Preselection of component and subcomponent is based on mapping issues with cvs
logs. It has few problems.
1)The major problems is when the class from stacktrace is not available in
NetBeans cvs. For example ruby support.
2) Mining mapping from cvs history is not done every day.
1) Try use mapping from exceptions database to issuezilla issue.
2) When no mapping still exists try now to use mapping cvs logs with issuezilla.
components and subcoponents mapping was already improved by sourcejar mapping covering this problem.