[jira] [Resolved] (SOLR-5108) plugin loading should fail if mor then one instance of a singleton plugin is found

["Hoss Man (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SOLR-5108?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hoss Man resolved SOLR-5108.
----------------------------

       Resolution: Fixed
    Fix Version/s: 5.0
                   4.5
    
> plugin loading should fail if mor then one instance of a singleton plugin is found
> ----------------------------------------------------------------------------------
>
>                 Key: SOLR-5108
>                 URL: https://issues.apache.org/jira/browse/SOLR-5108
>             Project: Solr
>          Issue Type: Bug
>            Reporter: Hoss Man
>            Assignee: Hoss Man
>             Fix For: 4.5, 5.0
>
>         Attachments: SOLR-5108.patch
>
>
> Continuing from the config parsing/validation work done in SOLR-4953, we should improve SolrConfig so that parsing fails if multiple instances of a "plugin" are found for types of plugins where only one is allowed to be used at a time.
> at the moment, {{SolrConfig.loadPluginInfo}} happily initializes a {{List<PluginInfo>}} for whatever xpath it's given, and then later code can either call {{List<PluginInfo> getPluginInfos(String)}} or {{PluginInfo getPluginInfo(String)}} (the later just being shorthand for getting the first item in the list.
> we could make {{getPluginInfo(String)}} throw an error if the list has multiple items, but i think we should also change the signature of {{loadPluginInfo}} to be explicit about how many instances we expect to find, so we can error earlier, and have a redundant check.

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