ajust JavaForExecutorBuilder and ForTaskFunction

Author: matheusandre1

experimental/lambda/src/main/java/io/serverlessworkflow/impl/executors/func/JavaForExecutorBuilder.java

@@ -71,8 +71,7 @@ protected WorkflowValueResolver<Collection<?>> buildCollectionFilter() {
   private Object collectionFilterObject(ForTaskFunction taskFunctions) {
     return taskFunctions
         .getForClass()
-        .<Object>map(
-            forClass -> (Object) new TypedFunction(taskFunctions.getCollection(), (Class) forClass))
+        .map(forClass -> new TypedFunction(taskFunctions.getCollection(), forClass))
         .orElse(taskFunctions.getCollection());
   }
 }

experimental/types/src/main/java/io/serverlessworkflow/api/types/func/ForTaskFunction.java

@@ -31,10 +31,6 @@ public class ForTaskFunction extends ForTask {
   private Optional<Class<?>> forClass = Optional.empty();
   private Function<?, Collection<?>> collection;
 
-  public ForTaskFunction() {
-    normalizeOptionalFields();
-  }
-
   public <T, V> ForTaskFunction withWhile(LoopPredicate<T, V> whilePredicate) {
     return withWhile(toPredicate(whilePredicate));
   }
@@ -118,8 +114,8 @@ private <T, V> ForTaskFunction withWhile(
       Optional<Class<?>> modelClass,
       Optional<Class<?>> itemClass) {
     this.whilePredicate = whilePredicate;
-    this.whileClass = modelClass != null ? modelClass : Optional.empty();
-    this.itemClass = itemClass != null ? itemClass : Optional.empty();
+    this.whileClass = modelClass;
+    this.itemClass = itemClass;
     return this;
   }
 
@@ -168,6 +164,7 @@ private void normalizeOptionalFields() {
 
   private void readObject(ObjectInputStream input) throws IOException, ClassNotFoundException {
     input.defaultReadObject();
+    // Preserve compatibility with older serialized instances that may have null optionals.
     normalizeOptionalFields();
   }
 }