fix

Author: nareshwart

src/main/java/com/devopsdemo/tutorial/addressbook/ContactForm.java

@@ -79,6 +79,7 @@ private void cancel() {
         if (isUIAvailable()) {
             Notification.show("Cancelled");
         }
+        setVisible(false);
         if (listener != null) listener.onCancel();
     }
 

src/main/java/com/devopsdemo/utilities/HexAsciiConvertor.java

@@ -45,7 +45,7 @@ public static String asciiToHex(String asciiValue) {
      */
     public static String convertAsciiToHex(String asciiValue) {
         if (asciiValue == null || asciiValue.isEmpty()) {
-            return null;
+            throw new IllegalArgumentException("Hex value cannot be null or empty");
         }
 
         var hex = new StringBuilder();

src/main/java/com/devopsdemo/utilities/LoggerStackTraceUtil.java

@@ -17,6 +17,7 @@ public class LoggerStackTraceUtil {
     public static String getStackTrace(Exception ex) {
         if (ex == null) throw new NullPointerException("Exception cannot be null");
         StringBuilder sb = new StringBuilder();
+        sb.append(ex.toString()).append(System.lineSeparator());
         for (StackTraceElement elem : ex.getStackTrace()) {
             sb.append(elem.toString()).append(System.lineSeparator());
         }

src/main/java/com/devopsdemo/utilities/PropertyLoader.java

@@ -51,7 +51,15 @@ public static Properties loadProperties(String names, ClassLoader loader) {
         boolean loaded = false;
 
         try {
-            if (LOAD_AS_RESOURCE_BUNDLE) {
+            if (names.endsWith(".properties")) {
+                name = name.replace('.', '/');
+                try (InputStream in = loader != null ? loader.getResourceAsStream(name) : null) {
+                    if (in != null) {
+                        result.load(in);
+                        loaded = true;
+                    }
+                }
+            } else if (LOAD_AS_RESOURCE_BUNDLE) {
                 name = name.replace('/', '.');
                 try {
                     ResourceBundle rb = ResourceBundle.getBundle(name, Locale.getDefault(),
@@ -66,7 +74,6 @@ public static Properties loadProperties(String names, ClassLoader loader) {
                 if (!name.endsWith(SUFFIX)) {
                     name = name.concat(SUFFIX);
                 }
-
                 try (InputStream in = loader != null ? loader.getResourceAsStream(name) : null) {
                     if (in != null) {
                         result.load(in);