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https://issues.apache.org/jira/browse/ARROW-5120?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17662142#comment-17662142
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Rok Mihevc commented on ARROW-5120:
-----------------------------------
This issue has been migrated to [issue
#21606|https://github.com/apache/arrow/issues/21606] on GitHub. Please see the
[migration documentation|https://github.com/apache/arrow/issues/14542] for
further details.
> [Java] Java library is returning a null pointer exception
> ---------------------------------------------------------
>
> Key: ARROW-5120
> URL: https://issues.apache.org/jira/browse/ARROW-5120
> Project: Apache Arrow
> Issue Type: Bug
> Components: Java
> Affects Versions: 0.12.0
> Reporter: Haowei Yu
> Priority: Major
>
> I am trying to use Java library to write data and read data back again.
> However, I am able to write data successfully but failed on reading the
> schema. Here is the stacktrace:
>
> Exception in thread "main" java.lang.NullPointerException at
> org.apache.arrow.vector.types.pojo.Schema.convertSchema(Schema.java:84) at
> org.apache.arrow.vector.ipc.message.ArrowFooter.<init>(ArrowFooter.java:47)
> at
> org.apache.arrow.vector.ipc.ArrowFileReader.readSchema(ArrowFileReader.java:91)
> at org.apache.arrow.vector.ipc.ArrowReader.initialize(ArrowReader.java:178)
> at
> org.apache.arrow.vector.ipc.ArrowReader.ensureInitialized(ArrowReader.java:169)
> at
> org.apache.arrow.vector.ipc.ArrowReader.getVectorSchemaRoot(ArrowReader.java:62)
> at com.snowflake.ArrowTestRunner.readData(ArrowTestRunner.java:67) at
> com.snowflake.ArrowTestRunner.run(ArrowTestRunner.java:56) at
> com.snowflake.Main.main(Main.java:22) Process finished with exit code 1
>
> Seems that it failed to read footer by using generated flat buffer code.
> I can provide logs if necessary.
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