diff --git a/core-java/src/main/java/com/baeldung/jar/JarExample.java b/core-java/src/main/java/com/baeldung/jar/JarExample.java
index 262df3a5ec..daa44025d5 100644
--- a/core-java/src/main/java/com/baeldung/jar/JarExample.java
+++ b/core-java/src/main/java/com/baeldung/jar/JarExample.java
@@ -7,8 +7,8 @@ public class JarExample {
     private static final String DIMENSION_FILE = "/dimensions.txt";
 
     public static void main(String[] args) {
-        String environment = System.getProperty("environment");
-        if (environment != null && environment.equalsIgnoreCase("prod")) {
+        String inputType = System.getProperty("input");
+        if (inputType != null && inputType.equalsIgnoreCase("file")) {
             Dimensioner dimensioner = new Dimensioner();
             try {
                 List<Rectangle> rectangles = dimensioner.loadFromFile(DIMENSION_FILE);