java.lang.NullPointerException: Argument Error: Parameter id is null

Question

I am reading a Java EE 7 book "Java EE 7 Recipes" by Josh Juneau. I am trying to run some sample code from chapter 3 (Recipe 3.5 ) to test the conditional navigation. The code is very simple and straightforward but unfortunately I am getting very odd behavior. JSF Page script is given below: ``` Login Test

Login

``` and the JSF Managed Bean: ``` package com.test.controller; import javax.faces.bean.ManagedBean; import javax.faces.bean.RequestScoped; @ManagedBean @RequestScoped public class LoginTest { private boolean authenticated; public LoginTest() { authentic…

Accepted Answer

I reproduced it. It's a bug in Mojarra which has the same grounds as issue 3054 which I already reported earlier. If there's no flow document ID in the navigation case, the `NavigationCase#getToFlowDocumentId()` returns an empty string, never `null`, yet the code is performing only a null check.

I've reported this bug as issue 3087. The fix shall hopefully be in 2.2.5. In the meanwhile, your best bet is forgetting navigation cases and using implicit navigation. Edit the login method as follows:

```
public String login() {
    setAuthenticated(true);
    return "/faces/page.xhtml?faces-redirect=true";
}
```

And get rid of that navigation case.

java.lang.NullPointerException: Argument Error: Parameter id is null

Solution

Problem