I have a ManagedBean of a treeNode and other managed bean where i would like to get the selectedNode and from getType i would like to execute some code but the problem i can't get the selectedNode cause every time i get this:
java.lang.NullPointerException: javax.faces.FacesException: #{dimMan.makeDim()}: java.lang.NullPointerException
and this is my two Managed bean:
#ManagedBean
#ViewScoped
public class TreeBean implements Serializable {
private static final long serialVersionUID = 2417620239014385855L;
private TreeNode root;
private TreeNode selectedNode;
.....
and the other one where i would like to make a test of the type of selected node:
#ManagedBean(name = "dimMan")
#SessionScoped
public class DimenssionManaged {
#EJB
DimensionDaoRemote dimService;
#Inject
TreeBean treeSelected;
String select;
public TreeBean getTreeSelected() {
return treeSelected;
}
public void setTreeSelected(TreeBean treeSelected) {
this.treeSelected = treeSelected;
}
public void makeDim(){
System.out.println("adding dimen");
fkey=tTable.getSelectedFk();
dimUpdate.setFk_dimension(fkey);
dimUpdate.setType_dimension(selectedType);
select=treeSelected.getSelectedNode().getParent().getType();
System.out.println(select);
if (select=="cube"){
CubeBase cub=cubManged.getCubUpdate();
dimUpdate.setCube(cub);
dimService.creat_dimension(dimUpdate);
}
else {
SchemaBase sh=shmanged.getSchema();
dimUpdate.setSchema(sh);
dimService.creat_dimension(dimUpdate);
}
}
i try also to use this annotation #ManagedProperty(value =***) but it didn't work to so what should i do to get the selectedNode type from in other ManagedBean ?
DimenssionManaged ManagedBean associated with other page? If so once you navigate TreeBean will loose its data since its in #ViewScoped.
Change TreeBean to #SessionScoped to retain the the data even after navigation, but clearing/refreshing the data again is a concern.
Related
I read the other posts about this subject but I still can't get it to work
This are my beans:
Bean1:
#ManagedBean()
#SessionScoped
public class Bean1 implements Serializable {
//Here are some important Properties
public String buttonPressed() {
return "bean2.xhtml";
}
}
<h:form>
<p:commandButton action="#{Bean1.buttonPressed}" value="Do Work"/>
</h:form>
Bean2:
#ManagedBean()
#SessionScoped
public class Bean2 implements Serializable {
#ManagedProperty(value = "#{Bean1}")
private Bean1 b1;
//getter/setter is here
public String doWorkOnSubmit() {
//Access important Properties from bean1
b1.getFoo()
}
}
Now I have two Problems
1.) How to call "doWorkOnSubmit" if the button in Bean1 is pressed? I can't use the constructor because it's SessionScoped and I don't know how to call doWorkOnSubmit un submit
2.)The managed property "b1" is sometimes null
Since on clicking of Do Work button you are calling Bean1.buttonPressed() action method you can call Bean2s doWorkOnSubmit() by injecting Bean2 in Bean1.
Here is your code altered:
#ManagedBean()
#SessionScoped
public class Bean1 implements Serializable {
//Here are some important Properties
/*
* Inject Bean2 here. since both beans are session scoped,
* there ain't gonna be any problem in injection.
*/
#ManagedProperty(value = "#{Bean2}")
private Bean2 b2;
//GETTER SETTER for b2
public String buttonPressed() {
//Here you will be invoking injected managed beans method.
b2.doWorkOnSubmit();
return "bean2.xhtml";
}
}
I try to achieve resource injection for a long time but couldn't succeeded.
I use JSF 2.2, JDK 1.7. And my ide is eclipse luna.
I have a session scoped bean called UserBean and view scoped bean called SettingsBean.
I set them in faces-config.xml UserBean as session scoped and SettingsBean as view scoped with their bean name "settingsBean" and "userBean"
public class SettingsBean implements Serializable {
private static final long serialVersionUID = 1L;
#Inject // I also tried #ManagedProperty but didn't work
private UserBean userBean;
#PostConstruct
public void init(){
System.out.println(userBean.getUser().getFullName());
}
public UserBean getUserBean() {
return userBean;
}
public void setUserBean(UserBean userBean) {
this.userBean = userBean;
}
}
The problem is I get userBean as null. What is the problem here?
