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https://issues.apache.org/jira/browse/ARROW-11788?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17291210#comment-17291210
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Nick Bruno commented on ARROW-11788:
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I can also look at this one and submit a PR for it.
> [Java] Appending Empty List Vector yields NPE
> ---------------------------------------------
>
> Key: ARROW-11788
> URL: https://issues.apache.org/jira/browse/ARROW-11788
> Project: Apache Arrow
> Issue Type: Bug
> Components: Java
> Affects Versions: 3.0.0
> Reporter: Nick Bruno
> Priority: Major
>
> Attempting to append a list vector that is empty to another vector that is
> also empty using VectorAppender raises an NPE. Instead, it should just skip
> processing and do nothing.
> {noformat}
> java.lang.IndexOutOfBoundsException: index: 0, length: 4 (expected: range(0,
> 0))
> at org.apache.arrow.memory.ArrowBuf.checkIndexD(ArrowBuf.java:318)
> at org.apache.arrow.memory.ArrowBuf.chk(ArrowBuf.java:305)
> at org.apache.arrow.memory.ArrowBuf.getInt(ArrowBuf.java:424)
> at org.apache.arrow.vector.util.VectorAppender.visit(VectorAppender.java:195)
> at org.apache.arrow.vector.util.VectorAppender.visit(VectorAppender.java:45)
> at
> org.apache.arrow.vector.complex.ListVector.accept(ListVector.java:449){noformat}
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