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it is true, that you cannot use SIFT or SURF from java atm. (patent reasons)

on the other hand, there's more than FAST, have a look here:

Detectors:

    FAST          = 1,
    ORB           = 5,
    MSER          = 6,
    GFTT          = 7,
    HARRIS        = 8,
    SIMPLEBLOB    = 9,
    BRISK         = 11,
    AKAZE         = 12,

Descriptors:

    ORB   = 3,
    BRISK = 5,
    AKAZE = 7,