Thanks for help.
I removed ManagedBean and ViewScoped definitions in faces-config.xml for settingsBean and added them in SettingsBean.java file manually.
And added this also:
#ManagedProperty(value="#{userBean}")
private UserBean userBean;
So finally, it works:
#ManagedBean
#ViewScoped
public class SettingsBean implements Serializable{
private static final long serialVersionUID = 1L;
#ManagedProperty(value="#{userBean}")
private UserBean userBean;
//...
#PostConstruct
public void init(){
System.out.println(userBean.getUser().getFullName());
}
public UserBean getUserBean() {
return userBean;
}
public void setUserBean(UserBean userBean) {
this.userBean = userBean;
}
}
I have this SessionScoped bean:
#ManagedBean
#SessionScoped
public class LoginBean implements Serializable {
/**
* Creates a new instance of LoginBean
*/
public LoginBean() {
this.usuario = new Usuario();
}
private Usuario usuario;
//getter & setter
}
The Usuario class:
public class Usuario {
public Usuario() {
}
private String password;
private String nombre;
private int idPlanta;
private int nivel;
private String idUsuario;
//getters & setters
}
And I want to get the value of the property idPlanta from the SessionScoped bean (LoginBean) here (in the constructor) see the comments:
#ManagedBean
#ViewScoped
public class PrincipalBean implements Serializable {
public PrincipalBean() {
System.out.println(this.login.getUsuario().getIdPlanta());
//AT THIS POINT THE VALUE OF idPlanta IS 0 but in the session I have 1...
//Method that uses the idPlanta value as a parameter
}
#ManagedProperty(value = "#{loginBean}")
private LoginBean login;
public LoginBean getLogin() {
return login;
}
public void setLogin(LoginBean login) {
this.login = login;
}
}
But when I show the value in the view it shows the value that really is in the Session idPlanta = 1. I dont understand why I cant get the value of that property in the constructor of that ViewScoped bean (PrincipalBean). I show the value in the view here(I know I can get it directly fron the LoginBean but this is just to show that the property login in PrincipalBean has the Session value):
<h:outputText class="titulo" value="Bienvenido(a) #{principalBean.login.usuario.nombre} Planta #{principalBean.login.usuario.idPlanta}" />
The value of idPlanta in PrincipalBean is very important because I use it as a method parameter to show more info when the view is showed.
Please help me. I still learning JSF.
You need to be using these values after the bean has been constructed. When your constructor is called, your bean has net yet been initialzed - therefore the injections have not yet happend. Using the #PostConstruct method you will be able to access the desired values from the injected objects.
For example :
#ManagedBean
#ViewScoped
public class PrincipalBean implements Serializable {
public PrincipalBean() {
}
#PostConstruct
public init() {
System.out.println(this.login.getUsuario().getIdPlanta());
//AT THIS POINT THE VALUE OF idPlanta IS 0 but in the session I have 1...
//Method that uses the idPlanta value as a parameter
}
#ManagedProperty(value = "#{loginBean}")
private LoginBean login;
public LoginBean getLogin() {
return login;
}
public void setLogin(LoginBean login) {
this.login = login;
}
}
See Also
Why use #PostConstruct?
Injecting Managed Beans In JSF 2.0
JSF injection with managed property, good pattern?
I have a JSF web application with a view-scoped bean and a session-scoped bean. I'd like to modify the session bean's members from the view bean, and I followed this guide from a certain well-known JSF guy, but I can't seem to get it to work without a runtime exception. The reference to the managed session bean, "home" is null when referenced, similar to this question except I've already followed the advice of the accepted answer.
