8342886: Update MET timezone in TimeZoneNames files

src/java.base/share/classes/sun/util/resources/TimeZoneNames.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1996, 2023, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1996, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -929,9 +929,7 @@ protected final Object[][] getContents() {
             {"Japan", JST},
             {"Kwajalein", MHT},
             {"Libya", EET},
-            {"MET", new String[] {"Middle Europe Time", "MET",
-                                  "Middle Europe Summer Time", "MEST",
-                                  "Middle Europe Time", "MET"}},
+            {"MET", CET},
             {"Mexico/BajaNorte", PST},
             {"Mexico/BajaSur", MST},
             {"Mexico/General", CST},

src/jdk.localedata/share/classes/sun/util/resources/ext/TimeZoneNames_de.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2022, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -903,9 +903,7 @@ protected final Object[][] getContents() {
             {"Japan", JST},
             {"Kwajalein", MHT},
             {"Libya", EET},
-            {"MET", new String[] {"Zentraleurop\u00e4ische Zeit", "MET",
-                                  "Zentraleurop\u00e4ische Sommerzeit", "MEST",
-                                  "MET", "MET"}},
+            {"MET", CET},
             {"Mexico/BajaNorte", PST},
             {"Mexico/BajaSur", MST},
             {"Mexico/General", CST},

src/jdk.localedata/share/classes/sun/util/resources/ext/TimeZoneNames_es.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2022, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -903,9 +903,7 @@ protected final Object[][] getContents() {
             {"Japan", JST},
             {"Kwajalein", MHT},
             {"Libya", EET},
-            {"MET", new String[] {"Hora de Europa Central", "MET",
-                                  "Hora de verano de Europa Central", "MEST",
-                                  "MET", "MET"}},
+            {"MET", CET},
             {"Mexico/BajaNorte", PST},
             {"Mexico/BajaSur", MST},
             {"Mexico/General", CST},

src/jdk.localedata/share/classes/sun/util/resources/ext/TimeZoneNames_fr.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2022, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -903,9 +903,7 @@ protected final Object[][] getContents() {
             {"Japan", JST},
             {"Kwajalein", MHT},
             {"Libya", EET},
-            {"MET", new String[] {"Heure de l'Europe centrale", "MET",
-                                  "Heure d'\u00e9t\u00e9 de l'Europe centrale", "MEST",
-                                  "MET", "MET"}},
+            {"MET", CET},
             {"Mexico/BajaNorte", PST},
             {"Mexico/BajaSur", MST},
             {"Mexico/General", CST},

src/jdk.localedata/share/classes/sun/util/resources/ext/TimeZoneNames_it.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2022, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -903,9 +903,7 @@ protected final Object[][] getContents() {
             {"Japan", JST},
             {"Kwajalein", MHT},
             {"Libya", EET},
-            {"MET", new String[] {"Ora dell'Europa centrale", "MET",
-                                  "Ora estiva dell'Europa centrale", "MEST",
-                                  "MET", "MET"}},
+            {"MET", CET},
             {"Mexico/BajaNorte", PST},
             {"Mexico/BajaSur", MST},
             {"Mexico/General", CST},

src/jdk.localedata/share/classes/sun/util/resources/ext/TimeZoneNames_ja.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2022, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -903,9 +903,7 @@ protected final Object[][] getContents() {
             {"Japan", JST},
             {"Kwajalein", MHT},
             {"Libya", EET},
-            {"MET", new String[] {"\u4e2d\u90e8\u30e8\u30fc\u30ed\u30c3\u30d1\u6642\u9593", "MET",
-                                  "\u4e2d\u90e8\u30e8\u30fc\u30ed\u30c3\u30d1\u590f\u6642\u9593", "MEST",
-                                  "MET", "MET"}},
+            {"MET", CET},
             {"Mexico/BajaNorte", PST},
             {"Mexico/BajaSur", MST},
             {"Mexico/General", CST},

