Before posting a question, you should read the vSphere API and SDK FAQ here. The page has include 70+ questions and trustable answers in 6 different categories.
When you don't have find the answer there, please check the VI Java API forum. Note that other forums are not used often. The forum has more than 2,000 messages (questions and answers) and keeps growing, you may get what you want by a search first. If there is nothing close, then post your questions. The community will help you there.