As Donal Fellows says, if you are writing a web application with Java, you can be interested in using Dojo for it.
Anyway, Java is not the relevant part in the question; the relevant part is that the OP is asking help to start using Dojo ("Can anyone help me starting with Dojo?"). The FAQ has a section about that, where it is clearly stated:
Your questions should be reasonably scoped. If you can imagine an entire book that answers your question, you’re asking too much.
In this case, the question is too generic, and an entire book would answer the question (I can imagine a book titled Dojo for beginners). If the OP had a more specific question, e.g. "How can I accomplish this using Dojo?" that would be fine.
As for the closing reason, the "not a real question" reason says, "This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form."