Bibliography is nothing more than a sample database included with LO. It has one table with about 20 sample records. There are no Forms, Queries or Reports associated with it. So no, there is no grouping - just flat records.
Importing information into Base is not a simple built in function. It is dependent upon the source and may require macro coding.
As far as Java goes, you need to install either JRE or JDK 32-bit or 64-bit depending upon your operating system and LibreOffice installation. See my answer in this post (click here) for help in determination. Here is the Oracle site for the Java downloads: click here.