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https://issues.apache.org/jira/browse/SOLR-2571?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13043165#comment-13043165
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Mike Sokolov commented on SOLR-2571:
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sounds like a good case for a config schema
> IndexBasedSpellChecker "thresholdTokenFrequency" fails with a
> ClassCastException on startup
> -------------------------------------------------------------------------------------------
>
> Key: SOLR-2571
> URL: https://issues.apache.org/jira/browse/SOLR-2571
> Project: Solr
> Issue Type: Bug
> Components: spellchecker
> Affects Versions: 1.4.1, 3.1, 4.0
> Reporter: James Dyer
> Priority: Minor
> Labels: whereIsHossManWhenYouNeedHim
> Fix For: 3.3, 4.0
>
> Attachments: SOLR-2571.patch, SOLR-2571.solr3.2.patch
>
>
> When parsing the configuration for thresholdTokenFrequency", the
> IndexBasedSpellChecker tries to pull a Float from the DataConfig.xml-derrived
> NamedList. However, this comes through as a String. Therefore, a
> ClassCastException is always thrown whenever this parameter is specified.
> The code ought to be doing "Float.parseFloat(...)" on the value.
> This looks like a nice feature to use in cases the data contains misspelled
> or rare words leading to spurious "correct" queries. I would have liked to
> have used this with a project we just completed however this bug prevented
> that. This issue came up recently in the User's mailing list so I am raising
> an issue now.
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