jbonofre commented on code in PR #3333:
URL: https://github.com/apache/avro/pull/3333#discussion_r2008663165


##########
lang/java/avro/src/main/java/org/apache/avro/specific/SpecificDatumReader.java:
##########
@@ -37,8 +37,19 @@ public class SpecificDatumReader<T> extends 
GenericDatumReader<T> {
   public static final String[] SERIALIZABLE_PACKAGES;
 
   static {
-    SERIALIZABLE_PACKAGES = 
System.getProperty("org.apache.avro.SERIALIZABLE_PACKAGES",
-        
"java.lang,java.math,java.io,java.net,org.apache.avro.reflect").split(",");
+    String defaultPackages = 
"java.lang,java.math,java.io,java.net,org.apache.avro.reflect";
+
+    String userDefinedPackages = 
System.getProperty("org.apache.avro.SERIALIZABLE_PACKAGES", "");

Review Comment:
   Why not simply returning `defaultPackages` in default value of 
`System.getProperty()` ?
   
   If the user defines his own value, maybe it would be surprising to always 
add `defaultPackages`.
   
   Mabye more "logic" to have `defaultPackages` by default, but not if the user 
defines his own packages.



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