eugenp · maibin · Aug 27, 2025 · Aug 21, 2025 · Aug 21, 2025
diff --git a/...ules/core-java-reflection-3/src/main/java/com/baeldung/reflectionbeans/BeanUtilsDemo.java b/...ules/core-java-reflection-3/src/main/java/com/baeldung/reflectionbeans/BeanUtilsDemo.java
@@ -9,21 +9,22 @@ public class BeanUtilsDemo {
     public static void main(String[] args) throws Exception {
         Post post = new Post();
         BeanUtils.setProperty(post, "title", "Commons BeanUtils Rocks");
-        String title = BeanUtils.getProperty(post, "title");
-
-        Map<String, Object> data = Map.of(
-                "title", "Map → Bean",
-                "author", "Baeldung Team"
-        );
 
+        Map<String, Object> data = Map.of("title", "Map → Bean", "author", "Baeldung Team");
         BeanUtils.populate(post, data);
         Post source = new Post();
         source.setTitle("Source");
         source.setAuthor("Alice");
 
         Post target = new Post();
         BeanUtils.copyProperties(target, source);
-        System.out.println(title);
+        if (target.getMetadata() == null) {
+            target.setMetadata(new Post.Metadata());
+        }
+        BeanUtils.setProperty(target, "metadata.wordCount", 850);
+        System.out.println(target.getTitle());
+        System.out.println(target.getMetadata()
+            .getWordCount());
     }
 
     public static void safeCopy(Object target, Object source) {

diff --git a/...-java-modules/core-java-reflection-3/src/main/java/com/baeldung/reflectionbeans/Post.java b/...-java-modules/core-java-reflection-3/src/main/java/com/baeldung/reflectionbeans/Post.java
@@ -4,10 +4,42 @@ public class Post {
 
     private String title;
     private String author;
+    private Metadata metadata;
 
-    public String getTitle() { return title; }
-    public void setTitle(String title) { this.title = title; }
+    public String getTitle() {
+        return title;
+    }
 
-    public String getAuthor() { return author; }
-    public void setAuthor(String author) { this.author = author; }
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public String getAuthor() {
+        return author;
+    }
+
+    public void setAuthor(String author) {
+        this.author = author;
+    }
+
+    public Metadata getMetadata() {
+        return metadata;
+    }
+
+    public void setMetadata(Metadata metadata) {
+        this.metadata = metadata;
+    }
+
+    public static class Metadata {
+
+        private int wordCount;
+
+        public int getWordCount() {
+            return wordCount;
+        }
+
+        public void setWordCount(int wordCount) {
+            this.wordCount = wordCount;
+        }
+    }
 }
diff --git a/...-java-reflection-3/src/main/java/com/baeldung/reflectionbeans/PropertyDescriptorDemo.java b/...-java-reflection-3/src/main/java/com/baeldung/reflectionbeans/PropertyDescriptorDemo.java
@@ -20,10 +20,12 @@ public static void main(String[] args) throws Exception {
         Method write = titlePd.getWriteMethod();
         Method read = titlePd.getReadMethod();
 
-
-        write.invoke(post, "Reflections in Java");
-        String value = (String) read.invoke(post);
-
-        System.out.println(value);
+        if (write != null) {
+            write.invoke(post, "Reflections in Java");
+        }
+        if (read != null) {
+            String value = (String) read.invoke(post);
+            System.out.println(value);
+        }
     }
 }
diff --git a/...a-reflection-3/src/test/java/com/baeldung/reflectionbeans/PropertyDescriptorUnitTest.java b/...a-reflection-3/src/test/java/com/baeldung/reflectionbeans/PropertyDescriptorUnitTest.java
@@ -13,7 +13,9 @@ public void givenPost_whenUsingPropertyDescriptor_thenReadAndWrite() throws Exce
         Post post = new Post();
         PropertyDescriptor pd = new PropertyDescriptor("author", Post.class);
 
-        pd.getWriteMethod().invoke(post, "Chris");
-        assertEquals("Chris", pd.getReadMethod().invoke(post));
+        pd.getWriteMethod()
+            .invoke(post, "Chris");
+        assertEquals("Chris", pd.getReadMethod()
+            .invoke(post));
     }
 }