garydgregory commented on code in PR #480:
URL: https://github.com/apache/commons-compress/pull/480#discussion_r1485214180


##########
src/main/java/org/apache/commons/compress/archivers/zip/ExtraFieldUtils.java:
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@@ -113,24 +116,24 @@ public ZipExtraField onUnparseableExtraField(final byte[] 
data, final int off, f
     /**
      * Static registry of known extra fields.
      */
-    private static final Map<ZipShort, Class<?>> IMPLEMENTATIONS;
+    private static final Map<ZipShort, Supplier<ZipExtraField>> 
IMPLEMENTATIONS;
 
     static {
-        IMPLEMENTATIONS = new ConcurrentHashMap<>();
-        register(AsiExtraField.class);
-        register(X5455_ExtendedTimestamp.class);
-        register(X7875_NewUnix.class);
-        register(JarMarker.class);
-        register(UnicodePathExtraField.class);
-        register(UnicodeCommentExtraField.class);
-        register(Zip64ExtendedInformationExtraField.class);
-        register(X000A_NTFS.class);
-        register(X0014_X509Certificates.class);
-        register(X0015_CertificateIdForFile.class);
-        register(X0016_CertificateIdForCentralDirectory.class);
-        register(X0017_StrongEncryptionHeader.class);
-        register(X0019_EncryptionRecipientCertificateList.class);
-        register(ResourceAlignmentExtraField.class);
+        IMPLEMENTATIONS = new HashMap<>(); // it can't be used at runtime by 
design so no need to be concurrent

Review Comment:
   The method `register(Class)` is a public API, so anyone can call it at any 
time, I don't see the need to change the Map implementation, better safe than 
sorry ;-)



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