Dont worry about BD-J, it just a software that will update with firmwares for all Blu-ray players, software players and Playstation 3.
Before Digital Leisure developed Dragon's Lair for Blu-ray, they did not have experience how to programming Java code for BD-J a year ago. They had first Panasonic Blu-ray player, Cyberlink PowerDVD BD player and Blu-ray BD-RE burner for testing running Java code that both did not have fully BD-J compliant but it did worked perfect but also Playstation 3 wasnt available last summer, they were worried it may not worked with it. Then when they bought one last November and tested Dragon's Lair with Playstation 3 and they were relieved it ran and worked perfect.
Digital Leisure found Java very easy to programming than C and C++.
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