[Copied this over from http://jira.codehaus.org/browse/JRUBY-3603 ]. There is also a patch against JRuby (which will not apply against this project, but it is easy to adapt).

The implementation of addComment on Node class results in adding the comment to a shared static list. The shared static list is meant to be an untouchable empty list shared across all nodes not containing comments (99.9% of them) I'm assuming for memory reasons. The issue is that the addComment implementation checks the ISourcePosition's comment list for null, not against this shared empty list as well, so comments are getting added to this globally shared list and then all nodes that were supposed to have no comments have the same comments.

Attached is the simple fix: check the local comment list for null and against the global empty list. If either, then lazily generate a new list for this node and it's potion and then add the comments to it.