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The same thing happened to me and I had to restart my server. I changed it so it would force me into creative and I could fly over to the starting area and then I set the /jspawn. I then logged out stopped the server changed the gamemode and restartd the game and relogged in and started to play.
I believe that you need at least 12 or 16 villagers to spawn a golem so give it some time. He will spawn in the middle based on the door locations. 40 doors or 48? I think it requires 48 to work with out bringing in all the villagers.