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https://issues.apache.org/jira/browse/SOLR-2983?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13187741#comment-13187741
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Simon Willnauer commented on SOLR-2983:
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honestly expecting IW in the ctor is bogus. IndexWriter passes itself to the
mergePolicy in MergePolicy#setIndexWriter() and we should really keep it that
way. the fix here is to not give the option to pass IW to the MP in the ctor.
> Unable to load custom MergePolicy
> ---------------------------------
>
> Key: SOLR-2983
> URL: https://issues.apache.org/jira/browse/SOLR-2983
> Project: Solr
> Issue Type: Bug
> Reporter: Mathias Herberts
> Priority: Critical
> Fix For: 3.6, 4.0
>
>
> As part of a recent upgrade to Solr 3.5.0 we encountered an error related to
> our use of LinkedIn's ZoieMergePolicy.
> It seems the code that loads a custom MergePolicy was at some point moved
> into SolrIndexConfig.java from SolrIndexWriter.java, but as this code was
> copied verbatim it now contains a bug:
> try {
> policy = (MergePolicy)
> schema.getResourceLoader().newInstance(mpClassName, null, new
> Class[]{IndexWriter.class}, new Object[]{this});
> } catch (Exception e) {
> policy = (MergePolicy)
> schema.getResourceLoader().newInstance(mpClassName);
> }
> 'this' is no longer an IndexWriter but a SolrIndexConfig, therefore the call
> to newInstance will always throw an exception and the catch clause will be
> executed. If the custom MergePolicy does not have a default constructor
> (which is the case of ZoieMergePolicy), the second attempt to create the
> MergePolicy will also fail and Solr won't start.
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