[SOLR-2571] IndexBasedSpellChecker "thresholdTokenFrequency" fails with a ClassCastException on startup

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 1.4.1, 3.1, 4.0-ALPHA
• Fix Version/s: 3.3, 4.0-ALPHA
• Component/s: spellchecker
• Labels: whereIsHossManWhenYouNeedHim
• Assignee: Robert Muir
• Reporter: James Dyer
• Created: 01/Jun/11 19:39
• Updated: 02/Jul/11 02:43
• Resolved: 07/Jun/11 02:58

Description

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.