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Code Block
titleLoginControler processFormSubmission excerpt
  protected ModelAndView processFormSubmission(final HttpServletRequest request, final HttpServletResponse response, final Object object,
        final BindException errors) throws Exception {
        final Credentials credentials = (Credentials)object;
        
        this.credentialsBinder.bind(request, credentials);

        final String ticketGrantingTicketId = this.centralAuthenticationService.createTicketGrantingTicket(credentials);

Panel
bgColor#FFFFCE
titleWhere is the object coming from?
borderStylesolid

We need to look carefully at the "object" argument. The object here is a Command. LoginController extends SimpleFormController which extends AbstractFormController which extends BaseCommandController.

LoginController defaults this Command class:

Code Block
titleLoginController afterPropertiesSet() excerpt
  public void afterPropertiesSet() throws Exception {

        if (this.getCommandClass() == null) {
            this.setCommandName("credentials");
            this.setCommandClass(UsernamePasswordCredentials.class);

In BaseCommandController, we have:

Code Block
titleBaseCommandController getCommand()
/**
 * Retrieve a command object for the given request.
 * <p>Default implementation calls createCommand. Subclasses can override this.
 * @param request current HTTP request
 * @return object command to bind onto
 * @see #createCommand
 */
 protected Object getCommand(HttpServletRequest request) throws Exception {
    return createCommand();
 }

And the createCommand() method to which it delegates:

Code Block
titleBaseCommandController createCommand()
/**
 * Create a new command instance for the command class of this controller.
 * @return the new command instance
 * @throws InstantiationException if the command class could not be instantiated
 * @throws IllegalAccessException if the class or its constructor is not accessible
 */
 protected final Object createCommand() throws InstantiationException, IllegalAccessException {
    if (this.commandClass == null) {
         throw new IllegalStateException("Cannot create command without commandClass being set - " +
            "either set commandClass or override formBackingObject");
    }
    if (logger.isDebugEnabled()) {
        logger.debug("Creating new command of class [" + this.commandClass.getName() + "]");
    }
    return this.commandClass.newInstance();
 }

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