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Ok, below I present solution of my problem:

Mat m1 = Mat.zeros(3, 3, CvType.CV_32F);

Mat m2 = Mat.ones(3, 3, CvType.CV_32F);

Mat m3 = Mat.ones(3, 3, CvType.CV_32F);

Core.gemm(m2, m3, 1, new Mat(), 0, m1, 0);

My problem was connected with wrong type used in declaration of matrices and to multiply them we can use gemm function as it is presented above.

Thanks for help:)