When will my plum tree have fruit?

Hi, I live on southern Vancouver Island, near Victoria, and I planted a Santa Rosa plum tree in my garden about 7 years ago, it was a bare root tree I bought locally. Every year it has new growth (green shoots) on it which turn to small blossom - but no fruit! I haven't fertilized it before, and this year for the first time I sprayed it with dormant spray. I just have the one tree, it's about 5 foot tall now, do I need to plant another plum tree nearby for cross pollination? I would appreciate your feedback.

 

In addition to it being a less well adapted Japanese plum cultivar it is probably also suffering from lack of cross pollination.

Beauty—Ripe mid July to early August. Red
skin, yellow flesh, fruit medium size, ripens
over 2-week period. Very juicy and a good
substitute for Santa Rosa which usually does
poorly in western Washington

http://cru.cahe.wsu.edu/CEPublications/eb0937/eb0937.pdf