JPO is a framework for persistence (storage and retrieval) of domain (or data) objects in Java-based database applications. The object/relational impedence missmatch is widely regarded as a complex problem with no easy solution.
Cars changed overtime by people who wanted bigger cars or faster cars. People started to make plans for better cars, tested them and see if they people liked it. Cars are stil â¦ l changing today.
The Automobile Revolution. Americans were well on the way to becoming a motorized society before the 1950s, but the Depression and the halt in auto production during World War II slowed the growth of America's car culture. During the '50s, though, the number of cars in the U.S. nearly doubled from 39 million to 74 million.