src/java.base/share/classes/sun/security/ssl/HelloExtensions.java

@@ -83,10 +83,12 @@
             } else if (extType == ExtensionType.EXT_EC_POINT_FORMATS) {
                 extension =
                         new SupportedEllipticPointFormatsExtension(s, extlen);
             } else if (extType == ExtensionType.EXT_RENEGOTIATION_INFO) {
                 extension = new RenegotiationInfoExtension(s, extlen);
+            } else if (extType == ExtensionType.EXT_MAX_FRAGMENT_LENGTH) {
+                extension = new MaxFragmentLengthExtension(s, extlen);
             } else {
                 extension = new UnknownExtension(s, extlen, extType);
             }
             extensions.add(extension);
             len -= extlen + 4;