Feature/bael 968 (#2154)

* Merging BAEL-968: Apache Commons BeanUtils

* BAEL-968: Updated code for copyProperties example

* BAEL-968: Updated code based on reviewer comments

* BAEL-968: Fixed merge issue

libraries/src/main/java/com/baeldung/commons/beanutils/CourseEntity.java

@@ -0,0 +1,35 @@
+package com.baeldung.commons.beanutils;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+public class CourseEntity {
+    private String name;
+    private List<String> codes;
+    private Map<String, Student> students = new HashMap<String, Student>();
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public List<String> getCodes() {
+        return codes;
+    }
+
+    public void setCodes(List<String> codes) {
+        this.codes = codes;
+    }
+    
+    public void setStudent(String id, Student student) {
+        students.put(id, student);
+    }
+
+    public Student getStudent(String enrolledId) {
+        return students.get(enrolledId);
+    }
+}

libraries/src/main/java/com/baeldung/commons/beanutils/CourseService.java

@@ -3,32 +3,38 @@ package com.baeldung.commons.beanutils;
 import java.lang.reflect.InvocationTargetException;
 import java.util.List;
 
+import org.apache.commons.beanutils.BeanUtils;
 import org.apache.commons.beanutils.PropertyUtils;
 
 public class CourseService {
 
     public static void setValues(Course course, String name, List<String> codes) 
-            throws IllegalAccessException, InvocationTargetException, NoSuchMethodException {
+        throws IllegalAccessException, InvocationTargetException, NoSuchMethodException {
         // Setting the simple properties
         PropertyUtils.setSimpleProperty(course, "name", name);
         PropertyUtils.setSimpleProperty(course, "codes", codes);
     }
     
     public static void setIndexedValue(Course course, int codeIndex, String code)
-            throws IllegalAccessException, InvocationTargetException, NoSuchMethodException {
+        throws IllegalAccessException, InvocationTargetException, NoSuchMethodException {
         // Setting the indexed properties
         PropertyUtils.setIndexedProperty(course, "codes[" + codeIndex + "]", code);
     }
 
     public static void setMappedValue(Course course, String enrollId, Student student)
-            throws IllegalAccessException, InvocationTargetException, NoSuchMethodException {
+        throws IllegalAccessException, InvocationTargetException, NoSuchMethodException {
         // Setting the mapped properties
         PropertyUtils.setMappedProperty(course, "enrolledStudent(" + enrollId + ")", student);
     }
     
     public static String getNestedValue(Course course, String enrollId, String nestedPropertyName)
-            throws IllegalAccessException, InvocationTargetException, NoSuchMethodException {
+        throws IllegalAccessException, InvocationTargetException, NoSuchMethodException {
         return (String) PropertyUtils.getNestedProperty(
                  course, "enrolledStudent(" + enrollId + ")." + nestedPropertyName);
     }
+    
+    public static void copyProperties(Course course, CourseEntity courseEntity) 
+        throws IllegalAccessException, InvocationTargetException {
+        BeanUtils.copyProperties(course, courseEntity);
+    }
 }

libraries/src/test/java/com/baeldung/commons/beanutils/CourseServiceTest.java

@@ -8,31 +8,46 @@ import org.junit.Assert;
 import org.junit.Test;
 
 public class CourseServiceTest {
-    
+
     @Test
     public void givenCourse_whenSetValuesUsingPropertyUtil_thenReturnSetValues() 
-            throws IllegalAccessException, InvocationTargetException, NoSuchMethodException {
+        throws IllegalAccessException, InvocationTargetException, NoSuchMethodException {
         Course course = new Course();
         String name = "Computer Science";
         List<String> codes = Arrays.asList("CS", "CS01");
         CourseService.setValues(course, name, codes);
-        
+
         Assert.assertEquals(name, course.getName());
         Assert.assertEquals(2, course.getCodes().size());
         Assert.assertEquals("CS", course.getCodes().get(0));
-        
+
         CourseService.setIndexedValue(course, 1, "CS02");
         Assert.assertEquals("CS02", course.getCodes().get(1));
-        
+
         Student student = new Student();
         String studentName = "Joe";
         student.setName(studentName);
-        
+
         CourseService.setMappedValue(course, "ST-1", student);
         Assert.assertEquals(student, course.getEnrolledStudent("ST-1"));
-        
+
         String accessedStudentName = CourseService.getNestedValue(course, "ST-1", "name");
         Assert.assertEquals(studentName, accessedStudentName);
     }
 
+    @Test
+    public void givenCopyProperties_whenCopyCourseToCourseEntity_thenCopyPropertyWithSameName()
+        throws IllegalAccessException, InvocationTargetException, NoSuchMethodException {
+        Course course = new Course();
+        course.setName("Computer Science");
+        course.setCodes(Arrays.asList("CS"));
+        course.setEnrolledStudent("ST-1", new Student());
+
+        CourseEntity courseEntity = new CourseEntity();
+
+        CourseService.copyProperties(course, courseEntity);
+        Assert.assertEquals(course.getName(), courseEntity.getName());
+        Assert.assertEquals(course.getCodes(), courseEntity.getCodes());
+        Assert.assertNull(courseEntity.getStudent("ST-1"));
+    }
 }