CommandLocationBinary allows to lookup a command (on the $PATH, etc.). But it'll only do so once:

	public String findLocation(int timeout) {
		if (foundLoc != null || searchFailed)
			return foundLoc;

		String searched = CommandLocationLookupStrategy.get().search(this, timeout);
		if (searched == null) {
			searchFailed = true;
		}
		foundLoc = searched;
		return searched;
	}

Once the lookup failed, it'll store this in the var searchFailed and wont do it a 2nd time.
What if I update my ex. correct a broken link to oc while I keep Eclipse running?
I'd think that one should be able to repeat the lookup if it fails since the user could modify it's system while he keeps Eclipse running. Afaics the current impl forces me to restart Eclipse.