Don't confuse java and javascript.
Java is a separate major programming language while javascript is an object-oriented scripting language which you write directly into your html code.
You do not need java to support javascript. They sound alike and are often confused, but they are unrelated.
Javascript is widely used for all sorts of things including google tracking, adding tool tips, etc. You definitely want that support.
java is more comparable to php and the chances are you will want to use php for programming when you decide to get into that. php is open source, widely supported, designed directly for web use rather than offline programming, and used for a lot of major online tools like Wordpress. It is unlikely you will ever need to do programming for the web you cannot do with php although there are several other popular languages including java.
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