XStream- Object to Xml

Closing Review comments, test cases added.

xstream-introduction/src/main/java/com/baeldung/initializer/SimpleXstreamInitializer.java

@@ -0,0 +1,19 @@
+package com.baeldung.initializer;
+
+import com.thoughtworks.xstream.XStream;
+
+public class SimpleXstreamInitializer {
+
+	private static XStream xstreamInstance;
+
+	public static XStream getXstreamInstance() {
+		if (xstreamInstance == null) {
+			synchronized (SimpleXstreamInitializer.class) {
+				if (xstreamInstance == null) {
+					xstreamInstance = new XStream();
+				}
+			}
+		}
+		return xstreamInstance;
+	}
+}