kartik hedau

Well, in my opinion, it depends on a particular context. Sometimes I find returning a String is useful, sometimes returning a ModelAndView object is preferred. It's flexible, depending one's need and habit.



thank you for your thoughts, but can you elaborate more on " depends on a particular context"

Hi all
i am newbie in spring MVC.
i want to know which is better way,either to return ModelAndView or just return String with controller?? I have implemented simple login demo with both way and both are working well.

Hello, I am begginer of struts2, i am getting following error while requesting on action

java.lang.NullPointerException
org.apache.struts2.impl.StrutsActionProxy.getErrorMessage(StrutsActionProxy.java:69)
com.opensymphony.xwork2.DefaultActionProxy.prepare(DefaultActionProxy.java:185)
org.apache.struts2.impl.StrutsActionProxy.prepare(StrutsActionProxy.java:63)
org.apache.struts2.impl.StrutsActionProxyFactory.createActionProxy(StrutsActionProxyFactory.java:39)
com.opensymphony.xwork2.DefaultActionProxyFactory.createActionProxy(DefaultActionProxyFactory.java:58)
org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:500)
org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:434)


jsp file

<s:form action="LoginAction" method="post"> <s:textfield name="username" size="30"/> <s:textfield name="password" size="30"/> <s:submit value="Login"/> </s:form>


struts.xml

<struts> <constant name="struts.devMode" value="false" /> <package name="default" extends="struts-default"> <action name="LoginAction" class="com.LoginAction"> <result name="success">/welcome.jsp</result> <result name="fail">/login.jsp</result> </action> </package> </struts>


actionClasss

public class LoginAction extends ActionSupport { private String username; private String password; public String execute() throws Exception { return "success"; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } }

Thank you..

I need to insert a [number of] uiBinder-based widgets into another one, at a particular spot.
lets just say.there is header ,center container and footer uiBinder-based widgets and i want to combine them as home page.
need basic idea..

The init() method is typically used to perform servlet initialization--creating or loading objects that are used by the servlet in the handling of its requests. Why not use a constructor instead? Well, in JDK 1.0 (for which servlets were originally written), constructors for dynamically loaded Java classes (such as servlets) couldn't accept arguments. So, in order to provide a new servlet any information about itself and its environment, a server had to call a servlet's init().

hello,
i am trying to build small app in gwt, i am using DockPanel to set homepage,but issue here is its adding extra space between left menu and center container which i haven't specify.,


have attached image of home screen ..

code of dock panel is as below


homepanel.add(new HomeHeader(), homepanel.NORTH); homepanel.add(new LeftSlidMenu(),homepanel.WEST) ; homepanel.add(new CenterContainer(),homepanel.CENTER); homepanel.add(new Label("hjfsffsf"),homepanel.EAST);

and code of left menu is as below

final HTMLPanel leftslidmenu = new HTMLPanel(""); final Label leftmenuHeader = new Label("Functions"); final Button btnbranch = new Button("Branch"); final Button btncustomer = new Button("Customer"); final Button btnEmployee = new Button("Employee"); final Button btnsalesdesk = new Button("Sales desk"); final Button btnsupplier = new Button("Supplier"); final Button btnuser = new Button("User"); final Button btnsalbranch = new Button("Branch"); final Button btnsalcustomer = new Button("Customer"); final Button btnsalEmployee = new Button("Employee"); final Button btnsalsalesdesk = new Button("Sales desk"); final Button btnsalsupplier = new Button("Supplier"); final Button btnsaluser = new Button("User"); final VerticalPanel setupvertical = new VerticalPanel(); final VerticalPanel salesvertical = new VerticalPanel(); public LeftSlidMenu() { // TODO Auto-generated constructor stub leftslidmenu.setWidth("15em"); leftslidmenu.setHeight("390px"); initstyle(); leftslidmenu.add(leftmenuHeader); /** * tree for leftside menu. */ //buttons for adding data to set with set up tree btnbranch.setWidth("100px"); btncustomer.setWidth("100px"); btnEmployee.setWidth("100px"); btnsalesdesk.setWidth("100px"); btnsupplier.setWidth("100px"); btnuser.setWidth("100px"); btnsalbranch.setWidth("100px"); btnsalcustomer.setWidth("100px"); btnsalEmployee.setWidth("100px"); btnsalsalesdesk.setWidth("100px"); btnsalsupplier.setWidth("100px"); btnsaluser.setWidth("100px"); setupvertical.add(btnbranch); setupvertical.add(btncustomer); setupvertical.add(btnEmployee); setupvertical.add(btnsalesdesk); setupvertical.add(btnsupplier); setupvertical.add(btnuser); salesvertical.add(btnsalbranch); salesvertical.add(btnsalcustomer); salesvertical.add(btnsalEmployee); salesvertical.add(btnsalsalesdesk); salesvertical.add(btnsalsupplier); StackPanel setup = new StackPanel(); setup.setWidth("100%"); setup.add(setupvertical, "Setup", false); setup.add(salesvertical,"Sales", false); setup.add(new Label("Purchase"),"Purchase", false); setup.add(new Label("Stock"),"Stock", false); setup.add(new Label("Reports"),"Reports", false); leftslidmenu.add(leftmenuHeader); leftslidmenu.add(setup); initWidget(leftslidmenu);

try this

http://www.roseindia.net/java/java-security.shtml

hello i am trying to integrate GWT with spring,when ever i run the code it shows following error.

Exception while dispatching incoming RPC call
com.google.gwt.user.server.rpc.UnexpectedException: Service method 'public abstract java.lang.String com.login.client.GreetingService.login(java.lang.String,java.lang.String)' threw an unexpected exception: java.lang.NullPointerException


reetingServiceImpl.java[color=#444444] [/color] @SuppressWarnings("serial") @Service("GreetingService") public class GreetingServiceImpl extends RemoteServiceServlet implements GreetingService { @Autowired private LoginDao logindao; @Override public String login(String username, String password) { // TODO Auto-generated method stub Log.info("USername+++"+username); Log.info("Password+++"+username); Log.info("-------->"+logindao.DomainLogin(username, password)); String returnstring= logindao.DomainLogin(username, password); //ApplicationContext context = WebApplicationContextUtils.getRequiredWebApplicationContext(getServletContext()); //LoginDaoImpl loginimp = (LoginDaoImpl)context.getBean("Logindao"); //return loginimp.DomainLogin(username, password); //logindao.DomainLogin(username, password); return returnstring; } }

LoginDao.java

@Component public interface LoginDao { public String DomainLogin(String username,String password); }

LoginDaoImpl.java
@Component("Logindao") public class LoginDaoImpl implements LoginDao { @Override public String DomainLogin(String username, String password) { // TODO Auto-generated method stub System.out.println(username +"------"+password); if(username.equals("k")&&password.equals("k")) return "Authenticated"; else return "You are not Authorized"; } }

web.xml
<servlet> <servlet-name>greetServlet</servlet-name> <servlet-class>com.login.server.GreetingServiceImpl</servlet-class> </servlet> <!-- for spring--> <context-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/applicationContext.xml</param-value> </context-param> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener>

applicationContext.xml
<context:component-scan base-package="com.login"/> <bean id="GreetingServiceImpl" class="com.login.server.GreetingServiceImpl"></bean>
when ever i use following code

ApplicationContext context = WebApplicationContextUtils.getRequiredWebApplicationContext(getServletContext()); LoginDaoImpl loginimp = (LoginDaoImpl)context.getBean("Logindao");
its working well but i want to use logindao(Autowired) instance to access the method directly to access dao.

Thank you in Advance.