Added String to ArrayList not shown / not updated [duplicate] - jsf

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Closed 5 years ago.
...So i've got my #ApplicationScoped Bean "Application"..:
#ManagedBean(name = "Application")
#ApplicationScoped
public class Application implements Serializable {
private boolean isRunning = false;
private ArrayList<Feed> sentNotifications = new ArrayList<>();
private ArrayList<String> emails = new ArrayList<>(
Arrays.asList("f00#b4r.com", "test#test.com")
);
private LinkedList<String> words = new LinkedList<>(
Arrays.asList("vuln","banana","pizza","bonanza")
);
private LinkedList<String> feeds = new LinkedList<>(
Arrays.asList("http://www.kb.cert.org/vulfeed",
"https://ics-cert.us-cert.gov/advisories/advisories.xml",
"https://ics-cert.us-cert.gov/alerts/alerts.xml")
);
...and want to add a String to ArrayList<String> emails using the method:
public String addEmail(String email) {
emails.add(email);
return null;
}
The Facelet goes as follows:
<!-- EMAILS -->
<h3>Configured Emails</h3>
<h:form>
<h:inputText value="Email" var="email"/>
<h:commandButton value="Add Email" action="#{Application.addEmail(email)}"/>
</h:form>
<h:form>
<ui:repeat var="email" value="#{Application.emails}">
<tr>
<td>#{email}</td>
<td>
<f:facet name="header">Action</f:facet>
<h:commandLink value="Delete" action="#{Application.rmEmail(email)}"/>
</td>
</tr>
<br></br>
</ui:repeat>
</h:form>
...so when i try to add "blabla#bla.com", this is the Result:
There is a delete-button shown, but not the String itself?!
Is the String correctly added - and JSF doesnt rerender the view..?
..Or is the String not added correctly?
please help!
thanks.

Answer 1

I fixed it, finally!
Thanks to User #Kukeltje, who hinted me at basic things that i got wrong - and User #Wietlol who motivated me in the chat through moral support and 'believes in me' :)
The solution:
..in Application.java:
public List<Feed> sentNotifications = new ArrayList<>();
public List<String> emails = new ArrayList<>();
public List<String> words = new LinkedList<>(Arrays.asList("vuln", "banana", "pizza", "bonanza"));
public List<String> feeds = new LinkedList<>(
Arrays.asList("http://www.kb.cert.org/vulfeed",
"https://ics-cert.us-cert.gov/advisories/advisories.xml",
"https://ics-cert.us-cert.gov/alerts/alerts.xml")
);
private String currentEmail;
private String currentFeed;
private String currentWord;
[...]
public void addEmail() {
emails.add(currentEmail);
}
..and gui.xhmtl:
<!-- EMAILS -->
<h3>Configured Emails</h3>
<h:form>
<h:inputText value="#{Application.currentEmail}" var="email"/>
<h:commandButton value="Add Email" action="#{Application.addEmail}"/>
</h:form>
<h:form>
<ui:repeat var="email" value="#{Application.emails}">
<tr>
<td>#{email}</td>
<td>
<f:facet name="header">Action</f:facet>
<h:commandLink value="Delete" action="#{Application.rmEmail(email)}"/>
</td>
</tr>
<br></br>
</ui:repeat>
</h:form>
Notice how action="#{Application.addEmail}" does not make use of arguments- rather the parameter is handed to the method via value="#{Application.currentEmail}".
If you, reader, have the same problem please consider these points:
getter/setter for each Field in the bean
primitive fields!
argument-less methods to 'delegate' the primitive Fields, e.g. my addEmail method
Hope this answer is usefull to ppl having the same issue!
Greetings,
Gewure