[BAEL-3524] A Guide to @Serial Annotation in Java 14 (#8433)

* BAEL-1935: Synthetic Class in Java

* Converted tabs to spaces

* [BAEL-3524] Created project core-java-14 with @Serial demo.

core-java-modules/core-java-14/pom.xml

@@ -0,0 +1,52 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<groupId>com.baeldung</groupId>
+	<artifactId>core-java-14</artifactId>
+	<version>1.0.0-SNAPSHOT</version>
+	<name>core-java-14</name>
+	<packaging>jar</packaging>
+	<url>http://maven.apache.org</url>
+
+	<parent>
+		<groupId>com.baeldung</groupId>
+		<artifactId>parent-modules</artifactId>
+		<version>1.0.0-SNAPSHOT</version>
+		<relativePath>../../</relativePath>
+	</parent>
+
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-compiler-plugin</artifactId>
+				<version>${maven-compiler-plugin.version}</version>
+				<configuration>
+					<source>${maven.compiler.source.version}</source>
+					<target>${maven.compiler.target.version}</target>
+					<compilerArgs>
+						<compilerArg>
+							--enable-preview
+						</compilerArg>
+					</compilerArgs>
+				</configuration>
+			</plugin>
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-surefire-plugin</artifactId>
+				<version>3.0.0-M3</version>
+				<configuration>
+					<argLine>--enable-preview</argLine>
+				</configuration>
+			</plugin>
+		</plugins>
+	</build>
+
+	<properties>
+		<maven.compiler.source.version>14</maven.compiler.source.version>
+		<maven.compiler.target.version>14</maven.compiler.target.version>
+	</properties>
+
+</project>

core-java-modules/core-java-14/src/main/java/com/baeldung/serial/MySerialClass.java

@@ -0,0 +1,50 @@
+package com.baeldung.serial;
+
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.io.ObjectStreamException;
+import java.io.ObjectStreamField;
+import java.io.Serial;
+import java.io.Serializable;
+
+/**
+ * Class showcasing the usage of the Java 14 @Serial annotation.
+ * 
+ * @author Donato Rimenti
+ */
+public class MySerialClass implements Serializable {
+	
+	@Serial
+	private static final ObjectStreamField[] serialPersistentFields = null;
+	
+	@Serial
+	private static final long serialVersionUID = 1;
+
+	@Serial
+	private void writeObject(ObjectOutputStream stream) throws IOException {
+		// ...
+	}
+
+	@Serial
+	private void readObject(ObjectInputStream stream) throws IOException, ClassNotFoundException {
+		// ...
+	}
+
+	@Serial
+	private void readObjectNoData() throws ObjectStreamException {
+		// ...
+	}
+
+	@Serial
+	private Object writeReplace() throws ObjectStreamException {
+		// ...
+		return null;
+	}
+
+	@Serial
+	private Object readResolve() throws ObjectStreamException {
+		// ...
+		return null;
+	}
+}