Exception in thread & ldquo; Hand & rdquo; Java.lang.NullPointerException (JDBC)


Exception in thread "main" java.lang.NullPointerException at gui.CataloguePanel.(CataloguePanel.java)

I'm trying to initialize a BookQuery object in CataloguePanel and call getBookList()


package gui;

import java.util.ArrayList;

import backend.Book;
import backend.BookQuery;

// Catalog panel. Shows the library titles' information and allows users to place their orders.
public class CataloguePanel extends JPanel implements GBPanel {

    BookQuery bQuery;
    ArrayList<Book> bookList = bQuery.getBookList(); // Here's where the error occurred


EDIT: http://www.reactionface.info/sites/default/files/imagecache/Node_Page/images/1314029819767.png

BookQuery bQuery;
ArrayList<Book> bookList = bQuery.getBookList();

bQuery is not initialized, so it is similer like null.getBookList() which must produce NullPointerException. Either you initialize bQuery. like -

BookQuery bQuery= new BookQuery();

Or make the getBookList() method static and call the method like -

ArrayList<Book> bookList = BookQuery.getBookList();