Implement 2/2 transactions with multiple signatures with bitcoinj

I use bitcoinj to implement a 2/2 transaction with multiple signatures. Now I want to use bitcoinj to generate a 2/2 address with multiple signatures and the associated redemption script over the public keys of the two parties and to perform sequential signatures between the two parties. I did not find a similar example in the description document of bitcoinj. Can you give me a concrete implementation?