If you choose not to download with Java (or just forgot about it) you can easily install Java afterwards to get the missing functionality to work. If you have already Java installed there is no need to download the installer with Java. We do recommend you however to have a Java Runtime Environment on your system, and therefore our default installation offerings includes a JRE (which adds about 15MB to the total download size). So what does this imply for me? Base (the database component) relies completely on Java technologies to run, but other programs (like Writer, Calc and Impress) only need Java for special functionality. If you do not require these features, then you do not need to Java installed for running. Furthermore some wizards rely on Java technology. Java is mainly required for the HSQLDB database engine (used by our database product Base) and to make use of accessibility and assistive technologies. Java is required for complete functionality. By default the installer will install this additional piece of software as well. Java Runtime Environment (JRE) (64-Bit) has had 1 updates within the past 6 months. ' The Java Runtime Engine (JRE) is required for the Base ( database) component of as well as several other features. Download Java Runtime Environment (JRE) (64-Bit) for Windows to run Java applications on your Windows computer.