ui:repeat doesn't work with Map

Question

I have a Map of key / values, which I initialize in @PostConstruct as follows:

Map myMap;

@PostConstruct
pub         


        

Answer 1

UPDATE: JSF 2.3 (since 2017) supports this out of the box.

Unfortunately, UIData and UIRepeat have no support for iterating over a map in JSF.

If this bothers you (I guess it does), please vote for the following issue and if possible leave a comment that explains how you feel about this:

http://java.net/jira/browse/JAVASERVERFACES_SPEC_PUBLIC-479

In the mean time, you can iterate over a Map with some little helper code:

/**
 * Converts a Map to a List filled with its entries. This is needed since 
 * very few if any JSF iteration components are able to iterate over a map.
 */
public static  List> mapToList(Map map) {

    if (map == null) {
        return null;
    }

    List> list = new ArrayList>();
    list.addAll(map.entrySet());

    return list;
}

Then define an EL function in a *-taglib.xml file like this:

http://example.com/util 


    mapToList
    com.example.SomeClass
    java.util.List mapToList(java.util.Map)

And finally use it on a Facelet like this:

    
        Key = #{entry.key} Value = #{entry.value}