While John Travolta is in the film, he doesn't play a poor man in a ghetto. The plot revolves around Schwarzenegger's character, Adam Gibson, who is a pilot and discovers he's been cloned.
The film touches on themes of social class and genetic engineering, but it's not about a white man living in a predominantly black wealthy neighborhood.
It's possible you're misremembering some details of the film or another movie altogether. Can you tell me more about what you remember about the movie? This will help me pinpoint the correct film.