diff --git a/core-java-modules/core-java-jar/src/test/java/com/baeldung/jar/MySampleGUIAppnUnitTest.java b/core-java-modules/core-java-jar/src/test/java/com/baeldung/jar/MySampleGUIAppnUnitTest.java
index ff534b9323..5842a2042c 100644
--- a/core-java-modules/core-java-jar/src/test/java/com/baeldung/jar/MySampleGUIAppnUnitTest.java
+++ b/core-java-modules/core-java-jar/src/test/java/com/baeldung/jar/MySampleGUIAppnUnitTest.java
@@ -8,8 +8,7 @@ class MySampleGUIAppnUnitTest {
 
     @Test
     void testMain() throws IOException {
-        //System.setProperty("java.awt.headless", "true");
-        //System.out.println(java.awt.GraphicsEnvironment.isHeadless());
+        System.setProperty("java.awt.headless", "true");
         MySampleGUIAppn instance = new MySampleGUIAppn();
         String [] args = null;
         System.exit(0);