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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:

  public void afterPropertiesSet() throws Exception {

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

In BaseCommandController, we have:

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