## SignInSession.java

    @SpringBean(name = "authorizedRolesDao")
    private AuthorizedRolesDao dao;

   public final boolean authenticate(final String username, final String password) {
        if (user == null || password == null) {

            AuthorizedRoles authorizedroles = new AuthorizedRoles();
            authorizedroles = dao.retrieve("bla", "bla");


## IbatisAuthorizedRolesDao.java

public class IbatisAuthorizedRolesDao extends SqlMapClientDaoSupport implements AuthorizedRolesDao {

    public AuthorizedRoles retrieve(String username, String password) throws DataAccessException {

        Map<String, Serializable> map = new HashMap<String, Serializable>();
        map.put("vchar_username", username);
        map.put("vchar_password", password);

        AuthorizedRoles authorizedroles = (AuthorizedRoles) getSqlMapClientTemplate().queryForObject("pRetrieveAuthorizedRoles", map);

        return authorizedroles;
    }
}


## Error

2007-05-21 14:00:15,524 ERROR org.apache.wicket.RequestCycle - Method onFormSubmitted of interface org.apache.wicket.markup.html.form.IFormSubmitListener targeted at component [MarkupContainer [Component id = signInForm, page = wicket.contrib.phonebook.web.page.SignIn, path = 0:signInPanel:signInForm.SignInPanel$SignInForm, isVisible = true, isVersioned = true]] threw an exception
org.apache.wicket.WicketRuntimeException: Method onFormSubmitted of interface org.apache.wicket.markup.html.form.IFormSubmitListener targeted at component [MarkupContainer [Component id = signInForm, page = wicket.contrib.phonebook.web.page.SignIn, path = 0:signInPanel:signInForm.SignInPanel$SignInForm, isVisible = true, isVersioned = true]] threw an exception
	at org.apache.wicket.RequestListenerInterface.invoke(RequestListenerInterface.java:197)
	at org.apache.wicket.request.target.component.listener.ListenerInterfaceRequestTarget.processEvents(ListenerInterfaceRequestTarget.java:73)
	at org.apache.wicket.request.AbstractRequestCycleProcessor.processEvents(AbstractRequestCycleProcessor.java:90)
	at org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:1005)
	at org.apache.wicket.RequestCycle.step(RequestCycle.java:1073)
	at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1142)
	at org.apache.wicket.RequestCycle.request(RequestCycle.java:490)
	at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:248)
	at org.apache.wicket.protocol.http.WicketServlet.doPost(WicketServlet.java:144)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
	at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:445)
	at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:356)
	at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:226)
	at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:627)
	at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:141)
	at org.mortbay.jetty.Server.handle(Server.java:269)
	at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:430)
	at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:701)
	at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:617)
	at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:199)
	at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:339)
	at org.mortbay.jetty.bio.SocketConnector$Connection.run(SocketConnector.java:208)
	at org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:475)
Caused by: java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:585)
	at org.apache.wicket.RequestListenerInterface.invoke(RequestListenerInterface.java:186)
	... 23 more
Caused by: java.lang.NullPointerException
	at wicket.contrib.phonebook.web.SignInSession.authenticate(SignInSession.java:61)
	at wicket.contrib.phonebook.web.page.SignIn$1.signIn(SignIn.java:28)
	at wicket.contrib.phonebook.web.page.SignInPanel$SignInForm.onSubmit(SignInPanel.java:79)
	at org.apache.wicket.markup.html.form.Form.delegateSubmit(Form.java:683)
	at org.apache.wicket.markup.html.form.Form.onFormSubmitted(Form.java:379)
	... 28 more