package brian.canadaShipping;
import java.io.Serializable;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.ManagedProperty;
import javax.faces.bean.ViewScoped;
#ManagedBean(name= "requestBean")
#ViewScoped
public class CpstcRequestBean implements Serializable {
#ManagedProperty(value="#{home}")
private CpstcHomeBean homeBean;
public CpstcHomeBean getHomeBean() {
return homeBean;
}
public void setHomeBean(CpstcHomeBean homeBean) {
this.homeBean = homeBean;
}
private static final long serialVersionUID = -5066913533772933899L;
public String testVar = "hello world";
private boolean displayOutput = false;
public boolean isDisplayOutput() {
return displayOutput;
}
public void setDisplayOutput(boolean displayOutput) {
this.displayOutput = displayOutput;
}
public String getTestVar() {
return testVar;
}
public void setTestVar(String testVar) {
this.testVar = testVar;
}
public CpstcRequestBean()
{
System.out.println("TEST: " + homeBean.toString());
System.out.println("Hello, ResuestBean!");
}
}
The first bit of my "home" bean is as follows:
#ManagedBean(name= "home")
#SessionScoped
public class CpstcHomeBean implements Serializable {
...
UPDATE: I've followed Jordan's suggestions and I have the following in my view-scoped bean:
#ManagedBean(name= "requestBean")
#ViewScoped
public class CpstcRequestBean implements Serializable {
#Inject #Named("home") CpstcHomeBean homeBean;
public CpstcHomeBean getHomeBean() {
return homeBean;
}
public void setHomeBean(CpstcHomeBean homeBean) {
this.homeBean = homeBean;
}
public CpstcRequestBean()
{
System.out.println("TEST: " + homeBean.toString());
System.out.println("Hello, ResuestBean!");
}
...
as well as this in my session-scoped bean:
#Named("home")
#SessionScoped
public class CpstcHomeBean implements Serializable {
...
yet my "home" bean reference is still null. Any ideas?
UPDATE 2: It turns out that you must use #Named in both classes, not just the injected class. My web app now loads but some elements are blank. In my console log, I see, "Target Unreachable, identifier 'home' resolved to null." I'm running on Tomcat 7, if that affects things. Any ideas?
You can either change your session bean's #ManagedBean to #Named and then just inject it into your view scoped bean OR you can reference the session bean as is like this:
FacesContext fc = FacesContext.getCurrentInstance()
private CpstcHomeBean homeBean = (CpstcHomeBean) fc.getApplication().evaluateExpressionGet(fc, "#{home}", CpstcHomeBean.class);
I searched similar questions but I'm a bit confused. I have a login page, so LoginBean also which is;
#ManagedBean(name = "loginBean")
#SessionScoped
public class LoginBean implements Serializable {
private String password="";
private String image="";
#ManagedProperty(value = "#{loginBeanIdentityNr}")
private String identityNr="";
...
after success, navigates to orderlist page, so I have also OrderBean.
#ManagedBean(name = "OrderBean")
#SessionScoped
public class OrderBean {
List<Ordery> sdList;
public List<Order> getSdList() {
try {
String identityNr ="";
ELContext elContext = FacesContext.getCurrentInstance().getELContext();
LoginBean lBean = (LoginBean) FacesContext.getCurrentInstance().getApplication().getELResolver().getValue(elContext, null, "loginBean");
identityNr =lBean.getIdentityNr();
sdList = DatabaseUtil.getOrderByIdentityNr(identityNr);
...
}
I don't need the whole LoginBean, just ManagedProperty "loginBeanIdentityNr". But this code below doesn't work (of course);
identityNr = (String) FacesContext.getCurrentInstance()
.getApplication().getELResolver()
.getValue(elContext, null, "loginBeanIdentityNr");
this time it returns null to me.
I think if I need whole bean property, I can inject these beans, right? So, do you have any suggestions for this approach? can<f:attribute> be used?
The #ManagedProperty declares the location where JSF should set the property, not where JSF should "export" the property. You need to just inject the LoginBean as property of OrderBean.
public class OrderBean {
#ManagedProperty(value="#{loginBean}")
private LoginBean loginBean; // +setter
// ...
}
This way you can access it in the OrderBean by just
loginBean.getIdentityNr();
Alternatively, if you make your OrderBean request or view scoped, then you can also set only the identityNr property.
public class OrderBean {
#ManagedProperty(value="#{loginBean.identityNr}")
private String identityNr; // +setter
// ...
}
Unrelated to the concrete problem: initializing String properties with an empty string is a poor practice.