--- old/make/jdk/src/classes/build/tools/cldrconverter/CLDRConverter.java	2019-07-05 06:56:29.943459433 +0100
+++ new/make/jdk/src/classes/build/tools/cldrconverter/CLDRConverter.java	2019-07-05 06:56:29.803459433 +0100
@@ -108,7 +108,7 @@
     private static final ResourceBundle.Control defCon =
         ResourceBundle.Control.getControl(ResourceBundle.Control.FORMAT_DEFAULT);
 
-    private static final String[] AVAILABLE_TZIDS = TimeZone.getAvailableIDs();
+    private static Set<String> AVAILABLE_TZIDS;
     private static String zoneNameTempFile;
     private static String tzDataDir;
     private static final Map<String, String> canonicalTZMap = new HashMap<>();
@@ -730,7 +730,7 @@
             });
         }
 
-        Arrays.stream(AVAILABLE_TZIDS).forEach(tzid -> {
+        getAvailableZoneIds().stream().forEach(tzid -> {
             // If the tzid is deprecated, get the data for the replacement id
             String tzKey = Optional.ofNullable((String)handlerSupplMeta.get(tzid))
                                    .orElse(tzid);
@@ -1074,8 +1074,20 @@
             StandardOpenOption.CREATE, StandardOpenOption.TRUNCATE_EXISTING);
     }
 
+    // This method assumes handlerMetaZones is already initialized
+    private static Set<String> getAvailableZoneIds() {
+        assert handlerMetaZones != null;
+        if (AVAILABLE_TZIDS == null) {
+            AVAILABLE_TZIDS = new HashSet(ZoneId.getAvailableZoneIds());
+            AVAILABLE_TZIDS.addAll(handlerMetaZones.keySet());
+            AVAILABLE_TZIDS.remove(MetaZonesParseHandler.NO_METAZONE_KEY);
+        }
+
+        return AVAILABLE_TZIDS;
+    }
+
     private static Stream<String> zidMapEntry() {
-        return ZoneId.getAvailableZoneIds().stream()
+        return getAvailableZoneIds().stream()
                 .map(id -> {
                     String canonId = canonicalTZMap.getOrDefault(id, id);
                     String meta = handlerMetaZones.get(canonId);