif

new_list(PROP_LIST)
for JPROP=~list_contents(LIST_ID)
   add_item(PROP_LIST,~java/property_type(JPROP) ~java/property_id(JPROP))
endfor

escape \
set P_LIST=~list_contents(PROP_LIST,,,\, )
escape

delete_list(PROP_LIST)
retvalue=P_LIST