There is no credible evidence that the apostle James ever visited Ireland. According to Acts 12:1-22, James was beheaded in Jerusalem by Herod Agrippa, with no indication that he had traveled. Acts does include passages about other apostles' travels--most notably Paul, but also Philip in Samaria and Peter in Caesarea.
The fourth century church historian Eusebius mentions the early Christians' travels in spreading the gospel to Palestine and Antioch, Rome, and Egypt. Within the same chapter Eusebius mentions James' death in Jerusalem without suggesting that James had traveled.
Much later, a legend arose that James had gone to Spain to preach the gospel before returning to Jerusalem to be martyred. And even later--in the 17th century--Spanish chronicler Joseph Pellicer wrote that James had also spent time in Ireland.