How to access Map key in jsf datatable

java, jsf, jsf-2, primefaces

Solution

Until the upcoming JSF 2.2, the `<h:dataTable>`/`<p:dataTable>` doesn't support `Collection<E>`. It only supports among others `List<E>`.

You need to replace

public Collection<Properties> getProperties() throws Exception{
    return properties.values();
}

by

private List<Properties> propertiesAsList;

public List<Properties> getProperties() throws Exception{
    return propertiesAsList;
}

and somewhere directly after map's initialization do this

propertiesAsList = new ArrayList<Properties>(properties.values());

(note: don't do it inside the getter!)

Problem

I'm getting the error `javax.el.PropertyNotFoundException: /member/apps/cms/edit.xhtml @228,49 value="#{props.key}": Property 'key' not found on type java.util.HashMap$Values` when trying to display the datatable below. ``` <p:dataTable id="properties" var="props" value="#{contentEditorBacking.properties}" editable="true"> <p:column headerText="Property"> <p:cellEditor> <f:facet name="output"> <h:outputText value="#{props.key}" /> </f:facet> <f:facet name="input"> <h:inputText value="#{props.key}" /> </f:facet> </p:cellEditor> </p:column> <p:column headerText="Value"> <p:cellEditor> <f:facet name="output"> <h:outputText value="#{props.value}" /> </f:facet> <f:facet name="input"> <h:inputText value="#{props.value}" /> </f:facet> </p:cellEditor> </p:column> <p:column headerText="Edit"> <p:rowEditor /> <!-- Need to put an update on here yet --> <p:commandLink styleClass="ui-icon ui-icon-trash" id="deleteProperty" actionListener="#{contentEditorBacking.deleteProperty}"> <f:attribute name="key" value="#{props.key}" /> </p:commandLink> </p:column> </p:dataTable> ``` Here's the relevant part of my contentEditorBacking: ``` @ManagedBean @ViewScoped public class ContentEditorBacking { private Map<String, Properties> properties = new LinkedHashMap<String, Properties>(); public Collection<Properties> getProperties() throws Exception{ return properties.values(); } public static class Properties{ private String key; private String value; public Properties(String key, String value) { super(); this.key = key; this.value = value; } public String getKey() { return key; } public void setKey(String key) { this.key = key; } public String getValue() { return value; } public void setValue(String value) { this.value = value; } @Override public String toString() { return "key=" + key + ", value=" + value + ""; } } } ``` How can i access the key value from my properties map?

Original source