[FIXED] Iterate over List of Map in Thymeleaf

Issue

I have a List that contains a map like this:

Map<String, Long> count = new HashMap<>();
count.put("totalMessageCount", 5L);         
Map<String, Map<String, Long>> names = new HashMap<>();
names.put("someKey", count);
List<Map<String, Map<String, Long>>> list = new ArrayList<>();
list.add(names);

I am sending this list from controller to the View.

I have tried this:

<table>
        <tr th:each="element : ${list}">
        <td th:text="${element.key}"></td>
        <td th:text="${element.value}"></td>
</table>

I get an error:

org.springframework.expression.spel.SpelEvaluationException: EL1008E: Property or field 'key' cannot be found on object of type 'java.util.HashMap' - maybe not public or not valid? at org.springframework.expression.spel.ast.PropertyOrFieldReference.readProperty(PropertyOrFieldReference.java:217) at org.springframework.expression.spel.ast.PropertyOrFieldReference.getValueInternal(PropertyOrFieldReference.java:104) at org.springframework.expression.spel.ast.PropertyOrFieldReference.access$000(PropertyOrFieldReference.java:51) at ...

Any help is appreciated.

Solution

You need another level of nesting, most probably.

<table>
    <th:block th:each="map : ${list}">
       <tr th:each="e : ${map}">
          <td th:text="${e.key}"></td>
          <td th:text="${e.value}"></td>
       </tr>
    </th:block>
</table>

As key and value are properties of a Map.Entry.

Answered By - LppEdd
Answer Checked By - Gilberto Lyons (JavaFixing Admin)