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From "Scott Carey (JIRA)" <j...@apache.org>
Subject [jira] Commented: (AVRO-387) hashCode throws a NullPointerException when unions are uninitialized
Date Mon, 01 Feb 2010 19:50:19 GMT

    [ https://issues.apache.org/jira/browse/AVRO-387?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12828246#action_12828246

Scott Carey commented on AVRO-387:

Perhaps a longer term solution to this is making toString() not depend on hashCode().  AvroSpecific
objects can define their own toString methods.

In fact, in all my use cases of the SpecificAPI so far I avoided these issues by writing my
own toString() methods on the wrappers -- it was important for debugging to be able to print
object state whether the object conformed to the schema or not.  Finding bugs where data is
incorrectly set is much easier with a "safe" toString() that is never expected to fail.

hashCode() should probably never fail either, but changes there are more dangerous since it
needs to be carefully kept consistent with equals().

> hashCode throws a NullPointerException when unions are uninitialized
> --------------------------------------------------------------------
>                 Key: AVRO-387
>                 URL: https://issues.apache.org/jira/browse/AVRO-387
>             Project: Avro
>          Issue Type: Bug
>          Components: java
>    Affects Versions: 1.2.0
>            Reporter: Michael Armbrust
>            Priority: Minor
>         Attachments: AVRO-387.patch, AVRO-387.patch.txt
> This is a very similar issue to AVRO-382, except this time it happens for uninitialized
unions instead of primitive fields.  Once again, this makes it very difficult to use avro
from the scala console.
> Stacktrace:
> {noformat}
> org.apache.avro.AvroRuntimeException: Not in union [{"type":"record","name":"GetRequest","namespace":"edu.berkeley.cs.scads.comm","fields":[{"name":"namespace","type":"string"},{"name":"key","type":"bytes"}]}]:
> 	at org.apache.avro.generic.GenericData.resolveUnion(GenericData.java:339)
> 	at org.apache.avro.generic.GenericData.hashCode(GenericData.java:429)
> 	at org.apache.avro.specific.SpecificData.hashCode(SpecificData.java:227)
> 	at org.apache.avro.generic.GenericData.hashCodeAdd(GenericData.java:439)
> 	at org.apache.avro.specific.SpecificData.hashCode(SpecificData.java:223)
> 	at org.apache.avro.specific.SpecificRecordBase.hashCode(SpecificRecordBase.java:52)
> 	at java.lang.Object.toString(Object.java:219)
> 	at scala.runtime.ScalaRunTime$.stringOf(ScalaRunTime.scala:165)
> 	at RequestResult$.<init>(<console>:4)
> 	at RequestResult$.<clinit>(<console>)
> 	at RequestResult$result(<console>)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> 	at java.lang.reflect.Method.invoke(Method.java:597)
> 	at scala.tools.nsc.Interpreter$Request.loadAndRun(Interpreter.scala:889)
> 	at scala.tools.nsc.Interpreter.interpret(Interpreter.scala:508)
> 	at scala.tools.nsc.InterpreterLoop.interpretStartingWith(InterpreterLoop.scala:242)
> 	at scala.tools.nsc.InterpreterLoop.command(InterpreterLoop.scala:230)
> 	at scala.tools.nsc.InterpreterLoop.repl(InterpreterLoop.scala:142)
> 	at scala.tools.nsc.InterpreterLoop.main(InterpreterLoop.scala:298)
> 	at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:141)
> 	at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)
> {noformat}

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