Jacobs, owner of a farm, entered into a contract with Earl Walker in which Walker agreed to paint the buildings on the farm. As authorized by Jacobs, Walker acquired the paint from Jones with the bill to be sent to Jacobs. Before the work was completed, however, Jacobs without good cause ordered Walker to stop. Walker made offers to complete the job, but Jacobs declined to permit Walker to fulfill his contract. Jacobs refused to pay Jones for the paint Walker had acquired for the job. Explain whether Jones and Walker would be successful in an action against Jacobs for breach of contract.