Disallow ValueExpression on var property

jakartaee/faces#1559

impl/src/main/java/jakarta/faces/component/UISelectItems.java

@@ -16,6 +16,7 @@
 
 package jakarta.faces.component;
 
+import jakarta.el.ValueExpression;
 import jakarta.faces.model.SelectItem;
 
 /**
@@ -75,6 +76,27 @@ public UISelectItems() {
 
     }
 
+    // ---------------------------------------------------------------- Bindings
+
+    /**
+     * <p class="changed_added_4_0">
+     * Set the {@link ValueExpression} used to calculate the value for the specified attribute or property name, if any.
+     * In addition, if a {@link ValueExpression} is set for the <code>var</code> property, regardless of the value, throw an illegal argument exception.
+     * </p>
+     *
+     * @throws IllegalArgumentException If <code>name</code> is one of <code>id</code>, <code>parent</code>, or <code>var</code>.
+     * @throws NullPointerException {@inheritDoc}
+     */
+    @Override
+    public void setValueExpression(String name, ValueExpression binding) {
+
+        if ("var".equals(name)) {
+            throw new IllegalArgumentException();
+        }
+
+        super.setValueExpression(name, binding);
+    }
+
     // -------------------------------------------------------------- Properties
 
     @Override