8342550: Log warning for using JDK1.1 compatible time zone IDs for future removal

Reviewed-by: jlu, joehw, iris

src/java.base/share/classes/java/util/TimeZone.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1996, 2024, 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
@@ -46,6 +46,7 @@ import jdk.internal.util.StaticProperty;
 import sun.util.calendar.ZoneInfo;
 import sun.util.calendar.ZoneInfoFile;
 import sun.util.locale.provider.TimeZoneNameUtility;
+import sun.util.logging.PlatformLogger;
 
 /**
  * {@code TimeZone} represents a time zone offset, and also figures out daylight
@@ -596,6 +597,11 @@ public abstract class TimeZone implements Serializable, Cloneable {
     }
 
     private static TimeZone getTimeZone(String ID, boolean fallback) {
+        if (ZoneId.SHORT_IDS.containsKey(ID)) {
+            PlatformLogger.getLogger(TimeZone.class.getName())
+                .warning("Use of the three-letter time zone ID \"%s\" is deprecated and it will be removed in a future release"
+                    .formatted(ID));
+        }
         TimeZone tz = ZoneInfo.getTimeZone(ID);
         if (tz == null) {
             tz = parseCustomTimeZone(ID);

src/java.base/share/classes/sun/util/cldr/CLDRTimeZoneNameProviderImpl.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018, 2024, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2018, 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
@@ -35,7 +35,8 @@ import java.util.Locale;
 import java.util.Objects;
 import java.util.ResourceBundle;
 import java.util.Set;
-import java.util.TimeZone;
+
+import sun.util.calendar.ZoneInfo;
 import sun.util.calendar.ZoneInfoFile;
 import sun.util.locale.provider.LocaleProviderAdapter;
 import sun.util.locale.provider.LocaleResources;
@@ -93,7 +94,7 @@ public class CLDRTimeZoneNameProviderImpl extends TimeZoneNameProviderImpl {
                 case "":
                     // Fill in empty elements
                     deriveFallbackName(namesSuper, i, locale,
-                                       TimeZone.getTimeZone(id).toZoneId().getRules().isFixedOffset());
+                                       ZoneInfo.getTimeZone(id).toZoneId().getRules().isFixedOffset());
                     break;
                 case NO_INHERITANCE_MARKER:
                     // CLDR's "no inheritance marker"
@@ -131,7 +132,7 @@ public class CLDRTimeZoneNameProviderImpl extends TimeZoneNameProviderImpl {
 
     // Derive fallback time zone name according to LDML's logic
     private void deriveFallbackNames(String[] names, Locale locale) {
-        boolean noDST = TimeZone.getTimeZone(names[0]).toZoneId().getRules().isFixedOffset();
+        boolean noDST = ZoneInfo.getTimeZone(names[0]).toZoneId().getRules().isFixedOffset();
 
         for (int i = INDEX_STD_LONG; i <= INDEX_GEN_SHORT; i++) {
             deriveFallbackName(names, i, locale, noDST);

test/jdk/java/util/TimeZone/ThreeLetterZoneID.java

@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 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
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @bug 8342550
+ * @summary Three-letter time zone IDs should output a deprecated warning
+ *          message.
+ * @library /test/lib
+ * @build jdk.test.lib.process.ProcessTools
+ * @run main ThreeLetterZoneID
+ */
+import java.util.TimeZone;
+import jdk.test.lib.process.ProcessTools;
+
+public class ThreeLetterZoneID {
+    public static void main(String... args) throws Exception {
+        if (args.length > 0) {
+            TimeZone.getTimeZone("PST");
+        } else {
+            checkWarningMessage();
+        }
+    }
+
+    public static void checkWarningMessage() throws Exception {
+        ProcessTools.executeTestJava("ThreeLetterZoneID", "dummy")
+            .shouldContain("Use of the three-letter time zone ID \"PST\" is deprecated and it will be removed in a future release");
+    }
+}