[jira] [Created] (ARROW-5120) Java library is returning a null pointer exception

["Haowei Yu (JIRA)" <ji...@apache.org>]

Haowei Yu created ARROW-5120:
--------------------------------

             Summary: 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


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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