Subclipse can use either JavaHL or SVNKit. When using Subclipse with SVNKit, users credentials are stored for the duration of the Eclipse session (assuming credentials are not permanently stored).
However, Subclipse+JavaHL does not store the credentials at all - they have to be entered every time. This is quite annoying; it would be a lot easier if JavaHL behaved like SVNKit in this regard. Is this an enhancement that is already planned for JavaHL? If not, could it please be added to JavaHL?