There is very little evidence (online) that James Shea ever existed, but at least there is evidence. I located three document(ation)s that provide information on
New South Wales, Australia, Assisted Immigrant Passenger Lists, 1828-1896
Name: Bartholomew Shea
Birth Year: abt 1827
Arrival Date: 19 May 1855
Vessel Name: Matoaka
Origin Location: Lattra, County Tipperary, Ireland
This document also says that Bartholomew, was born in Drumcliff, County Clare, Ireland. He was working the voyage as a shipman. He had a sister named XXXXX XXXXXving in Sydney. His father was dead and his mother was living in Drumcliff.
Griffith's Valuation of Ireland - Drumcliff, Clare County
There are four people listed with the surname Shae;
Anne Clonroad More
John Clonroad Beg Town of Ennis Turnpike Road
Mary Clonroad Beg Town of Ennis Turnpike Road
Michael Clonroad Beg Town of Ennis Market Place
We find Bartholomew's mother, Mary Shae, living in Drumcliff, Clare County, Ireland in 1855 with John. He is probably a relative. He could be her son or he could be James' father, her father-in-law.
Ireland, Births and Baptisms, 1620-1911
Name: James Shea
Baptism Date: 1 Jan 1801
Baptism Place: Roman Catholic, Killarney, Kerry, Ireland
Father's Name: John Shea
Mother's Name: Nora Coggin
FHL Film Number: 823809
This is the only record for birth I located for a James Shea that would fit the years to be Bartholomew's father. Considering the Penal Laws and the fire at the Public
Records Office, you are very fortunate to have this information, without having to travel to Ireland. However, this is not enough proof if you want to proliferate or publish the information. If that is your intent, I suggest you hire a researcher in Ireland who can do onsite research for you.