Could you post the stack trace. Armin ----- Original Message ----- From: "Ujwal Oswal" <[EMAIL PROTECTED]> To: "'OJB Users List'" <[EMAIL PROTECTED]> Sent: Monday, September 09, 2002 5:49 PM Subject: RE: OJB- ODMG Help
> My Null Pointer exception is gone after I commented all the AWT code. > The new problem I am having is It says "File not found" when I execute the > query. > > How do I check what query is being fired. > > tks > ujwal > > > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] > Sent: Monday, September 09, 2002 11:02 AM > To: OJB Users List > Subject: Re: OJB- ODMG Help > > > Everything seems OK. > Try: Open a new database on every method call and close it after use. > See below. > This 'strange' behaviour (Charles explain) will be fixed with the next > version of OJB. > > regards, > Armin > > > [org.apache.ojb.odmg.TransactionImpl] WARN: TransactionImpl created > with > > null DatabaseImpl. > > Transaction found no opened database. > > > public class TestOdmg extends Frame implements ActionListener > > { > > private Implementation odmg = null; > > private Vector useCases; > > private static String databaseName; > > private TextArea textarea; > > private Button exit; > > private MenuBar menubar = null; > > private Menu menu = null; > > private MenuItem newUser = null; > > private MenuItem showUser = null; > > private MenuItem exitApp = null; > > > > static > > { > > try > > { > > databaseName = > > ((PersistenceBrokerConfiguration) > PersistenceBrokerFactory > > .getConfigurator() > > .getConfigurationFor(null)) > > .getRepositoryFilename(); > > } > > catch (ConfigurationException e) > > { > > databaseName = "repository.xml"; > > } > > > > } > > > > public TestOdmg() > > { > > textarea = new TextArea(); > > exit = new Button ("Exit"); > > exit.addActionListener(this); > > menubar = new MenuBar(); > > menu = new Menu("User"); > > newUser = new MenuItem ("New User"); > > newUser.addActionListener(this); > > showUser = new MenuItem ("Show User"); > > showUser.addActionListener(this); > > exitApp = new MenuItem ("Exit"); > > exitApp.addActionListener(this); > > > > odmg = OJB.getInstance(); > > Database db = odmg.newDatabase(); > > file://open database > > try > > { > > db.open(databaseName, Database.OPEN_READ_WRITE); > > } > > catch (ODMGException ex) > > { > > ex.printStackTrace(); > > } > > > > menu.add(newUser); > > menu.add(showUser); > > menu.add(exitApp); > > menubar.add(menu); > > setMenuBar(menubar); > > add(textarea,"Center"); > > add(exit, "South"); > > > > setSize(400,400); > > this.show(); > > } > > > > public static void main(String[] args) > > { > > TestOdmg app = new TestOdmg(); > > } > > > > private void showUsers() > > { > > User user = null; > > System.out.println("Now Running @@@@@@@@@@@"); > > int total = 0; > > > > try > > { > // open new DB > #### Database db = odmg.newDatabase(); > db.open(...); > > // 1. open a transaction > > Transaction tx = odmg.newTransaction(); > > tx.begin(); > > > > // 2. get an OQLQuery object from the ODMG facade > > OQLQuery query = odmg.newOQLQuery(); > > > > // 3. set the OQL select statement > > query.create("select allusers from " + > User.class.getName()); > > > > // 4. perform the query and store the result in a > persistent > > Collection > > DList allUsers = (DList) query.execute(); > > tx.commit(); > > > > // 5. now iterate over the result to print each product > > java.util.Iterator iter = allUsers.iterator(); > > > > while (iter.hasNext()) > > { > > total++; > > user = (User) iter.next(); > > textarea.appendText("User Id : "+user.getUserId()+ " > User > > Name "+ user.getUserName ()); > > textarea.append("\n"); > > } > > > > textarea.appendText("Total Users : "+ total); > > } > > catch (Throwable t) > > { > > t.printStackTrace(); > > } > finally > { > // close on every call > ### db.close(); > } > > > } > > > > public void actionPerformed (ActionEvent ae) { > > if (ae.getSource() instanceof Button) { > > System.exit(0);; > > } > > else if (ae.getSource() instanceof MenuItem) { > > if ("New User".equals(ae.getActionCommand())) { > > System.out.println ("New User"); > > // AddUser adduser = new AddUser(this,broker); > > // adduser.show(); > > } > > else if ("Show User".equals(ae.getActionCommand())) > > { > > showUsers(); > > } > > else if ("Exit".equals(ae.getActionCommand())) { > > System.exit(0);; > > } > > } > > } > > } > > > > Ujwal > > > > > > > -- > To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> > For additional commands, e-mail: <mailto:[EMAIL PROTECTED]> > -- To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> For additional commands, e-mail: <mailto:[EMAIL PROTECTED]>
