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https://issues.apache.org/jira/browse/SOLR-5088?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13723503#comment-13723503
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Mikhail Khludnev commented on SOLR-5088:
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Hello,
Can you tell how you run that code? I'm concerned by java thread pool in the
bottom of the stack trace.
I'd suggest you setup exception breakpoint and evaluate classloaders for your
class, and its' ascendent. Pay attention to the parent and url fields. Post
your observations here.
> 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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