hmm have just googled and apparently the plants often take up to 10 years to bear fruit so may try growing as a houseplant. Also just read this which made me smile!!
An old gardeners trick in the southern hemisphere to encourage the plant to flower is to treat the tree roughly. When it is of a decent size, (no smaller than 1.5m), attack the trunk of the tree with a knife, or sharp implement. Make sure you dont damage the tree so it cant grow properly, and only cut the surface of the bark never make big cuts in it. The stress brought on by this attack is said to shock the plant into flower, where it will then hopefully bear fruit.