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https://issues.apache.org/jira/browse/SOLR-5088?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13724241#comment-13724241
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Pavel Yaskevich commented on SOLR-5088:
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Thanks for the tip [~mkhludnev], putting a handler into war file did help, I'm
resolving the ticket. Confirmed that I was doing it wrong :)
> ClassCastException is thrown when trying to use custom SearchHandler.
> ---------------------------------------------------------------------
>
> Key: SOLR-5088
> URL: https://issues.apache.org/jira/browse/SOLR-5088
> Project: Solr
> Issue Type: Bug
> Affects Versions: 4.4
> Reporter: Pavel Yaskevich
>
> Hi guys,
> I'm trying to replace solr.SearchHandler to custom one in solrconfig.xml
> for one of the stores, and it's throwing following exception:
> {noformat}
> Caused by: org.apache.solr.common.SolrException: RequestHandler init failure
> at
> org.apache.solr.core.RequestHandlers.initHandlersFromConfig(RequestHandlers.java:167)
> at org.apache.solr.core.SolrCore.<init>(SolrCore.java:772)
> ... 13 more
> Caused by: org.apache.solr.common.SolrException: Error Instantiating Request
> Handler, org.my.solr.index.CustomSearchHandler failed to instantiate
> org.apache.solr.request.SolrRequestHandler
> at org.apache.solr.core.SolrCore.createInstance(SolrCore.java:551)
> at org.apache.solr.core.SolrCore.createRequestHandler(SolrCore.java:603)
> at
> org.apache.solr.core.RequestHandlers.initHandlersFromConfig(RequestHandlers.java:153)
> ... 14 more
> Caused by: java.lang.ClassCastException: class
> org.my.solr.index.CustomSearchHandler
> at java.lang.Class.asSubclass(Class.java:3116)
> at
> org.apache.solr.core.SolrResourceLoader.findClass(SolrResourceLoader.java:433)
> at
> org.apache.solr.core.SolrResourceLoader.findClass(SolrResourceLoader.java:381)
> at org.apache.solr.core.SolrCore.createInstance(SolrCore.java:530)
> ... 16 more
> {noformat}
> I actually tried extending SearchHandler, and implementing SolrRequestHandler
> as well as extending RequestHandlerBase and it's all the same
> ClassCastException result...
> org.my.solr.index.CustomSearchHandler is definitely in class path and
> recompiled every retry.
> Maybe I'm doing something terribly wrong?
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