Merge pull request #1 from Jacky97s/claude/fix-safety-issues-O6f2h

Author: Jacky97s

core/src/main/java/org/openapitools/openapidiff/core/output/ConsoleRender.java

@@ -358,6 +358,9 @@ public String separator(char ch) {
   }
 
   static int displayWidth(String text) {
+    if (text == null) {
+      return 0;
+    }
     int width = 0;
     for (int i = 0; i < text.length(); i++) {
       char c = text.charAt(i);
@@ -385,6 +388,9 @@ static boolean isFullWidth(char c) {
   }
 
   static String centerCjk(String text, int width) {
+    if (text == null) {
+      text = "";
+    }
     int textWidth = displayWidth(text);
     if (textWidth >= width) {
       return text;

core/src/main/java/org/openapitools/openapidiff/core/output/I18n.java

@@ -11,14 +11,14 @@
 public final class I18n {
 
   private static final String BUNDLE_NAME = "i18n.messages";
-  private static Locale currentLocale = Locale.ENGLISH;
-  private static ResourceBundle bundle = loadBundle(currentLocale);
+  private static volatile Locale currentLocale = Locale.ENGLISH;
+  private static volatile ResourceBundle bundle = loadBundle(currentLocale);
 
   private I18n() {}
 
-  public static void setLocale(Locale locale) {
-    currentLocale = locale;
+  public static synchronized void setLocale(Locale locale) {
     bundle = loadBundle(locale);
+    currentLocale = locale;
   }
 
   public static Locale getLocale() {