This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
You're putting quotes around your parameter which means that instead of the query trying to find the row number where call_no_display = callNumber, it's trying to find a case where call_display equals a string that has a question mark in it.
try this instead:
String getRowNumber = "SELECT row_number FROM call_no_browse WHERE call_no_display = ? ";