Many people certainly think so; it's a common preparation technique. By policy, here on SA, we need to answer you with the advice of the relevant healthcare authorities, which is: no, it is not adequate, particularly if your post-fill processing time is less than 10 minutes.
Here's their reasoning: one of the things you're trying to eliminate is not just bacteria, but bacterial spores, some of which can survive several minutes at boiling temperatures. While dumping boiling jam into a jar does kill any live bacteria, it isn't hot enough for long enough to kill all spores, and if you're doing boiling jam you're probably only putting it in a hot water bath for a couple of minutes (if at all). It also matters whether the jars are new or are being re-used, and how recently they were washed.
Canning foods is a game of risks, and you decide which risks you (and your friends and family) can tolerate.