emkornfield commented on a change in pull request #7289:
URL: https://github.com/apache/arrow/pull/7289#discussion_r433647053
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File path: java/README.md
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@@ -80,8 +80,12 @@ variable are set, the system property takes precedence.
## Java Properties
-For java 9 or later, should set "-Dio.netty.tryReflectionSetAccessible=true".
+ * For java 9 or later, should set
"-Dio.netty.tryReflectionSetAccessible=true".
This fixes `java.lang.UnsupportedOperationException: sun.misc.Unsafe or
java.nio.DirectByteBuffer.(long, int) not available`. thrown by netty.
+ * To support duplicate fields in a `StructVector` enable
"-Darrow.struct.conflict.policy=CONFLICT_APPEND".
Review comment:
we've been using the policy that java properties should also be settable
via environment variable (I believe in some context environment variables are
easier to set).
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