Haowei Yu created ARROW-5120:
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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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