BAEL-8822 - introduction to objenesis

Author: SmartyAnsh

libraries-5/pom.xml

@@ -198,6 +198,11 @@
             <artifactId>jline-terminal-jansi</artifactId>
             <version>${jline.version}</version>
         </dependency>
+        <dependency>
+            <groupId>org.objenesis</groupId>
+            <artifactId>objenesis</artifactId>
+            <version>${objenesis.version}</version>
+        </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-test</artifactId>
@@ -220,6 +225,7 @@
         <sootup.version>1.3.0</sootup.version>
         <resilience4j.version>2.1.0</resilience4j.version>
         <jline.version>3.28.0</jline.version>
+        <objenesis.version>3.4</objenesis.version>
     </properties>
 
 </project>

libraries-5/src/main/java/com/baeldung/objenesis/User.java

@@ -0,0 +1,21 @@
+package com.baeldung.objenesis;
+
+import java.io.Serializable;
+
+public class User implements Serializable {
+
+    private String name;
+
+    public User() {
+        throw new RuntimeException("User constructor should not be called!");
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+}
+

libraries-5/src/test/java/com/baeldung/objenesis/ObjenesisTest.java

@@ -0,0 +1,52 @@
+package com.baeldung.objenesis;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
+import org.junit.jupiter.api.Test;
+import org.objenesis.Objenesis;
+import org.objenesis.ObjenesisHelper;
+import org.objenesis.ObjenesisSerializer;
+import org.objenesis.ObjenesisStd;
+
+public class ObjenesisTest {
+
+    @Test
+    void givenObjenesisStd_whenCreatingUser_thenObjectIsCreatedWithoutConstructor() {
+        Objenesis objenesis = new ObjenesisStd();
+        User user = objenesis.newInstance(User.class);
+        assertNotNull(user);
+
+        user.setName("Harry Potter");
+        assertEquals("Harry Potter", user.getName());
+    }
+
+    @Test
+    void givenObjenesisSerializer_whenCreatingUser_thenObjectIsCreatedWithoutConstructor() {
+        Objenesis objenesis = new ObjenesisSerializer();
+        User user = objenesis.newInstance(User.class);
+        assertNotNull(user);
+
+        user.setName("Harry Potter");
+        assertEquals("Harry Potter", user.getName());
+    }
+
+    @Test
+    void givenObjenesisHelper_whenCreatingUser_thenObjectIsCreatedWithoutConstructor() {
+        User user = ObjenesisHelper.newInstance(User.class);
+        assertNotNull(user);
+
+        user.setName("Harry Potter");
+        assertEquals("Harry Potter", user.getName());
+    }
+
+    @Test
+    void givenObjenesisHelper_whenCreatingSerializableUser_thenObjectIsCreatedWithoutConstructor() {
+        User user = ObjenesisHelper.newSerializableInstance(User.class);
+        assertNotNull(user);
+
+        user.setName("Harry Potter");
+        assertEquals("Harry Potter", user.getName());
+    }
+
+}