src/jdk.localedata/share/classes/sun/util/resources/ext/TimeZoneNames_ko.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2022, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -903,9 +903,7 @@ protected final Object[][] getContents() {
             {"Japan", JST},
             {"Kwajalein", MHT},
             {"Libya", EET},
-            {"MET", new String[] {"\uc911\ubd80 \uc720\ub7fd \uc2dc\uac04", "MET",
-                                  "\uc911\ubd80 \uc720\ub7fd \uc77c\uad11\uc808\uc57d\uc2dc\uac04", "MEST",
-                                  "MET", "MET"}},
+            {"MET", CET},
             {"Mexico/BajaNorte", PST},
             {"Mexico/BajaSur", MST},
             {"Mexico/General", CST},

src/jdk.localedata/share/classes/sun/util/resources/ext/TimeZoneNames_pt_BR.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2022, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -903,9 +903,7 @@ protected final Object[][] getContents() {
             {"Japan", JST},
             {"Kwajalein", MHT},
             {"Libya", EET},
-            {"MET", new String[] {"Fuso hor\u00e1rio da Europa M\u00e9dia", "MET",
-                                  "Fuso hor\u00e1rio de ver\u00e3o da Europa M\u00e9dia", "MEST",
-                                  "MET", "MET"}},
+            {"MET", CET},
             {"Mexico/BajaNorte", PST},
             {"Mexico/BajaSur", MST},
             {"Mexico/General", CST},

src/jdk.localedata/share/classes/sun/util/resources/ext/TimeZoneNames_sv.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2022, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -903,9 +903,7 @@ protected final Object[][] getContents() {
             {"Japan", JST},
             {"Kwajalein", MHT},
             {"Libya", EET},
-            {"MET", new String[] {"Mellaneuropeisk tid", "MET",
-                                  "Mellaneuropeisk sommartid", "MEST",
-                                  "MET", "MET"}},
+            {"MET", CET},
             {"Mexico/BajaNorte", PST},
             {"Mexico/BajaSur", MST},
             {"Mexico/General", CST},

src/jdk.localedata/share/classes/sun/util/resources/ext/TimeZoneNames_zh_CN.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2022, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -903,9 +903,7 @@ protected final Object[][] getContents() {
             {"Japan", JST},
             {"Kwajalein", MHT},
             {"Libya", EET},
-            {"MET", new String[] {"\u4e2d\u6b27\u65f6\u95f4", "MET",
-                                  "\u4e2d\u6b27\u590f\u4ee4\u65f6", "MEST",
-                                  "MET", "MET"}},
+            {"MET", CET},
             {"Mexico/BajaNorte", PST},
             {"Mexico/BajaSur", MST},
             {"Mexico/General", CST},

src/jdk.localedata/share/classes/sun/util/resources/ext/TimeZoneNames_zh_TW.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2022, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -905,9 +905,7 @@ protected final Object[][] getContents() {
             {"Japan", JST},
             {"Kwajalein", MHT},
             {"Libya", EET},
-            {"MET", new String[] {"\u4e2d\u6b50\u6642\u9593", "MET",
-                                  "\u4e2d\u6b50\u590f\u4ee4\u6642\u9593", "MEST",
-                                  "MET", "MET"}},
+            {"MET", CET},
             {"Mexico/BajaNorte", PST},
             {"Mexico/BajaSur", MST},
             {"Mexico/General", CST},

test/jdk/sun/util/resources/TimeZone/Bug4848242.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2007, 2024, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2007, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -23,9 +23,12 @@
 
 /*
  *@test
- *@bug 4848242
- *@summary Make sure that MET time zone is not misinterpreted in euro locales.
- *         Display the MET and MEST TZ human-readable name in all euro locales.
+ *@bug 4848242 8342886
+ *@summary Verifies that sampled European locales use consistent short time zone names.
+ *         Originally assumed all European locales had the same short names,
+ *         but due to changes in time zone data and locale handling, that is no longer guaranteed.
+ *         This test now verifies that a representative sample of locales (e.g., fr, it)
+ *         still use the same short names (CET/CEST).
  */
 
 import java.util.Locale;