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Re: ozone &servlets
On Tue, 27 Feb 2001, Charilaos Pasantonopoulos wrote:
> Hello,
>
> I tried turning the tutorial example to a servlet. I use Tomcat,
> I added the ozoneEnv in the tomcat startup script and everything should
> be fine
> but, when I run the servlet the connection is opened and closed ok but
> the
> create , print and delete does not work.
> In a new Db (ozoneInst)
> the create Car throws Exception Error: CarImpl_Proxy
do you have a (server and/or client) stacktrace of this exception?
Falko
> the print Error:null and
> the Delete Error:null.
> the second time the servlet is called
> the create throws Error:Root object name 'my_first_car' already exists
> ????
> the print Error:CarImpl_Proxy and
> the delete Error:null.
> It seems to me that ozone can not decide whether it has created the
> object or not,
> if the object is in the Db or not etc.
>
> can anybody understand what is going on ????
>
>
> import org.ozoneDB.*;
> import javax.servlet.*;
> import javax.servlet.http.*;
> import java.io.*;
>
> public class MyApp extends HttpServlet {
>
> private static ExternalDatabase db;
>
> public void doGet( HttpServletRequest req, HttpServletResponse res )
>
> throws ServletException, IOException
> // main( String[] args ) throws Exception
> {
>
> res.setContentType("text/html");
>
> ServletOutputStream out = res.getOutputStream();
>
>
> out.println("<HTML><HEAD><TITLE>TEST</TITLE></HEAD><BODY>Hello</BODY>");
>
> createDb();
>
> createCar();
>
> printCar(out);
>
> deleteCar();
>
>
> closeDb();
>
> }
>
> public static void createDb()
> {
> try{
> // create and open a new database connection
> db = ExternalDatabase.openDatabase(
> "ozonedb:remote://localhost:3333" );
> System.out.println( "Connected ..." );
> System.out.println( "Reloading ..." );
> db.reloadClasses();
> }catch( Exception e)
> {
> System.out.println("Could not open Ozone !!!");
> System.out.println("Error :"+e.getMessage());
> }
> }
>
> public static void createCar() {
> try{
> // create a new Car object with the name "my_first_car"
> // the return value is Car_proxy, which implements the
> Car-interface
> System.out.println( "Create object ..." );
> Car car = (Car)(db.createObject( CarImpl.class.getName(), 0,
> "my_first_car" ));
> System.out.println( "Set values ..." );
> car.setName( "gottfried" );
> car.setYearOfConst( 1957 );
> }catch( Exception e)
> {
> System.out.println("Could not Create Object in Ozone !!");
> System.out.println("Error :"+e.getMessage());
> }
>
>
> }
>
> public static void printCar(ServletOutputStream out) {
> try{
> System.out.println( "Print ..." );
> Car car = (Car)(db.objectForName( "my_first_car" ));
> if (car != null) {
> out.println( "The car " + car.name() + " is "
> + car.age() + " years old." );
> } else {
> out.println( "Object my_first_car not found." );
> }
> }catch( Exception e)
> {
> System.out.println("Can not print !!");
> System.out.println("Error :"+e.getMessage());
> }
> }
>
> public static void deleteCar() {
> try{
> System.out.println( "Delete ..." );
> Car car = (Car)(db.objectForName( "my_first_car" ));
> if (car != null) {
> db.deleteObject( car );
> } else {
> System.out.println( "Object my_first_car not found." );
> }
> }catch( Exception e)
> {
> System.out.println("Could not delete object in Ozone !!");
> System.out.println("Error :"+e.getMessage());
> }
> }
>
> public static void closeDb()
> {
> try{
> System.out.println( "Close ..." );
> db.close();
> }catch( Exception e )
> {
> System.out.println("Could not close Ozone !!");
> System.out.println("Error :"+e.getMessage());
> }
> }
>
> public String getServletInfo() {
> return "Ozone-Servlet test";
> }
>
>
> }
--
______________________________________________________________________
Falko Braeutigam mailto:falko@smb-tec.com
SMB GmbH http://www.smb-tec.com