BAEL-871 What is serialVersionUID? (#2203)

* Bean Injection in Spring – ashrafmsokkar@gmail.com * Bean Injection in Spring – ashrafmsokkar@gmail.com * BAEL-871: What is serialVersionUID? * BAEL-871: What is serialVersionUID? * BAEL-871 What is serialVersionUID? * BAEL-871 Implemented feedback
2017-07-06 23:45:03 -07:00
parent f3c99a7fcf
commit 5a184d4e0d
5 changed files with 150 additions and 1 deletions
--- a/core-java/src/test/java/com/baeldung/deserialization/DeserializationUnitTest.java
+++ b/core-java/src/test/java/com/baeldung/deserialization/DeserializationUnitTest.java
@@ -0,0 +1,67 @@
+package com.baeldung.deserialization;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotEquals;
+import static org.junit.Assert.assertTrue;
+
+import java.io.IOException;
+import java.io.InvalidClassException;
+
+import org.junit.Ignore;
+import org.junit.Test;
+
+public class DeserializationUnitTest {
+
+    private static final String serializedObj = "rO0ABXNyACljb20uYmFlbGR1bmcuZGVzZXJpYWxpemF0aW9uLkFwcGxlUHJvZHVjdAAAAAAAEtaHAgADTAANaGVhZHBob25lUG9ydHQAEkxqYXZhL2xhbmcvU3RyaW5nO0wADmxpZ2h0ZW5pbmdQb3J0cQB+AAFMAA90aHVuZGVyYm9sdFBvcnRxAH4AAXhwdAARaGVhZHBob25lUG9ydDIwMjBwdAATdGh1bmRlcmJvbHRQb3J0MjAyMA==";
+
+    private static long userDefinedSerialVersionUID = 1234567L;
+
+    /**
+     * Tests the deserialization of the original "AppleProduct" (no exceptions are thrown)
+     * @throws ClassNotFoundException
+     * @throws IOException
+     */
+    @Test
+    public void testDeserializeObj_compatible() throws IOException, ClassNotFoundException {
+
+        assertEquals(userDefinedSerialVersionUID, AppleProduct.getSerialVersionUID());
+        
+        AppleProduct macBook = new AppleProduct();
+        macBook.headphonePort = "headphonePort2020";
+        macBook.thunderboltPort = "thunderboltPort2020";
+        
+        // serializes the "AppleProduct" object
+        String serializedProduct = SerializationUtility.serializeObjectToString(macBook);
+
+        // deserializes the "AppleProduct" object
+        AppleProduct deserializedProduct = (AppleProduct) DeserializationUtility.deSerializeObjectFromString(serializedProduct);
+     
+        assertTrue(deserializedProduct.headphonePort.equalsIgnoreCase(macBook.headphonePort));
+        assertTrue(deserializedProduct.thunderboltPort.equalsIgnoreCase(macBook.thunderboltPort));
+    
+    }
+
+    /**
+     * Tests the deserialization of the modified (non-compatible) "AppleProduct".
+     * The test should result in an InvalidClassException being thrown.
+     * 
+     * Note: to run this test: 
+     *          1. Modify the value of the serialVersionUID identifier in AppleProduct.java
+     *          2. Remove the @Ignore annotation
+     *          3. Run the test individually (do not run the entire set of tests)
+     *          4. Revert the changes made in 1 & 2 (so that you're able to re-run the tests successfully)
+     *          
+     * @throws ClassNotFoundException
+     * @throws IOException
+     */
+    @Ignore
+    @Test(expected = InvalidClassException.class)
+    public void testDeserializeObj_incompatible() throws ClassNotFoundException, IOException {
+
+        assertNotEquals(userDefinedSerialVersionUID, AppleProduct.getSerialVersionUID());
+        
+        // attempts to deserialize the "AppleProduct" object
+        DeserializationUtility.deSerializeObjectFromString(serializedObj);
+    }
+
+}