Grammar description for language Java

I'm writing a bachelor's thesis on "Analysis of the source code in Java applications". I have a few points that must include written part. One of them is "a brief description of the grammar and writing Java." Since this is a bachelor thesis, sources of information must be verified - the books, the official site of Java, etc. Unfortunately I can not find this information on the Java website (maybe I'm just casually looking for). If possible, it is easier for me to use online resources than books. Can anyone advise me where I found this information verified? Of course we were in school in certain subjects taught either syntax or semantics of Java, but it does not seem so "official source". Thank you all.