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From "Earwin Burrfoot (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1748) getPayloadSpans on org.apache.lucene.search.spans.SpanQuery should be abstract
Date Thu, 16 Jul 2009 13:38:14 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1748?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12731939#action_12731939
] 

Earwin Burrfoot commented on LUCENE-1748:
-----------------------------------------

bq. Shouldnt it throw a runtime exception (unsupported operation?) or something?
What is the difference between adding an abstract method and adding a method that throws exception
in regards to jar drop in back compat?
In both cases when you drop your new jar in you get an exception, except in the latter case
exception is deferred.

> getPayloadSpans on org.apache.lucene.search.spans.SpanQuery should be abstract
> ------------------------------------------------------------------------------
>
>                 Key: LUCENE-1748
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1748
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Query/Scoring
>    Affects Versions: 2.4, 2.4.1
>         Environment: all
>            Reporter: Hugh Cayless
>             Fix For: 2.4.2
>
>
> I just spent a long time tracking down a bug resulting from upgrading to Lucene 2.4.1
on a project that implements some SpanQuerys of its own and was written against 2.3.  Since
the project's SpanQuerys didn't implement getPayloadSpans, the call to that method went to
SpanQuery.getPayloadSpans which returned null and caused a NullPointerException in the Lucene
code, far away from the actual source of the problem.  
> It would be much better for this kind of thing to show up at compile time, I think.
> Thanks!

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