BD-J (or BD Java) is the name given to the Java-based software that will be included onBD-ROM discs and allBlu-Ray Disc players. This will help provide the Blu-ray menus and many other features. On DVDs, menu's are made up of segments ofMPEG video, or still frames. BD-J and the interactivity layer used byHD DVD,iHD, are far more advanced and will offer greater features thanDVD. The Blu-ray group is using a specification from Europe calledJEM.

The rivals of Blu-ray Disc have attacked the groups use of JEM for interactivity features because the specification has a very high number of instructions that will apparently make it very tough for manufacturers to ensure that all devices will function properly.HP urged theBlu-ray Disc Association to rethink the use of Java and consider using the DHTML based iHD instead. This would make it cheaper for PC manufacturers as iHD is an integral part ofMicrosoft's upcomingWindows Vista operating system.

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