How do I store the row IDs from the columns used to make a view, for possible updates to the rows the view comprises?

I'm using Eclipselink, JAX-RS, and Primefaces. Some of my tables will be joined into Views (or possibly just Joins) that will populate the Primefaces interface for the user. Eventually, I think the user would want to update some of the rows and columns that comprise what the user is seeing.

How and where can the rowIDs be stored? sessionStorage.setItem("foo", "bar"); ? or, maybe there is some JavaEE function that I could use?