Opencv 2.4.7. java build on CentOS 6 java module is unavailable.

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Hi, I try to build OpenCV on CentOS 6. My problem is that java module is unavailable.

--   OpenCV modules:
--     To be built:                 core flann imgproc highgui features2d calib3d ml video legacy objdetect photo gpu ocl nonfree contrib stitching superres ts videostab
--     Disabled:                    world
--     Disabled by dependency:      -
--     Unavailable:                 androidcamera java python


--   Java:
--     ant:                         /usr/bin/ant (ver 1.7.0)
--     JNI:                         /usr/lib/jvm/java-1.6.0-openjdk.x86_64/include /usr/lib/jvm/java-1.6.0-openjdk.x86_64/include/linux /usr/lib/jvm/java-1.6.0-openjdk.x86_64/include
--     Java tests:                  NO

Thanks, Any ideas appreciated