Nested foreach with Map does not work properly in Velocity - velocity

Question

I want to generate below code snippet using Velocity.
Map<String, List<String>> fruitsAndTypesMap = new HashMap<String, List<String>>();
String fruit_Apple = "Apple";
List<String> types_Apple = new ArrayList<String>();
types_Apple.add("KA");
types_Apple.add("WA");
fruitsAndTypesMap.put(fruit_Apple, types_Apple);
String fruit_Orange = "Orange";
List<String> types_Orange = new ArrayList<String>();
types_Orange.add("HO");
types_Orange.add("LO");
fruitsAndTypesMap.put(fruit_Orange, types_Orange);
My template_fruits.vm file is as below.
#if ($fruitsMap.size()>0)
Map<String, List<String>> fruitsAndTypesMap = new HashMap<String,List<String>>();
#foreach( $fruitName in $fruitsMap.keySet() )
String fruit_$fruitName = "$fruitName";
List<String> types_$fruitName = new ArrayList<String>();
#foreach( $fruitType in $fruitsMap.get($fruitName) )
types_$fruitName.add("$fruitType.name");
#end
fruitsAndTypesMap.put(fruit_$fruitName, types_$fruitName);
#end
#end
Issue is with the statement: types_$fruitName.add("$fruitType.name");
it does not evaluate the $fruitName properly.
But if i modify the statement to be like: types_($fruitName).add("$fruitType.name");, it is evaluated properly but the value is surrounded with brackets. I dont understand the brackets trick for evaluation.
Below code can be used to load $fruitsMap
public static Map<String, List<Fruit>> getFruitsMap(){
Map<String, List<Fruit>> fruitsMap = new HashMap<String, List<Fruit>>();
List<Fruit> applesList = new ArrayList<Fruit>();
Fruit fruit_Apple = null;
fruit_Apple = new Fruit(); fruit_Apple.setName("KA");
applesList.add(fruit_Apple);
fruit_Apple = new Fruit(); fruit_Apple.setName("WA");
applesList.add(fruit_Apple);
List<Fruit> orangesList = new ArrayList<Fruit>();
Fruit fuit_Orange = null;
fuit_Orange = new Fruit(); fuit_Orange.setName("HO");
orangesList.add(fuit_Orange);
fuit_Orange = new Fruit(); fuit_Orange.setName("LO");
orangesList.add(fuit_Orange);
fruitsMap.put("Apple", applesList);
fruitsMap.put("Orange", orangesList);
return fruitsMap;
}
Code related to template execution:
VelocityEngine velEngine = new VelocityEngine();
velEngine.init();
Template template = velEngine.getTemplate("template_fruits.vm");
VelocityContext context = new VelocityContext();
context.put("fruitsMap", FruitClient.getFruitsMap());
StringWriter writer = new StringWriter();
template.merge(context, writer);
System.out.println("Content: " + writer.toString());
Any hints of what is the wrong with the statement--> types_$fruitName.add("$fruitType.name"); will be helpful.
Thanks

Answer 1

The statement should be:
types_${fruitName}.add("$fruitType.name");
Otherwise, Velocity tries to call an add method on the $fruitName object.