Puppy jumps up on people and nips.

Practice with another person...one person keeps the puppy on  a lead, the other person approaches the puppy over and over again with varying levels of enthusiasm. If the puppy keeps all 4 paws on the ground, he gets petted (and every now and again a treat). If the puppy jumps or lunges forward, the person approaching turns their back and walks away. Do this for 10 mins each day. Switch who's holding and who's approaching.

You can try doing this on your own, with the puppy tethed to something, but it's not as effective.

Good luck!

IGNORE him.  If he jumps, say nothing, do nothing, make no eye contact with him, disappear into a bathroom if you have to.  If he NEVER gets any attention for jumping or nipping, he will eventually stop.  If he sits nicely, he gets a Cheerio or a pat.  Keep rewarding the good behavior and ignoring the other.
Have you signed up for classes yet?????? A Rottweiler is not the dog you want to make mistakes with.

Yeah we been taking classes.He is passing everything exept this part for some odd reason

When he nips, squeak Ouch! really loudly and disappear for a few minutes.

As for the jumping, there are three methods that work beautifully for me:

A)THE TABLE TECHINIQUE- Get a pause table (or anything the dog can stand on all fours thats close to the ground). Lead the dog up and have him sit or stand, whichever you prefer, but if this dog does agility w/ pause tables, you wouldn't want to confuse it and tell it to down when trained to sit. Give your dog the release word (if you ave one, like "ok!" or "done!") and tell him to "Off!" and lead him down. Do a jackpot reward and give about 5 treats in row. Keep gradually reducing treats until he Offs exceptionally well w/o leading.

B) THE NILIF JUMPERS TECHIQUE- This is the same technique the geekygurl wrote. Except I just walk back, and then approach 10 seconds later.

C) ON/OFF SWITCH TECHNIQUE-I like an on/off switch for my dogs. This is how I taght my Belgian Malinois not to jump. Have your dog sit in front of you with a leash dangling down. Entice your dog to jump on you. Gently knee your dog in the chest (gently meaning next to no force used) and tell him to off. If he doesn't, step lightly on the dangling leash. Teach to jumpn switch Teach to get offff switch. Similar methods work for jumping on the counters and couch.

IGNORE him. If he jumps, say nothing, do nothing, make no eye contact with him, disappear into a bathroom if you have to. If he NEVER gets any attention for jumping or nipping, he will eventually stop. If he sits nicely, he gets a Cheerio or a pat. Keep rewarding the good behavior and ignoring the other.

 
That is exactly what my coursework taught me.  And, it makes sense because that is exactly how I dealt with toddler behavior as well.  Works for kids like a charm! []

Yeah we been taking classes.He is passing everything exept this part for some odd reason

 
The reason is probably that he is still intermittenly receiving reinforcement for jumping - this is the same principle that keeps people sitting at the slot machines even if they lose 19 times out of 20. [] Even if you are doing a great job ignoring him every time he jumps, maybe he tries jumping on someone else and they instinctively pat his head or cry out - either reaction can be seen as reinforcement to the dog. That's why you need to enlist cooperation from friends and family....

ORIGINAL: jones

Yeah we been taking classes.He is passing everything exept this part for some odd reason

The reason is probably that he is still intermittenly receiving reinforcement for jumping - this is the same principle that keeps people sitting at the slot machines even if they lose 19 times out of 20. [] Even if you are doing a great job ignoring him every time he jumps, maybe he tries jumping on someone else and they instinctively pat his head or cry out - either reaction can be seen as reinforcement to the dog. That's why you need to enlist cooperation from friends and family....

Ditto to what's being said here.  When I trained my Mom's shih tzu, I couldn't get her to stop jumping up on people.  The reason being others (not myself) were awarding her with attention for it (a pat on the head, pushing her off, telling her how cute, or even telling her no).  Didn't matter if the attention was negative or positive, it was STILL attention.  In my opinion you need to elicit your friends and family in this endeavor.  If the dog jumps, walk away.  Don't say anything, don't do anything to the pup, ignore the behavior.  It may get a little worse before it gets better (think  atoddler screaming for attentiion, not getting it, then having a full out tantrum...still not getting attention, finally stops and realizes this behavior is getting him nowhere). 

Try this:  each time he does it, fold your arms, turn your body away slightly and look at the ceiling.  For some reason, this seems to stop a lot of young puppies in their tracks, it's almost like they understand you are saying to them "You're going too far now, cool it"
 
Don't make the mistake of petting him the MOMENT all four feet are on the floor.  He's still in a highly reactive state, so wait for him to be visibly calm and relaxed and then quietly CALL him over.  Then it will be much easier for him to stay calm as you pet him - it will also be easier for him to respond to a Sit first, which is good practise.  It also makes sure that you are not only reinforcing the correct behaviour, but also the correct mind state - and lets face it, the being calm is more important than the sitting part.  It's very easy to deal with a calm dog who doesn't even know the word Sit, it is very difficult to deal with a hyper dog who understands"sit" plus about a dozen other words.  I do believe that good training is less about teaching the dog to do as he is told than helping him to behave in the correct way without HAVING to be told (if that makes sense)

You'd better get that under control ASAP.  With the size of dog that yours will become it could be a major problem in the near future.  Get off of the chat/ forums and get some professional help if you're not able to show signs of improvement immediatly.  Spend some serious qualtiy time with the dog training.  Good luck.