Tenner Grid is a Mathematical puzzle that consists of a rectangular grid of width ten cells. The task is to fill in the grid so that each row contains the numbers 0 to 9. Numbers must not be repeated in rows. In columns the numbers may be repeated and the numbers in a column must add up to a given target sum. Therefore, the bottom numbers give the sum of the numbers in column. The digits in contiguous cells (even diagonally contiguous cells) must be different.

The rules of Tenner Grids math puzzles:

1. Numbers appear only once in a row.

2. Numbers may be repeated in columns.

3. Numbers in the columns must add up to the given sums.

4. Numbers in connecting cells must be different.

Write an AI program to generate and solve the game Tenner Grid by modelling it as constraint satisfaction problem.

source code must be in java