Help Needed from Steve Muench

Question

Dear Steve,
I am following the toystore demo. From the toystore demo, I have included a package, FwkExtensions. Now I wan't to write my own user validation. I have followed the way you have coded for your signin actions. From the login form whenever some one insert his login and password, I get it in ValidateUserAction.java, where the onValidateUser( ) is like:
public void onValidateUser(DataActionContext ctx)
HttpServletRequest request = ctx.getHttpServletRequest();
String target = request.getParameter("target");
if (isNullOrEmpty(target)) {
target = "welcome";
LoginForm loginForm = (LoginForm) ctx.getActionForm();
final String login = loginForm.getLogin();
final String password = loginForm.getPassword();
if (isNullOrEmpty(login)) {
ctx.getActionErrors().add("username", new ActionError(BLANKLOGIN));
else if (isNullOrEmpty(password)) {
ctx.getActionErrors().add("password", new ActionError(BLANKPASSWORD));
else
LoginService ls = getLoginService(ctx);
//Error Starts from the lower part
if (ls.validateUser(login, password))
AppUserInfo.signIn(request, loginForm.getLogin());
ctx.setActionForward(target);
return;
else
ctx.getActionErrors().add(ActionErrors.GLOBAL_ERROR,
new ActionError(INVALIDLOGIN));
saveErrors(ctx);
My DataForwardActionClass is shown below:
package neplogin.view;
import toystore.fwk.controller.ToyStoreDataForwardAction;
import java.text.*;
import java.util.*;
import oracle.adf.controller.struts.actions.DataActionContext;
import neplogin.service.common.LoginService;
public class LoginServiceDataForwardAction extends ToyStoreDataForwardAction
private static final String DATACONTROLNAME = "LoginService";
public LoginServiceDataForwardAction()
* Return the LoginAppModule custom interface that clients
* (like the data actions in this project) can use to invoke
* server-side business logic in a tier-independent way.
* @param ctx The DataAction context
* @return The LoginAppModule custom service interface
protected LoginService getLoginService(DataActionContext ctx) {
System.out.println("-------------- Login App Module Created Successfully ---------------");
return (LoginService) getApplicationModule(DATACONTROLNAME, ctx);
* Mark the LoginService data control to be released in stateless mode
* at the end of the request.
* @param ctx The DataAction context
protected void releaseLoginServiceStateless(DataActionContext ctx) {
releaseDataControlStateless(DATACONTROLNAME, ctx);
Whenever I call the method validateUser(login,password) I get Null Pointer Exception. Which implies that my LoginService (ApplicationModule) can't be instantiated. How to instantiate LoginService and how? I couldn't figure it out till now.
I am using JDeveloper 10.1.2, Default Web Application Framework, contains JSP, Strut and ADF.
Thanks in advance

Answer 1

Hi Guys,
A few more notes: The error messages are like:
INFO: Initializing, config='org.apache.struts.taglib.html.LocalStrings', returnNull=true
05/08/24 12:34:37 -------------- Login App Module Created Successfully ---------------
05/08/24 12:34:37 Login Name = admin
05/08/24 12:34:37 Password is = himu
05/08/24 12:34:37 java.lang.NullPointerException
05/08/24 12:34:37      at neplogin.view.ValidateUserAction.onValidateUser(ValidateUserAction.java:71)
05/08/24 12:34:37      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
05/08/24 12:34:37      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java)
05/08/24 12:34:37      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
05/08/24 12:34:37      at java.lang.reflect.Method.invoke(Method.java)
05/08/24 12:34:37      at oracle.adf.controller.lifecycle.PageLifecycle.handleEvent(PageLifecycle.java:544)
05/08/24 12:34:37      at oracle.adf.controller.struts.actions.StrutsPageLifecycle.handleEvent(StrutsPageLifecycle.java:252)
05/08/24 12:34:37      at oracle.adf.controller.lifecycle.PageLifecycle.processComponentEvents(PageLifecycle.java:477)
05/08/24 12:34:37      at oracle.adf.controller.struts.actions.DataAction.processComponentEvents(DataAction.java:236)
05/08/24 12:34:37      at oracle.adf.controller.struts.actions.DataAction.processComponentEvents(DataAction.java:430)
05/08/24 12:34:37      at oracle.adf.controller.lifecycle.PageLifecycle.handleLifecycle(PageLifecycle.java:126)
05/08/24 12:34:37      at oracle.adf.controller.struts.actions.DataAction.handleLifecycle(DataAction.java:223)
05/08/24 12:34:37      at toystore.fwk.controller.ToyStoreDataForwardAction.handleLifecycle(ToyStoreDataForwardAction.java:189)
05/08/24 12:34:37      at oracle.adf.controller.struts.actions.DataAction.execute(DataAction.java:155)