Change default JSON prefix from "{} && " to ")]}', "

Issue: SPR-13078

spring-webmvc/src/main/java/org/springframework/web/servlet/view/json/MappingJackson2JsonView.java

@@ -99,16 +99,15 @@ public class MappingJackson2JsonView extends AbstractJackson2View {
 	}
 
 	/**
-	 * Indicates whether the JSON output by this view should be prefixed with <tt>"{} && "</tt>.
+	 * Indicates whether the JSON output by this view should be prefixed with <tt>")]}', "</tt>.
 	 * Default is {@code false}.
 	 * <p>Prefixing the JSON string in this manner is used to help prevent JSON Hijacking.
 	 * The prefix renders the string syntactically invalid as a script so that it cannot be hijacked.
-	 * This prefix does not affect the evaluation of JSON, but if JSON validation is performed
-	 * on the string, the prefix would need to be ignored.
+	 * This prefix should be stripped before parsing the string as JSON.
 	 * @see #setJsonPrefix
 	 */
 	public void setPrefixJson(boolean prefixJson) {
-		this.jsonPrefix = (prefixJson ? "{} && " : null);
+		this.jsonPrefix = (prefixJson ? ")]}', " : null);
 	}
 
 	/**