@Override public boolean borrow(BookPOJO book, UserPOJO user) { try { if (bTable.hasAlreadyBorrowed(book, user)) return false; // Book is not available. Add in queue if not if (!isAvailable(book)) { if (!bTable.isAlreadyInQueue(book, user)) addToQueue(user, book); return false; } return bTable.borrow(book, user); } catch (SQLException e) { Logger.getLogger(EmbeddedDB.class.getName()).log(Level.SEVERE, e.getMessage(), e); } return false; }