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This exercise is already available in your IntelliJ as a project. What you need to do is described in the comments at the top of the file in src/main/java/.

package basics;

public class Convolution {

    /**
     *
     * @param input is a n1 x m1 non-null rectangular matrix with at least 3 rows and 3 cols
     * @param kernel is a 3 x 3 square matrix
     * @return a matrix M with dimension (n1-2) x (m1-2) with
     *         M[i][j] = sum_{k in 0..2, l in 0..2} input[i+k][j+l]*kernel[k][l]
     */
    public static int [][] convolution(int [][] input, int [][] kernel) {
         return null;
    }
}